WO2016043328A1 - 電気化学素子、固体酸化物形燃料電池セル、およびこれらの製造方法 - Google Patents
電気化学素子、固体酸化物形燃料電池セル、およびこれらの製造方法 Download PDFInfo
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- WO2016043328A1 WO2016043328A1 PCT/JP2015/076790 JP2015076790W WO2016043328A1 WO 2016043328 A1 WO2016043328 A1 WO 2016043328A1 JP 2015076790 W JP2015076790 W JP 2015076790W WO 2016043328 A1 WO2016043328 A1 WO 2016043328A1
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Images
Classifications
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- H01M8/10—Fuel cells with solid electrolytes
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- H01M8/1213—Fuel cells with solid electrolytes operating at high temperature, e.g. with stabilised ZrO2 electrolyte characterised by the electrode/electrolyte combination or the supporting material
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- H01M8/1213—Fuel cells with solid electrolytes operating at high temperature, e.g. with stabilised ZrO2 electrolyte characterised by the electrode/electrolyte combination or the supporting material
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- H01M8/1246—Fuel cells with solid electrolytes operating at high temperature, e.g. with stabilised ZrO2 electrolyte characterised by the process of manufacturing or by the material of the electrolyte the electrolyte consisting of oxides
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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Definitions
- the present invention relates to an electrochemical element having a metal substrate, an electrode layer, and an electrolyte layer, a solid oxide fuel cell, and a method for producing them.
- SOFC electrolyte-supported solid oxide fuel cell
- electrode-supported SOFC in order to obtain a dense and highly airtight electrolyte layer, a high temperature (for example, 1400 ° C.) is used. Firing is performed.
- a metal-supported SOFC in which a fuel electrode, an air electrode, and an electrolyte layer are supported on a metal plate has been developed in order to reduce the thickness and improve the robustness.
- Patent Document 1 discloses a metal-supported SOFC in which a thin-film fuel electrode, an electrolyte, and an air electrode are laminated in this order on a porous metal substrate.
- an electrolyte material is applied and dried on the fuel electrode, and then pressed. Thereafter, sintering is performed to form a dense electrolyte.
- SOFC solid oxide electrolytic cell
- SOEC solid oxide electrolytic cell
- an oxygen sensor using a solid oxide have the same basic structure. That is, an electrochemical element having a metal substrate, an electrode layer, and an electrolyte layer is used for SOFC, SOEC, and oxygen sensor. And the above-mentioned subject exists in common with the above-mentioned electrochemical element, SOFC, SOEC, and an oxygen sensor.
- the present invention has been made in view of the above-mentioned problems, and its purpose is to provide a robustness with a good electrode layer capable of laminating a dense electrolyte layer while keeping the treatment temperature during formation of the electrolyte layer low.
- An excellent electrochemical device, solid oxide fuel cell, and production method thereof are provided.
- the electrochemical element according to the present invention includes a metal substrate having a plurality of through holes, an electrode layer provided on a surface on the front side of the metal substrate, and an electrode layer on the electrode layer.
- An electrochemical element having an electrolyte layer provided, wherein the through hole is provided through a surface on the front side and a surface on the back side of the metal substrate, and the electrode layer includes the through hole in the metal substrate.
- the electrolyte layer is provided in a region wider than the provided region, and the electrolyte layer has a first portion that covers the electrode layer and a second portion that contacts the surface on the front side of the metal substrate.
- the electrolyte layer since the electrolyte layer has the first portion that covers the electrode layer and the second portion that contacts the surface on the front side of the metal substrate, the electrolyte layer wraps the electrode layer.
- the electrolyte layer can be made difficult to peel off.
- the electrolyte layer can be bonded to the metal substrate by the second portion, so that the electrochemical device as a whole has excellent robustness. Further, gas leakage from the electrode layer can be suppressed in the second portion. To explain, when the electrochemical element is operated, gas is supplied from the back side of the metal substrate to the electrode layer through the through hole.
- the end portion of the electrode layer is exposed at a portion where the second portion does not exist at the end portion of the electrode layer, it is conceivable that a gas leak occurs from there. If the end portion of the electrode layer is securely covered by the second portion, gas leakage can be suppressed without providing another member such as a gasket.
- the electrode layer has an insertion portion that is inserted into the through hole and closes the through hole.
- the electrode layer since the electrode layer has the insertion portion that is inserted into the through hole and closes the through hole, the strength of the bond between the electrode layer and the metal substrate can be further increased. That is, it is possible to realize an electrochemical element with more robustness.
- Another characteristic configuration of the electrochemical device according to the present invention is that the electrode layer has higher strength in the upper part adjacent to the electrolyte layer than in the lower part adjacent to the metal substrate.
- the strength of the upper part adjacent to the electrolyte layer is high, so that the bonding strength between the electrode layer and the electrolyte layer can be further increased.
- a technique that may give an impact to the underlying electrode layer such as a thermal spraying method (spray coating method) or an aerosol deposition method, can be used.
- a dense electrolyte layer can be formed by a treatment at a low temperature, and the durability of the electrochemical element can be expected to be improved by not performing the treatment at a high temperature.
- Another characteristic configuration of the electrochemical device according to the present invention is that the electrode layer has a higher density in the upper part adjacent to the electrolyte layer than in the lower part adjacent to the metal substrate.
- the bonding strength between the electrode layer and the electrolyte layer can be further increased due to the high density of the upper portion adjacent to the electrolyte layer.
- the density of the electrolyte layer can also be improved.
- gas permeability is required for the electrode layer of the electrochemical element, but the gas permeability decreases as the density increases. Therefore, with the above-described characteristic configuration, the lower part has a lower density than the upper part to ensure gas permeability, while the upper part has a higher density than the lower part, and the bonding strength between the electrode layer and the electrolyte layer. And the density of the electrolyte layer formed on the electrode layer can be improved.
- the electrode layer is a cermet material
- the electrode layer has the cermet in an upper portion adjacent to the electrolyte layer compared to a lower portion adjacent to the metal substrate.
- the content ratio of the aggregate of the material is high.
- the content ratio of the aggregate of the cermet material is high in the upper portion adjacent to the electrolyte layer, so that the strength and density of the upper portion can be increased, and the electrode layer and the electrolyte layer are joined. It is possible to improve the strength, lower the conditions for forming the electrolyte layer, and ensure the gas permeability of the electrode layer. Therefore, the robustness and durability of the electrochemical element can be further increased.
- the metal substrate is made of a ferritic stainless material.
- the metal substrate is a ferritic stainless steel material
- the metal substrate can be made excellent in heat resistance and corrosion resistance, and the durability and reliability of the electrochemical element can be improved. Can do.
- the thermal expansion coefficient is close to, for example, YSZ (yttrium-stabilized zirconia), GDC (gadolinium-doped ceria), etc., which are materials of the electrode layer and the electrolyte layer. Therefore, even when the temperature cycle of low temperature and high temperature is repeated, it is difficult to break. Therefore, an electrochemical element excellent in long-term durability can be manufactured.
- Another characteristic configuration of the electrochemical device according to the present invention is that the electrolyte layer contains zirconia-based ceramics.
- the electrolyte layer contains zirconia-based ceramics, a high-performance electrochemical element that can be used in a high temperature range of about 650 ° C. or more can be realized.
- the electrochemical element according to the present invention includes a metal substrate having a plurality of through holes, an electrode layer provided on a surface on the front side of the metal substrate, and an electrode layer on the electrode layer.
- An electrochemical element having an electrolyte layer provided, wherein the through hole is provided through a front surface and a back surface of the metal substrate, and the through hole is a region where the electrolyte layer is formed.
- the electrolyte layer has a first portion that covers the electrode layer and a second portion that contacts a surface on the front side of the metal substrate.
- the electrolyte layer since the electrolyte layer has the first portion that covers the electrode layer and the second portion that contacts the surface on the front side of the metal substrate, the electrolyte layer wraps the electrode layer.
- the electrolyte layer can be made difficult to peel off.
- the electrolyte layer can be bonded to the metal substrate by the second portion, so that the electrochemical device as a whole has excellent robustness. Further, gas leakage from the electrode layer can be suppressed in the second portion. To explain, when the electrochemical element is operated, gas is supplied from the back side of the metal substrate to the electrode layer through the through hole.
- the end portion of the electrode layer is exposed at a portion where the second portion does not exist at the end portion of the electrode layer, it is conceivable that a gas leak occurs from there. If the end portion of the electrode layer is securely covered by the second portion, gas leakage can be suppressed without providing another member such as a gasket. Furthermore, since the region where the through hole is formed is covered with an electrolyte layer having high airtightness and gas barrier properties, a separate structure for preventing leakage of gas to other places such as packing and sealing becomes unnecessary. . Therefore, an increase in the manufacturing cost of the element can be suppressed.
- the characteristic configuration of the solid oxide fuel cell according to the present invention for achieving the above object is that an electrode layer as a counter electrode of the electrode layer is provided on the electrolyte layer of the electrochemical element described above. It is in.
- the electrode layer serving as the counter electrode of the electrode layer is provided on the electrolyte layer of the electrochemical element to configure the solid oxide fuel cell (SOFC) cell, and thus the dense electrolyte layer is provided.
- SOFC solid oxide fuel cell
- the electrochemical device manufacturing method is characterized in that the electrochemical substrate has a metal substrate, an electrode layer, and an electrolyte layer, and the metal substrate has a front surface.
- an electrolyte material which is a material of the electrolyte layer, is attached over the electrode layer and the front surface of the metal substrate to cover the electrode layer
- the electrolyte material which is the material of the electrolyte layer
- the electrolyte layer is adhered over the electrode layer and the surface on the front side of the metal substrate, so that the first portion covering the electrode layer and the front side of the metal substrate are And an electrolyte layer forming step for forming an electrolyte layer having a second portion in contact with the surface. Therefore, the electrolyte layer can be configured to wrap the electrode layer, and the electrolyte layer can be configured to be difficult to peel off. .
- the electrolyte layer can be bonded to the metal substrate by the second portion, so that the electrochemical device as a whole has excellent robustness.
- the electrochemical element which suppressed the leak of the gas from an electrode layer in a 2nd part can be manufactured.
- gas is supplied from the back side of the metal substrate to the electrode layer through the through hole. If the end portion of the electrode layer is exposed at a portion where the second portion does not exist at the end portion of the electrode layer, it is conceivable that a gas leak occurs from there. If the end portion of the electrode layer is securely covered by the second portion, gas leakage can be suppressed without providing another member such as a gasket.
- the electrode layer forming step includes a pre-application step of applying an electrode layer material paste containing the electrode layer material to the front side surface of the metal substrate; After the preliminary coating step, the electrode layer material paste is pushed into the through hole and the electrode material paste remaining on the front surface of the metal substrate is wiped off, and after the pushing step, the metal And a main application step of applying the electrode layer material paste to the front surface of the substrate.
- an electrode material paste When an electrode material paste is applied to a metal substrate having a through hole, a part of the paste enters the through hole, and a dent is generated on the surface of the applied paste. If an electrolyte layer is formed thereon, dents have an adverse effect, so that a dense electrolyte layer cannot be formed. Therefore, by pressing the electrode layer material paste into the through hole and wiping off the electrode material paste remaining on the front surface of the metal substrate, the through hole is filled with the paste, and the surface of the metal substrate is It becomes smooth. Subsequently, an electrode layer having a smooth surface can be obtained by applying the electrode layer material paste to the front surface of the metal substrate.
- the electrode layer forming step includes the preliminary coating step, the push-wiping step performed after the preliminary coating step, and the main coating step performed after the pressing step. It is possible to form an electrode layer having a smooth upper surface while creating an insertion portion that is inserted into the hole and closes the through hole. Therefore, a dense electrolyte layer having a smooth surface can be formed on the smooth electrode layer, and an electrochemical device having more robustness can be produced.
- an electrolyte layer can be formed on the obtained smooth electrode layer by a low-temperature process such as a low-temperature firing method, an aerosol deposition method, or a spraying method (spray coating method), and does not undergo a high-temperature heat treatment. Thus, an electrochemical element having excellent durability can be manufactured.
- Another characteristic configuration of the method for producing an electrochemical device according to the present invention is that the electrode layer material paste is diluted with a solvent, and the dilution rate of the electrode layer material paste used in the preliminary application step with the solvent is the main component.
- the electrode layer material paste used in the coating step is higher than the dilution rate with a solvent.
- the electrode layer material paste having a high dilution ratio with the solvent is applied to the surface of the metal substrate in the preliminary application step, the material of the electrode layer easily enters the through hole of the metal substrate. Therefore, the through hole can be more reliably filled (closed) with the electrode layer material, and an electrode layer with a smoother surface can be obtained. That is, a denser electrolyte layer can be formed on the electrode layer, and an electrochemical element with higher robustness can be manufactured.
- an electrolyte layer can be formed on the obtained smooth electrode layer by a low-temperature process such as a low-temperature firing method, an aerosol deposition method, or a spraying method (spray coating method), and does not undergo a high-temperature heat treatment.
- a low-temperature process such as a low-temperature firing method, an aerosol deposition method, or a spraying method (spray coating method)
- spraying method spray coating method
- the electrode layer is a cermet material
- the electrode layer forming step includes a mixture ratio of the aggregate to the electrode layer material which is a material of the electrode layer.
- the second forming step of forming the electrode layer using the electrode layer material in which the mixing ratio of the aggregate is set to the second ratio larger than the first ratio is performed.
- the mixing ratio of the upper aggregate is larger than that below the electrode layer. Therefore, the strength and density above the electrode layer can be increased, and the bonding strength between the electrode layer and the electrolyte layer can be improved, the electrolyte layer can be formed at a low temperature, and the gas permeability of the electrode layer can be ensured. it can. Therefore, it is possible to produce an electrochemical element with higher robustness and durability.
- the characteristic configuration of the manufacturing method of the solid oxide fuel cell according to the present invention is that the counter electrode of the electrode layer is formed on the electrolyte layer after executing the manufacturing method of the electrochemical element.
- the counter electrode layer forming step for forming the electrode layer is performed.
- a solid oxide fuel cell (SOFC) cell in which an electrode layer serving as a counter electrode of the electrode layer is provided on the electrolyte layer of the electrochemical element is manufactured.
- SOFC solid oxide fuel cell
- an electrochemical element 1 a solid oxide fuel cell (SOFC) cell 100, a method for manufacturing an electrochemical element, and a method for manufacturing an SOFC will be described with reference to FIGS.
- SOFC solid oxide fuel cell
- the electrochemical element 1 includes a metal substrate 2 having a plurality of through holes 21, an electrode layer 3 provided on the surface of the metal substrate 2, and an electrolyte layer 4 provided on the electrode layer 3.
- the electrode layer 3 is configured to have electron conductivity and gas permeability.
- the electrolyte layer 4 is configured to have oxygen ion conductivity.
- Metal substrate 2 The metal substrate 2 supports the electrode layer 3 and the electrolyte layer 4 and plays a role of maintaining the strength of the electrochemical element 1.
- a material excellent in electronic conductivity, heat resistance, oxidation resistance and corrosion resistance is used.
- ferritic stainless steel, austenitic stainless steel, nickel base alloy, or the like is used.
- an alloy containing chromium is preferably used.
- the metal substrate 2 has a plurality of through-holes 21 provided so as to penetrate the front side surface and the back side surface.
- the through hole 21 can be provided in the metal substrate 2 by laser processing or the like.
- the through hole 21 has a function of transmitting gas from the back surface of the metal substrate 2 to the front surface.
- a porous metal can be used.
- the through hole 21 is preferably provided in a region smaller than a region where the electrode layer 3 is provided in the metal substrate 2.
- the metal substrate 2 is provided with a thin metal oxide film 22 on the surface thereof.
- the metal oxide film 22 is provided not only on the surface exposed to the outside of the metal substrate 2 but also on the contact surface (interface) with the electrode layer 3 and the inner surface of the through hole 21.
- This metal oxide film 22 can suppress elemental interdiffusion between the metal substrate 2 and the electrode layer 3.
- the metal oxide film 22 is mainly made of chromium oxide.
- the metal oxide film 22 which has chromium oxide as a main component suppresses that the chromium atom etc. of the metal substrate 2 diffuse to the electrode layer 3 or the electrolyte layer 4.
- the thickness of the metal oxide film is preferably on the order of submicrons.
- the average thickness is preferably about 0.3 ⁇ m or more and 0.7 ⁇ m or less.
- the minimum film thickness is preferably about 0.1 ⁇ m or more.
- the maximum film thickness is preferably about 1.1 ⁇ m or less.
- the thermal expansion coefficient of YSZ (yttria stabilized zirconia) or GDC (also referred to as gadolinium doped ceria, CGO), which is a material of the electrode layer 3 or the electrolyte layer 4, is close. Therefore, even when the low temperature and high temperature cycles are repeated, the electrochemical element 1 is not easily damaged. Therefore, it is preferable because the electrochemical device 1 having excellent long-term durability can be realized.
- the electrode layer 3 is provided in a thin film state in a region larger than a region where the through hole 21 is provided on the front surface of the metal substrate 2.
- a cermet material such as NiO—CGO (gadolinium doped ceria), Ni—CGO, NiO—YSZ, Ni—YSZ, CuO—CeO 2 , Cu—CeO 2 can be used. .
- CGO, YSZ, and CeO 2 can be referred to as cermet aggregates.
- the electrode layer 3 is formed by a low-temperature baking method (for example, a wet method using a baking process in a low temperature range in which a baking process is not performed in a high temperature range such as 1400 ° C.), an aerosol deposition method, a spraying method (spray coating method), or the like. It is preferable to form.
- a low-temperature baking method for example, a wet method using a baking process in a low temperature range in which a baking process is not performed in a high temperature range such as 1400 ° C.
- an aerosol deposition method for example, a spraying method (spray coating method), or the like.
- spraying method spraying method
- the electrode layer 3 can also include an insertion portion 33 that is inserted into the through hole 21 of the metal substrate 2 and closes the through hole 21. Further, according to circumstances, the electrode layer 3 includes a first layer 32 (lower part) adjacent to the front side surface of the metal substrate and a second layer 31 provided on the first layer 32 and adjacent to the electrolyte layer 4. A plurality of structures such as (upper part) may be used.
- the electrode layer 3 has a plurality of pores 34 inside and on the surface in order to provide gas permeability.
- the size of the pores 34 can be selected as appropriate so that a smooth reaction proceeds when an electrochemical reaction is performed.
- the pores 34 may include pores having a diameter of the opening 35 of 0.1 ⁇ m to 5 ⁇ m.
- the diameter of an opening part is 0.1 micrometer or more and 3 micrometers or less, and it is still more preferable that the diameter of an opening part is 0.1 micrometer or more and 1 micrometer or less.
- the insertion portion 33, the first layer 32, and the second layer 31 are preferably made of the same material, but can be made of different materials.
- it can be composed of materials containing different elements and materials having different element ratios.
- the composition ratio, the density, the strength, etc. of the aggregate of the cermet material can be made different among the insertion portion 33, the first layer 32, and the second layer 31.
- the number of layers in the electrode layer 3 may be three or more, or one.
- the aggregate ratio, density, and strength of the aggregate of the cermet material may be continuously increased from the lower side to the upper side of the electrode layer 3.
- the electrode layer 3 may not have a region that can be clearly distinguished as a layer.
- the content ratio of the cermet aggregate in the part adjacent to the electrolyte layer 4 (upper part), the density, the density, compared with the part adjacent to the metal substrate 2 in the electrode layer 3 (lower part) It is also possible to increase the strength and the like.
- the second layer 31 (upper part) adjacent to the electrolyte layer 4 can be configured to have higher strength than the first layer 32 (lower part) adjacent to the front surface of the metal substrate.
- a method that may give an impact to the underlying electrode layer 3 such as an aerosol deposition method or a spray coating method can be easily applied to the formation of the electrolyte layer 4.
- a dense electrolyte layer can be formed by a treatment at a low temperature, and the durability of the electrochemical device 1 is expected to be improved by not performing the treatment at a high temperature. it can.
- the type of cermet material, the particle size of the material powder to be used, and the conditions at the time of manufacture are determined. There are methods such as making them different. Further, as will be described later, the strength of the second layer 31 (upper part) can be made higher than that of the first layer 32 (lower part) by making the content ratio of the aggregate of the cermet material different.
- the density of the second layer 31 (upper part) adjacent to the electrolyte layer 4 is higher than that of the first layer 32 (lower part) adjacent to the front side surface of the metal substrate. It is also possible to do. Thereby, by forming the electrolyte layer 4 on a dense surface, the density of the electrolyte layer 4 can also be improved.
- gas permeability is required for the electrode layer of the electrochemical element, but the gas permeability decreases as the density increases.
- the lower part has a lower density than the upper part to ensure gas permeability, while the upper part has a higher density than the lower part, and the bonding strength between the electrode layer 3 and the electrolyte layer 4, and the electrolyte It becomes possible to set it as the structure which can improve the density of the layer 4.
- the type of cermet material, the particle size of the material powder to be used, and the manufacturing conditions are different. There is a technique such as. As will be described later, the density of the second layer 31 (upper part) can be made higher than that of the first layer 32 (lower part) by changing the content ratio of the aggregate of the cermet material.
- the fine density is the ratio of the material of the electrode layer 3 to the space. That is, when the density of the second layer 31 (upper part) is higher than that of the first layer 32 (lower part), the first layer 32 has voids existing on the surface or inside thereof as compared with the second layer 31. -The ratio of pores is large.
- the aggregate ratio of the cermet aggregate is higher in the second layer 31 (upper part) adjacent to the electrolyte layer 4 than in the first layer 32 (lower part) adjacent to the front side surface of the metal substrate. It can also be configured. As a result, the strength and density of the upper part can be increased, so that the electrode layer 3 serving as a base may be impacted by an aerosol deposition method or a spraying method (spray coating method) for forming the electrolyte layer 4. It is thought that a certain method becomes easier to apply.
- a dense electrolyte layer can be formed by a treatment at a low temperature, and the durability of the electrochemical device 1 is expected to be improved by not performing the treatment at a high temperature. it can.
- the high content ratio of the aggregate of the cermet material means that the content ratio of the metal or metal oxide (for example, NiO-CGO) mixed in the cermet material is low.
- the insertion part 33 is provided in a state of being inserted into the through hole 21 and closes the through hole 21.
- the insertion portion can be provided in a state of being inserted into the through hole 21 to a depth of about several ⁇ m. Further, it can be inserted to a depth of about several ⁇ m or more. Since the electrode layer 3 has the insertion portion 33, it is difficult for defects to occur in the electrode layer 3. As a result, a good electrolyte layer 4 can be formed, and a more excellent electrochemical device 1 can be realized.
- the electrolyte layer 4 is formed on the electrode layer 3. Moreover, it can also be set as the structure which has the 1st part 41 which coat
- FIG. 1 the electrolyte layer 4 is provided over (stranding) the electrode layer 3 and the surface on the front side of the metal substrate 2 in a cross-sectional side view. Thereby, the electrolyte layer 4 can be joined to the metal substrate 2 by the second portion 42, and the entire electrochemical device can be excellent in robustness.
- gas leakage from the electrode layer 3 can be suppressed in the second portion 42.
- gas is supplied from the back side of the metal substrate 2 to the electrode layer 3 through the through hole 21.
- gas leakage can be suppressed without providing another member such as a gasket.
- the entire periphery of the electrode layer 3 is covered by the second portion 42.
- the electrolyte layer 4 may be provided on the electrode layer 3 and a gasket or the like may be provided on the periphery.
- YSZ yttria stabilized zirconia
- SSZ sindium stabilized zirconia
- GDC gallium doped ceria
- zirconia ceramics are preferably used.
- the temperature during operation of the electrochemical element 1 can be made higher than that of ceria ceramics.
- the material of the electrolyte layer 4 is SOFC including the electrolyte layer 4 that can be operated in a high temperature range of about 650 ° C. or more, such as YSZ.
- the system configuration uses a hydrocarbon-based raw fuel such as LPG or LPG, and the raw fuel is made into SOFC anode gas by steam reforming or the like, the heat generated in the SOFC cell stack can be used for reforming the raw fuel gas. Therefore, a highly efficient SOFC system can be constructed.
- the electrolyte layer 4 is formed by a low-temperature baking method (for example, a wet method using a baking process in a low temperature range in which a baking process is not performed in a high temperature range such as 1400 ° C.), an aerosol deposition method, a spraying method (spray coating method), or the like. It is preferable.
- a low-temperature baking method for example, a wet method using a baking process in a low temperature range in which a baking process is not performed in a high temperature range such as 1400 ° C.
- an aerosol deposition method for example, an aerosol deposition method, a spraying method (spray coating method), or the like. It is preferable.
- the electrolyte layer 4 having a high density and high airtightness can be obtained without using baking in a high temperature region such as 1400 ° C., for example. Therefore, elemental interdiffusion between the metal substrate 2 and the electrode layer 3 can be suppressed, and an electrochemical element
- Electrolyte layer 4 is densely configured to maintain hermeticity.
- the electrolyte layer preferably includes an electrolyte layer having a relative density of 90% or more. Moreover, it is more preferable that an electrolyte layer having a relative density of 95% or more is included, and it is further preferable that an electrolyte layer having a relative density of 98% or more is included. Thus, it can be set as a precise
- the relative density represents the ratio of the density of the electrolyte layer 4 actually formed to the theoretical density of the electrolyte material.
- a dense electrolyte layer may be included in part of the electrolyte layer formed on the electrode layer.
- Solid oxide fuel cell (SOFC) cell 100 Solid oxide fuel cell (SOFC) cell 100
- a counter electrode layer 5 as a counter electrode of the electrode layer 3 on the electrolyte layer 4 as shown in FIG. It can be used as the physical fuel cell 100.
- a material of the counter electrode layer 5 serving as a counter electrode of the electrode layer 3 for example, a complex oxide such as LSCF, LSM, or the like can be used.
- the counter electrode layer 5 is a low-temperature baking method (for example, a wet method using a baking process in a low temperature range in which a baking process is not performed in a high temperature range such as 1400 ° C.), an aerosol deposition method, a spraying method (spray coating method), or the like. It is preferable to form by.
- a low-temperature baking method for example, a wet method using a baking process in a low temperature range in which a baking process is not performed in a high temperature range such as 1400 ° C.
- an aerosol deposition method for example, a spraying method (spray coating method), or the like.
- spraying method spraying method
- a fuel gas containing hydrogen is supplied from the back surface of the metal substrate 2 through the through hole 21 to the electrode layer 3, and air is supplied to the counter electrode layer 5 that is the counter electrode of the electrode layer 3. Is maintained at an operating temperature of about 700 ° C., for example.
- oxygen O 2 contained in air reacts with electrons e ⁇ in the counter electrode layer 5 to generate oxygen ions O 2 ⁇ .
- the oxygen ions O 2 ⁇ move through the electrolyte layer 4 to the electrode layer 3.
- hydrogen H 2 contained in the supplied fuel gas reacts with oxygen ions O 2 ⁇ to generate water H 2 O and electrons e ⁇ .
- the electrode layer 3 functions as a fuel electrode (anode) of the fuel cell
- the counter electrode layer 5 functions as an air electrode (cathode).
- the electrode layer formation step may include a preliminary application step, a push-wiping step, and a main application step (which may be a plurality of steps such as a first formation step and a second formation step). Further, the preliminary application step and the push-in wiping step can be omitted and only the main application step can be performed.
- the through hole of the metal substrate 2 can be provided by laser processing or the like.
- an electrode layer material paste containing the material of the electrode layer 3 is applied to the front surface of the metal substrate 2.
- a paste is prepared by mixing the powder of the electrode layer 3 material, which is a cermet material, with an organic solvent.
- the prepared paste is dropped or applied to the region of the metal substrate 2 where the through holes 21 are provided. At this time, a part of the paste flows into each through-hole 21 by capillary action.
- a paste having a lower dilution ratio with a solvent than the electrode layer material paste used in the preliminary application step can be used. That is, the dilution ratio of the electrode layer material paste used in the preliminary application step with the solvent can be made higher than the dilution ratio of the electrode layer material paste used in the main application step with the solvent.
- the paste is applied to an area wider than the area where the through hole 21 of the metal substrate 2 is provided. The application is performed, for example, by spraying or screen printing so that the thickness is uniform.
- the first forming step the first layer 32 (lower part) of the electrode layer 3 is formed.
- the preliminary coating step, the push-in wiping step, and the main coating step are performed, so that an insertion portion 33 that is inserted into the through hole 21 of the metal substrate 2 and closes the through hole 21 is created, and the upper surface is smooth.
- a simple electrode layer 3 can be formed. Therefore, the dense electrolyte layer 4 can be formed on the electrode layer 3, and the electrochemical element 1 having more robustness can be manufactured.
- the dilution ratio of the electrode layer material paste used in the preliminary application step with the solvent can be made higher than the dilution ratio of the electrode layer material paste used in the main application step with the solvent.
- the electrolyte layer 4 on the obtained smooth electrode layer 3 by a low-temperature process such as a low-temperature baking method, an aerosol deposition method, or a spraying method (spray coating method). By not passing, the electrochemical element 1 excellent in durability can be manufactured.
- a low-temperature process such as a low-temperature baking method, an aerosol deposition method, or a spraying method (spray coating method).
- a paste having a higher mixing ratio of the aggregate of the cermet material than the electrode layer material paste used in the first forming step can be used.
- the paste can be applied over the area where the paste is applied in the first forming step.
- the application is performed, for example, by spraying or screen printing so that the thickness is uniform.
- the second layer 31 (upper part) of the electrode layer 3 can be formed by the second forming step.
- the electrochemical device 1 After the first forming step, by performing a second forming step of forming the electrode layer 3 using an electrode layer material in which the mixing ratio of the aggregate is set to a second ratio larger than the first ratio, The mixing ratio of the upper aggregate can be increased compared to the lower part. Accordingly, the strength and density above the electrode layer 3 can be increased, and formation of the electrolyte layer 4 at a low temperature and ensuring of gas permeability of the electrode layer 3 can be realized. Accordingly, it is possible to manufacture the electrochemical device 1 with further improved robustness and durability.
- the main application step may be only the first formation step, or may include the third formation step or more of the same type.
- the preliminary application step and the push-in wiping step can be omitted.
- a degreasing process of heating to a temperature of about 400 ° C. to 450 ° C. may be performed.
- the metal substrate 2 on which the electrode layer 3 is formed is subjected to a heat treatment so that the electrode layer 3 is baked and a metal oxide film 22 is formed on the surface of the metal substrate 2.
- the firing step is performed, for example, by heating to 800 ° C. to 1100 ° C. in a mixed gas atmosphere adjusted by humidifying a mixed gas of hydrogen and nitrogen.
- the thickness of the metal oxide film 22 can be a suitable thickness of the order of submicrons. If the thickness of the metal oxide film 22 is too thick, the electric resistance of the metal substrate 2 becomes too large, or the metal oxide film 22 becomes brittle.
- the average thickness is preferably about 0.3 ⁇ m or more and 0.7 ⁇ m or less.
- the minimum film thickness is preferably about 0.1 ⁇ m or more.
- the maximum film thickness is preferably about 1.1 ⁇ m or less.
- the metal oxide film 22 is formed on the surface of the metal substrate 2 exposed to the outside, the surface in contact with the electrode layer 3 (interface), and the inner surface of the through hole 21. It is formed. Since this elemental diffusion between the metal substrate 2 and the electrode layer 3 can be suppressed by the metal oxide film 22, it is not necessary to provide a separate element diffusion preventing layer, and the manufacturing process can be simplified.
- the firing step is preferably performed under conditions adjusted so that the partial pressure of oxygen is 1.0 ⁇ 10 ⁇ 20 atm or more and 5.0 ⁇ 10 ⁇ 15 atm or less.
- the metal oxide film 22 can be formed with an appropriate thickness, a uniform thickness, and difficult to peel off, making element interdiffusion more effective.
- the electrochemical element 1 that can be suppressed automatically can be manufactured. If the metal oxide film 22 is too thin, the element interdiffusion function between the metal substrate 2 and the electrode layer 3 becomes insufficient, and if the metal oxide film 22 is too thick.
- the metal oxide film 22 can be formed to an appropriate thickness.
- the firing step in a mixed gas prepared by humidifying a mixed gas of hydrogen and nitrogen.
- a mixed gas prepared by humidifying a mixed gas of hydrogen and nitrogen.
- an atmosphere with a very low oxygen partial pressure is obtained, a thin and dense metal oxide film 22 that is difficult to peel off can be formed, and the element diffusion can be further suppressed.
- the chemical element 1 can be manufactured.
- the firing step is performed by heating to 800 ° C to 1100 ° C. In particular, it is preferable to carry out at 1050 ° C. or less, and it is more preferred to carry out at 1000 ° C. or less.
- the temperature of the mixed gas exceeds 1100 ° C.
- the oxygen partial pressure increases, and there is a possibility that element interdiffusion between the metal substrate 2 and the electrode layer 3 increases.
- the firing temperature is lower than 800 ° C., the strength of the electrode layer 3 is insufficient, or the metal oxide film 22 becomes too thin to suppress elemental interdiffusion between the metal substrate 2 and the electrode layer 3.
- the function may be insufficient. Therefore, by setting the firing step to 800 ° C. to 1100 ° C., an electrode layer having an appropriate strength and density can be formed while forming the metal oxide film 22 with an appropriate thickness, and an electric layer having excellent durability.
- the chemical element 1 can be manufactured.
- the oxygen partial pressure is adjusted after firing is performed under conditions adjusted so that the partial pressure of oxygen is 1.0 ⁇ 10 ⁇ 20 atm or more and 5.0 ⁇ 10 ⁇ 15 atm or less.
- a step of firing again under a condition (for example, in the air) higher than 5.0 ⁇ 10 ⁇ 15 atm may be included.
- a metal oxide film having an appropriate thickness is first obtained under conditions adjusted so that the partial pressure of oxygen is 1.0 ⁇ 10 ⁇ 20 atm or more and 5.0 ⁇ 10 ⁇ 15 atm or less.
- the electrode layer 3 is formed while suppressing an increase in the electrical resistance value of the metal substrate 2 while suppressing an increase in the metal oxide film 22 by adding a subsequent baking step in which the oxygen partial pressure is increased.
- the electrolyte layer 4 in a low-temperature process such as a low-temperature baking method, an aerosol deposition method, or a spraying method (spray coating method). .
- a method that may impact the underlying electrode layer 3 such as an aerosol deposition method or a thermal spraying method (spray coating method) to form the electrolyte layer 4.
- an electrolyte layer forming step After the firing step, that is, after the electrode layer forming step, an electrolyte layer forming step is performed.
- an electrolyte material that is a material of the electrolyte layer 4 is attached over the electrode layer 3 and the surface on the front side of the metal substrate 2, and the first portion 41 and the metal substrate that cover the electrode layer 3 are attached.
- the electrolyte layer 4 having the second portion 42 that contacts the front surface of the second surface can be formed.
- the electrolyte layer forming step is formed by a low-temperature firing method (for example, a wet method using a firing treatment in a low-temperature region that does not perform a firing treatment in a high-temperature region such as 1400 ° C.), an aerosol deposition method, or a spraying method (spray coating method). It is preferable to do.
- a low-temperature firing method for example, a wet method using a firing treatment in a low-temperature region that does not perform a firing treatment in a high-temperature region such as 1400 ° C.
- an aerosol deposition method for example, a spraying method (spray coating method). It is preferable to do.
- a dense and highly airtight electrochemical element can be manufactured without high-temperature heat treatment.
- elemental interdiffusion between the metal substrate 2 and the electrode layer 3 can be suppressed, and an electrochemical element excellent in durability can be realized.
- the counter electrode layer forming step uses a powder of a material (a composite oxide such as LSCF and LSM) as a counter electrode layer 5 which is a counter electrode of the electrode layer 3, and uses a low temperature firing method (for example, in a high temperature region such as 1400 ° C.). It can be formed by a wet method using a baking process in a low temperature range without a baking process), an aerosol deposition method, a spraying method (spray coating method), or the like.
- a powder of a material a composite oxide such as LSCF and LSM
- a low temperature firing method for example, in a high temperature region such as 1400 ° C.
- the electrochemical element 1 is used for the solid oxide fuel cell 100.
- the electrochemical element 1 is used for a solid oxide electrolytic cell, an oxygen sensor using a solid oxide, or the like. You can also
- the solid oxide fuel cell 100 in which the anode electrode is formed on the electrode layer 3 and the cathode electrode is formed on the counter electrode layer 5 is used.
- the cathode electrode is formed on the electrode layer 3 and the counter electrode is formed.
- An anode electrode may be formed on the electrode layer 5.
- the electrolyte layer 4 is laminated on the upper surface of the electrode layer 3 as shown in FIG. 1 or FIG.
- the counter electrode layer 5 was laminated on the upper surface of the electrolyte layer 4.
- a buffer layer 6 may be provided between the electrode layer 3 and the electrolyte layer 4 as shown in FIG.
- a reaction preventing layer (not shown) may be provided between the electrolyte layer 4 and the counter electrode layer 5.
- Buffer layer 6 As the material of the buffer layer 6, a material having oxygen ion (oxide ion) conductivity is suitable, for example, YSZ (yttria stabilized zirconia), SSZ (scandium stabilized zirconia), GDC (gadlium-doped ceria). YDC (yttrium-doped ceria), SDC (samarium-doped ceria), or the like can be used. In particular, use of ceria-based ceramics is more preferable because the buffer layer 6 has mixed conductivity and high device performance can be obtained.
- the buffer layer 6 is preferably formed by a low-temperature baking method (for example, a wet method using a baking process in a low temperature range in which a baking process in a high temperature range higher than 1100 ° C. is not performed), an aerosol deposition method, a thermal spraying method, or the like. Layer forming step). In particular, it is preferable to use a low-temperature firing method because handling of raw materials becomes easy.
- the buffer layer 6 preferably has a relative density smaller than that of the electrolyte layer 4.
- the buffer layer 6 preferably has a relative density higher than that of the electrode layer 3. This is preferable because it has an effect of improving the resistance of the element to various stresses including heat shock.
- the material for the reaction preventing layer may be any material that can prevent the reaction between the component of the electrolyte layer 4 and the component of the counter electrode layer 5.
- a ceria material or the like is used.
- the reaction-preventing layer is formed by a low-temperature baking method (for example, a wet method using a baking process in a low temperature range that does not perform a baking process in a high temperature range higher than 1100 ° C.), an aerosol deposition method, a thermal spraying method, a sputtering method, or a pulse laser deposition method. Etc. can be used as appropriate (reaction prevention layer forming step).
- a low-temperature baking method, an aerosol deposition method, a thermal spraying method, or the like because a low-cost element can be realized.
- it is more preferable to use a low-temperature firing method because handling of raw materials becomes easy.
- both the electrode layer 3 and the electrolyte layer 4 are provided in a region that is a surface on the front side of the metal substrate 2 and that is larger than the region in which the through hole 21 is provided. .
- the entire region where the through hole 21 is provided is covered with the electrode layer 3 and the electrolyte layer 4. That is, the through hole 21 is formed inside the region where the electrode layer 3 is formed on the metal substrate 2 and inside the region where the electrolyte layer 4 is formed. In other words, all the through holes 21 are provided facing the electrode layer 3. It is also possible to change this to the configuration shown in FIG.
- the electrode layer 3 is provided in a region smaller than the region in which the through hole 21 is provided.
- the buffer layer 6 and the electrolyte layer 4 are provided in a region larger than the region in which the through hole 21 is provided.
- the entire region where the through hole 21 is provided is covered with the buffer layer 6 and the electrolyte layer 4. That is, the through holes 21 are provided on the inner side and the outer side of the region where the electrode layer 3 is formed.
- the through hole 21 is provided inside the region where the electrolyte layer 4 is formed. In other words, the through hole 21 is provided facing both the electrode layer 3 and the buffer layer 6.
- the electrode layer 3 may include an insertion portion 33 that is inserted into the through hole 21 of the metal substrate 2 and closes the through hole 21.
- the buffer layer 6 may include an insertion portion 61 that is inserted into the through hole 21 of the metal substrate 2 and closes the through hole 21.
- the insertion portion 33 and the insertion portion 61 can be provided in a state of being inserted into the through hole 21 to a depth of about several ⁇ m to several tens of ⁇ m.
- FIG. 5 The configuration shown in FIG. 5 is also possible.
- the electrode layer 3 and the buffer layer 6 are provided in an area smaller than the area where the through hole 21 is provided.
- the electrolyte layer 4 is provided in a region larger than the region in which the through hole 21 is provided.
- the entire region where the through hole 21 is provided is covered with the electrolyte layer 4. That is, the through holes 21 are provided on the inner side and the outer side of the region where the electrode layer 3 is formed.
- the through holes 21 are provided inside and outside the region where the buffer layer 6 is formed.
- the through hole 21 is provided inside the region where the electrolyte layer 4 is formed. In other words, the through hole 21 is provided facing the electrode layer 3, the buffer layer 6, and the electrolyte layer 4.
- the buffer layer 6 may include an insertion portion 61 that is inserted into the through hole 21 of the metal substrate 2 and closes the through hole 21.
- the electrolyte layer 4 may include an insertion portion (not shown) that is inserted into the through hole 21 of the metal substrate 2 and closes the through hole 21.
- the configuration shown in FIG. 6 is also possible.
- the electrode layer 3 and the buffer layer 6 are provided in an area smaller than the area in which the through hole 21 is provided.
- the buffer layer 6 is provided in the region where the electrode layer 3 is provided.
- the electrolyte layer 4 is provided in a region larger than the region in which the through hole 21 is provided.
- the entire region where the through hole 21 is provided is covered with the electrolyte layer 4. That is, the through holes 21 are provided on the inner side and the outer side of the region where the electrode layer 3 is formed.
- the through hole 21 is provided inside the region where the electrolyte layer 4 is formed. In other words, the through hole 21 is provided facing the electrode layer 3 and the electrolyte layer 4.
- the electrolyte layer 4 may include an insertion portion (not shown) that is inserted into the through hole 21 of the metal substrate 2 and closes the through hole 21.
- a cermet material such as NiO—GDC, Ni—GDC, NiO—YSZ, Ni—YSZ, CuO—CeO 2 , Cu—CeO 2 is used as the material of the electrode layer 3, and the counter electrode layer 5
- a composite oxide such as LSCF or LSM was used as the material.
- hydrogen gas was supplied to the electrode layer 3 as a fuel electrode
- air was supplied to the counter electrode layer 5 as an air electrode
- the electrochemical element 1 was used as the solid oxide fuel cell 100.
- the electrochemical element 1 can be configured so that the electrode layer 3 can be an air electrode and the counter electrode layer 5 can be a fuel electrode.
- a composite oxide such as LSCF or LSM is used as the material of the electrode layer 3, and the material of the counter electrode layer 5 is, for example, NiO-GDC, Ni-GDC, NiO-YSZ, Ni-YSZ, CuO—CeO 2 , Cu Use a cermet material such as CeO 2 .
- air is supplied to the electrode layer 3 to form an air electrode
- hydrogen gas is supplied to the counter electrode layer 5 to form a fuel electrode
- the electrochemical element 1 is in a solid oxide form.
- the fuel cell 100 can be used.
- a metal substrate 2 was prepared by providing a plurality of through holes 21 by laser processing in a region having a radius of 7.5 mm from the center of a circular craft 22APU plate having a thickness of 0.3 mm and a diameter of 25 mm. At this time, the through hole was provided by laser processing so that the diameter of the through hole on the surface of the metal substrate 2 was about 10 to 15 ⁇ m.
- a paste is prepared by adding an organic binder and an organic solvent to the GDC powder, and the electrolyte layer 4 is applied to the entire surface of the metal substrate 2 by a spray method, and then the oxygen partial pressure is 1.7 ⁇ 10 ⁇ 15 at 1050 ° C.
- the electrolyte layer 4 was formed by performing a baking process for 2 hours in an atmosphere in which a mixed gas of H 2 / H 2 O / N 2 was adjusted so as to be atm. (Formation of the electrolyte layer 4 by a low-temperature baking method).
- LSCF powder 60% by weight of LSCF powder and 40% by weight of GDC powder are mixed, and an organic binder and an organic solvent are added to prepare a paste.
- a counter electrode is applied by spraying to a region having a radius of 7 mm from the center.
- baking treatment was performed in air at 850 ° C. for 1 hour to form the counter electrode layer 5.
- Example 1 a solid oxide fuel cell was produced in the same manner as in Example 1 except that the preliminary coating step and the push-in wiping step were not performed and no insertion portion was provided to close the through hole. .
- the solid oxide fuel cell thus obtained was subjected to electrochemical measurement using hydrogen and air. As a result, the airtightness of the electrolyte membrane was not maintained, and no potential difference occurred.
- Example 1 From the results of Example 1 and Comparative Example 1 above, it was found that a good electrolyte layer 4 can be formed by providing an insertion portion that closes the through hole.
- Example 2 A metal substrate 2 was prepared by providing a plurality of through-holes 21 by laser processing in a region having a radius of 2.5 mm from the center of a circular craft 22APU plate having a thickness of 0.3 mm and a diameter of 25 mm. At this time, the through hole was provided by laser processing so that the diameter of the through hole on the surface of the metal substrate 2 was about 10 to 15 ⁇ m.
- 8YSZ (yttria stabilized zirconia) powder having a mode diameter of about 0.7 ⁇ m was aerosolized with dry air having a flow rate of 6 L / min.
- the aerosol is introduced into a chamber having a pressure of 190 Pa, and is heated and sprayed in a range of 10 mm ⁇ 15 mm so as to cover the electrode layer onto the metal substrate 2 on which the electrode layer 3 is laminated.
- Layer 4 was formed, and electrochemical device 1 was obtained.
- FIG. 11 shows a cross-sectional SEM image of the electrochemical element 1 thus obtained. From FIG. 11, the thickness of the metal oxide film 22 was about 0.4 to 0.6 ⁇ m. It can also be seen that a dense electrolyte layer 4 is formed on the porous electrode layer 3.
- the hydrogen gas permeability (hydrogen leak amount) of the obtained electrochemical device 1 was measured, it was below the lower limit of detection (4.9 ⁇ 10 ⁇ 9 mol / m 2 Spa or less).
- the metal substrate 2 on which the electrode layer 3 was laminated was prepared in the same manner as in Example 2 without forming the electrolyte layer 4, and the hydrogen gas permeability (hydrogen leak) of the obtained electrochemical device 1 was produced.
- the amount was 1.1 ⁇ 10 2 mol / m 2 spa.
- the electrode layer 3 has gas permeability (hydrogen permeability), and the electrolyte layer 4 is dense and sufficiently airtight.
- the resultant was fired for 1 hour (baking step) to produce an electrochemical device 1.
- the electric resistance value in the thickness direction of the metal oxide film 22 on the metal substrate 2 of the electrochemical device 1 manufactured in Reference Example 2 was measured, it was found to be about 11 m ⁇ ⁇ cm 2 .
- the X-ray diffraction measurement was performed from the surface of the electrode layer 3 for the electrochemical device 1 produced in this Reference Example 2, it was caused by Ni and CeO 2 resulting from the components of the electrode layer 3 and the components of the metal substrate 2. A peak corresponding to Fe was observed.
- the electrochemical element of the reference example 3 was obtained.
- the surface layer of the electrode layer 3 was hardly peeled off, whereas in the electrochemical element 1 of Reference Example 2, the surface layer of the electrode layer 3 was peeled off by about 50%.
- a metal oxide film 22 having an appropriate thickness is formed under conditions adjusted such that the partial pressure of oxygen is 1.0 ⁇ 10 ⁇ 20 atm or more and 5.0 ⁇ 10 ⁇ 15 atm or less.
- the strength of the electrode layer 3 is increased while suppressing an increase in the electrical resistance value of the metal substrate 2 while suppressing an increase in the metal oxide film 22 by adding a subsequent baking step in which the oxygen partial pressure is increased. I found out that
- the thickness of the metal oxide film 22 is about 0.1 ⁇ m at the minimum, about 0.7 ⁇ m at the maximum, and about 0.3 ⁇ m on the average.
- the main component of the metal oxide film 22 is chromium oxide. Further, it was found that the metal oxide film 22 suppressed the diffusion of Cr and Fe in the metal substrate 2 to the electrode layer 3 and the diffusion of Ni from the electrode layer 3 to the metal substrate 2.
- the thickness of the metal oxide film 22 was found to be a minimum of about 0.2 ⁇ m, a maximum of about 1.1 ⁇ m, and an average of about 0.5 ⁇ m.
- the thickness of the metal oxide film 22 was found to be about 0.5 ⁇ m at minimum, about 1.0 ⁇ m at maximum, and about 0.67 ⁇ m on average. Moreover, when the cross-sectional EPMA observation of the electrochemical element 1 produced by this reference example 6 was performed, it turned out that the main component of the metal oxide film 22 is chromium oxide. Further, it was found that the metal oxide film 22 suppressed the diffusion of Cr and Fe in the metal substrate 2 to the electrode layer 3 and the diffusion of Ni from the electrode layer 3 to the metal substrate 2.
- (Reference Example 7) 1 in an atmosphere in which an H 2 / H 2 O / N 2 mixed gas is adjusted so that the oxygen partial pressure becomes 7.3 ⁇ 10 ⁇ 14 atm at 1150 ° C. with respect to the metal substrate 2 coated with the electrode layer 3.
- the electrochemical device 1 was produced in the same manner as in Reference Example 2 except that time firing was performed (firing step). When the electric resistance value in the thickness direction of the metal oxide film 22 on the metal substrate 2 of the electrochemical device 1 produced in Reference Example 7 was measured, it was found to be about 2.2 ⁇ ⁇ cm 2 or more.
- the thickness of the metal oxide film 22 was found to be about 0.6 ⁇ m at the minimum, about 1.4 ⁇ m at the maximum, and about 0.85 ⁇ m on the average.
- the metal oxide film 22 can be formed on the surface of the metal substrate 2 coated with the gas permeable electrode layer 3. It was also found that elemental interdiffusion between the metal substrate 2 and the electrode layer 3 can be suppressed by setting the thickness of the metal oxide film 22 to the submicron order. In particular, it has been found that the average thickness of the metal oxide film 22 is preferably about 0.3 ⁇ m to about 0.7 ⁇ m.
- the main component of the metal oxide film 22 is preferably chromium oxide, and further does not substantially contain a complex oxide of Cr and the elements constituting the electrode layer 3 (cannot be observed by X-ray diffraction). It was found that the electrochemical element 1 is preferable.
- 800 ° C. or higher 1100 ° C. or less preferably is preferably carried out at 850 ° C. or higher 1050 ° C. or less, the oxygen partial pressure 1.0 ⁇ 10 -20 atm or 5.0 ⁇ 10 - It has been found that it is preferable to include at least a firing step performed in an atmosphere of 15 atm or less.
- a metal substrate 2 was prepared by providing a plurality of through holes 21 by laser processing in a region having a radius of 2.5 mm from the center of a circular craft 22APU metal plate having a thickness of 0.3 mm and a diameter of 25 mm. At this time, the through hole was provided by laser processing so that the diameter of the through hole 21 on the surface of the metal substrate 2 was about 10 to 15 ⁇ m.
- Electrode layer formation step 60 wt% NiO powder and 40 wt% GDC powder were mixed, and an organic binder and an organic solvent were added to prepare a paste.
- spraying was performed on a region having a radius of 3 mm from the center of the metal substrate 2 and then dried at 80 ° C. The surface was observed with an optical microscope, and it was confirmed that the through hole 21 was filled with the paste.
- the paste was again sprayed and deposited on the same region of the metal substrate 2 and then dried at 60 ° C.
- the electrode layer 3 was formed (electrode layer formation step).
- the metal substrate 2 on which the electrode layer 3 was laminated was degreased in air at 450 ° C.
- a calcination treatment was performed at 850 ° C. for 1 hour in an atmosphere in which an H 2 / H 2 O / N 2 mixed gas was adjusted so that the oxygen partial pressure was 7.0 ⁇ 10 ⁇ 20 atm. (Baking step).
- the buffer layer 6 was formed by spraying and depositing the paste on a region having a radius of 5 mm from the center of the metal substrate 2 on which the electrode layer 3 was laminated.
- the metal substrate 2 on which the buffer layer 6 was laminated was baked at 1050 ° C. (buffer layer forming step).
- the thickness of the electrode layer 3 obtained by the above steps was about 10 ⁇ m, and the thickness of the buffer layer 6 was about 6 ⁇ m.
- 8YSZ (yttria stabilized zirconia) powder having a mode diameter of about 0.7 ⁇ m was aerosolized with dry air at a flow rate of 6 L / min. Aerosol was introduced into the chamber at a pressure of 190 Pa, and sprayed on the buffer layer 6 of the metal substrate 2 in a range of 15 mm ⁇ 15 mm so as to cover the buffer layer 6, thereby forming the electrolyte layer 4. At that time, the metal substrate 2 was sprayed at room temperature without heating (electrolyte layer forming step). In this way, an electrochemical element 1 was obtained.
- the thickness of the electrolyte layer 4 obtained by the above steps was about 6 ⁇ m.
- Example 4 A metal substrate 2 was prepared by providing a plurality of through holes 21 by laser processing in a region having a radius of 7.5 mm from the center of a circular craft 22APU plate having a thickness of 0.3 mm and a diameter of 25 mm. At this time, the through hole was provided by laser processing so that the diameter of the through hole on the surface of the metal substrate 2 was about 10 to 15 ⁇ m.
- the electrode layer 3 was formed by screen printing in an area having a radius of 3 mm from the center of the metal substrate 2 (electrode layer forming step). With this process, the filling of the through holes 21 and the formation of the electrode layer 3 are performed.
- the metal substrate 2 on which the electrode layer 3 was laminated was degreased in air at 450 ° C.
- a calcination treatment was performed at 850 ° C. for 1 hour in an atmosphere in which an H 2 / H 2 O / N 2 mixed gas was adjusted so that the oxygen partial pressure was 7.0 ⁇ 10 ⁇ 20 atm. (Baking step).
- a buffer layer 6 was formed in a region having a radius of 5 mm from the center of the metal substrate 2 on which the electrode layer 3 was laminated, by screen printing.
- the metal substrate 2 on which the buffer layer 6 was laminated was baked at 1050 ° C. (buffer layer forming step).
- the thickness of the electrode layer 3 obtained by the above steps was about 18 ⁇ m, and the thickness of the buffer layer 6 was about 10 ⁇ m.
- 8YSZ (yttria stabilized zirconia) powder having a mode diameter of about 0.7 ⁇ m was aerosolized with dry air at a flow rate of 6 L / min. Aerosol was introduced into a chamber having a pressure of 240 Pa, and sprayed on the buffer layer 6 of the metal substrate 2 in a range of 15 mm ⁇ 15 mm so as to cover the buffer layer 6, thereby forming the electrolyte layer 4. At that time, the metal substrate 2 was sprayed at room temperature without heating (electrolyte layer forming step). In this way, an electrochemical element 1 was obtained.
- the thickness of the electrolyte layer 4 obtained by the above steps was about 7 ⁇ m.
- reaction preventing layer forming step After, the metal-supported electrochemical element E on which the reaction preventing layer was formed was baked at 1000 ° C. (reaction preventing layer forming step).
- the counter electrode layer 5 was formed on the reaction preventing layer by screen printing. Finally, the electrochemical device 1 on which the counter electrode layer 5 was formed was fired at 900 ° C. (counter electrode layer forming step), and the solid oxide fuel cell 100 was obtained.
- FIG. 12 shows an electron micrograph of the cross section of the electrochemical device 1 obtained in this way.
- the electrode layer 3 is inserted into the through hole 21 of the metal substrate 2. That is, an insertion portion 33 that is inserted into the through hole 21 of the metal substrate 2 and closes the through hole 21 is formed.
- the insertion portion 33 thus formed was formed to a depth of about 50 ⁇ m from the surface of the metal substrate 2. Large defects such as gaps and cracks are not seen in the region above the through hole 21 in the electrode layer 3. That is, since the electrode layer 3 is inserted into the through hole 21 of the metal substrate 2 to form the insertion portion 33 that closes the through hole 21, the upper side of the portion without the through hole 21 is also located above the through hole 21. It can be seen that the same high-quality electrode layer is formed.
- Electrode layer 1 Electrochemical element 2: Metal substrate 21: Through hole 22: Metal oxide film 3: Electrode layer 31: Second layer (upper part) 32: 1st layer (lower part) 33: Insertion part 34: Pore 35: Opening part 4: Electrolyte layer 41: First part 42: Second part 43: Fine particles 5: Counter electrode layer 100: Solid oxide fuel cell
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Abstract
Description
以下、図1および図2を参照しながら電気化学素子1、固体酸化物形燃料電池(SOFC)セル100、電気化学素子の製造方法およびSOFCの製造方法について説明する。なお、層の位置関係などを表す際、例えば電極層から見て電解質層4の側を「上」「上側」、金属基板2の側を「下」「下側」などと呼ぶ。
電気化学素子1は、複数の貫通孔21を有する金属基板2と、金属基板2の表側の面に設けられた電極層3と、電極層3の上に設けられた電解質層4とを有する。電極層3は電子伝導性および気体透過性を有するように構成される。電解質層4は酸素イオン伝導性を有するように構成される。
金属基板2は、電極層3と電解質層4とを支持して電気化学素子1の強度を保つ役割を担う。金属基板2の材料としては、電子伝導性、耐熱性、耐酸化性および耐腐食性に優れた材料が用いられる。例えば、フェライト系ステンレス、オーステナイト系ステンレス、ニッケル基合金などが用いられる。特に、クロムを含む合金が好適に用いられる。
貫通孔21は、金属基板2における電極層3が設けられる領域より小さい領域に設けられることが好ましい。
電極層3は、図1に示すように、金属基板2の表側の面の貫通孔21が設けられた領域より大きな領域に、薄膜の状態で設けられる。電極層3の材料としては、例えばNiO-CGO(ガドリウム・ドープ・セリア)、Ni-CGO、NiO-YSZ、Ni-YSZ、CuO-CeO2、Cu-CeO2などのサーメット材を用いることができる。これらの例では、CGO、YSZ、CeO2がサーメット材の骨材と呼ぶことができる。なお、電極層3は、低温焼成法(例えば1400℃等の高温域での焼成処理をしない低温域での焼成処理を用いる湿式法)やエアロゾルデポジション法、溶射法(スプレーコート法)などにより形成することが好ましい。これらの、低温域での使用可能なプロセスにより、例えば1400℃等の高温域での焼成を用いずに、良好な電極層3が得られる。そのため、金属基板2を傷めることなく、また、金属基板2と電極層3との元素相互拡散を抑制することができ、耐久性に優れた電気化学素子を実現できるので好ましい。更に、低温焼成法を用いると、原材料のハンドリングが容易になるので更に好ましい。
なお、サーメット材の骨材の含有比が高いとは、サーメット材に混合する金属または金属酸化物(例えばNiO-CGO)の含有比が低いことを意味する。
電解質層4は、電極層3の上部に形成する。また、電極層3を被覆する第1部分41と、金属基板2の表側の面に接触する第2部分42とを有するような構造とすることもできる。この場合、電解質層4は、図1に示すように、横断側面視において電極層3の上と金属基板2の表側の面の上とにわたって(跨って)設けられる。これにより、第2部分42により電解質層4を金属基板2に接合して、電気化学素子全体として堅牢性に優れたものとすることができる。
説明すると、電気化学素子1の作動時には、金属基板2の裏側から貫通孔21を通じて電極層3へガスが供給される。第2部分42の存在する部位においては、ガスケット等の別部材を設けることなく、ガスのリークを抑制することができる。なお、第1実施形態では第2部分42によって電極層3の周囲をすべて覆っているが、電極層3の上部に電解質層4を設け、周囲にガスケット等を設ける構成としてもよい。
このように構成した電気化学素子1に対して、図2に示すように、電解質層4の上に電極層3の対極となる対極電極層5を設けることで、以下のように動作する固体酸化物形燃料電池セル100として利用することが可能である。電極層3の対極となる対極電極層5の材料としては、例えば、LSCF、LSM等の複合酸化物を用いることができる。なお、対極電極層5は、低温焼成法(例えば1400℃等の高温域での焼成処理をしない低温域での焼成処理を用いる湿式法)やエアロゾルデポジション法、溶射法(スプレーコート法)などにより形成することが好ましい。これらの、低温域での使用可能なプロセスにより、例えば1400℃等の高温域での焼成を用いずに、良好な対極電極層5が得られる。そのため、金属基板2を傷めることなく、また、金属基板2と電極層3との元素相互拡散を抑制することができ、耐久性に優れた電気化学素子を実現できるので好ましい。更に、低温焼成法を用いると、原材料のハンドリングが容易になるので更に好ましい。
次に、電気化学素子1の製造方法について説明する。
電極層形成ステップでは、金属基板2の表側の面の貫通孔21が設けられた領域より広い領域に電極層3が形成される。電極層形成ステップは、予備塗布ステップ、押し込み拭取りステップ、主塗布ステップ(第1形成ステップと第2形成ステップ等の複数のステップとすることもできる)を有するものとすることができる。また、予備塗布ステップや押し込み拭取りステップを省き、主塗布ステップのみとすることもできる。
なお、金属基板2の貫通孔はレーザー加工等によって設けることができる。
予備塗布ステップでは、電極層3の材料を含有する電極層材料ペーストが金属基板2の表側の面に塗布される。まずサーメット材である電極層3の材料の粉末を有機溶媒に混ぜたペーストを作成する。次に、作成したペーストを金属基板2の貫通孔21が設けられた領域に滴下、あるいは塗布する。このとき、ペーストの一部は毛細管現象により各貫通孔21の内部に流れ込む。
続いて行われる押し込み拭取りステップでは、金属基板2の表面上のペーストが、ブレード等によりワイプされる。すなわち、貫通孔21へペーストを押し込むとともに金属基板2の表側の面に残留するペーストが拭き取られる。これによって、貫通孔21がペーストで埋まり(塞がり)、金属基板2の表面から余分なペーストが除去されて、金属基板2の表面が平滑になる。すなわち、金属基板2の貫通孔21が電極層材料ペーストにより孔埋めされた状態になる。押し込み拭取りステップを行った後、金属基板2を乾燥させてもよい。
なお、適切なペーストを選び、各種条件を適切なものにすることで、予備塗布ステップと押し込み拭取りステップをまとめてスクリーン印刷法により行うこともできる。
続いて行われる主塗布ステップ(第1形成ステップ)では、予備塗布ステップに用いられた電極層材料ペーストに比べ、溶媒による希釈率が低いペーストを用いることができる。すなわち、予備塗布ステップに用いられる電極層材料ペーストの溶媒による希釈率は、主塗布ステップに用いられる電極層材料ペーストの溶媒による希釈率に比べて高くすることができる。そのペーストを金属基板2の貫通孔21が設けられた領域より広い領域に塗布する。塗布は、例えばスプレー法やスクリーン印刷法により、厚さが均等になるように行われる。第1形成ステップにより、電極層3の第1層32(下方部位)が形成される。
続いて行われる第2形成ステップでは、第1形成ステップに用いられた電極層材料ペーストに比べ、サーメット材の骨材の混合比率が高いペーストを用いることができる。そのペーストを第1形成ステップでペーストが塗布された領域に重ねて塗布することができる。塗布は、例えばスプレー法やスクリーン印刷法により、厚さが均等になるように行われる。第2形成ステップにより、電極層3の第2層31(上方部位)を形成することができる。
主塗布ステップを行った後に、電極層3が形成された金属基板2を加熱処理して、電極層3を焼成するとともに金属基板2の表面に金属酸化物膜22を形成する焼成ステップを行う。焼成ステップは、例えば、水素と窒素の混合気体を加湿して調整した混合ガス雰囲気下で、800℃~1100℃に加熱して行う。このような条件下で焼成ステップを行うと、金属酸化物膜22の厚さが、サブミクロンオーダーの厚さの好適なものとすることができる。金属酸化物膜22の厚さは、厚すぎると金属基板2の電気抵抗が大きくなりすぎるという不具合が生じたり、金属酸化物膜22がもろくなったりする。一方、薄すぎると金属基板2と電極層3との元素相互拡散を抑制効果が不十分となる。このため、例えば、平均的な厚さが0.3μm以上0.7μm以下程度であることが好ましい。また、最小膜厚は約0.1μm以上であることが好ましい。また、最大膜厚が約1.1μm以下であることが好ましい。
焼成ステップの後、すなわち電極層形成ステップの後に、電解質層形成ステップが行われる。電解質層形成ステップでは、電極層3の上と金属基板2の表側の面の上とにわたって電解質層4の材料である電解質材料を付着させて、電極層3を被覆する第1部分41と金属基板2の表側の面に接触する第2部分42とを有する電解質層4を形成することができる。
上述のステップで製造された電気化学素子1に対して、電解質層4の上に電極層3の対極となる対極電極層5を形成する対極電極層形成ステップを実行することで、固体酸化物形燃料電池セル100を製造することができる。対極電極層形成ステップは、電極層3の対極となる対極電極層5としての材料(LSCF、LSM等の複合酸化物)の粉末を用いて、低温焼成法(例えば1400℃等の高温域での焼成処理をしない低温域での焼成処理を用いる湿式法)やエアロゾルデポジション法、溶射法(スプレーコート法)などにより形成することができる。
上記の第1実施形態では、電気化学素子1を固体酸化物形燃料電池セル100に用いたが、電気化学素子1を固体酸化物形電解セルや、固体酸化物を利用した酸素センサ等に利用することもできる。
上記の実施形態では、電極層3にアノード極を形成し、対極電極層5にカソード極を形成した固体酸化物形燃料電池セル100を用いたが、電極層3にカソード極を形成し、対極電極層5にアノード極を形成することもできる。
上記の第1実施形態では、電解質層4は、図1または図2に示されるように、電極層3の上側の面に積層された。また、対極電極層5は、電解質層4の上側の面に積層された。これを変更して、図3に示すように、電極層3と電解質層4との間に緩衝層6を設けてもよい。また、電解質層4と対極電極層5との間に反応防止層(図示なし)を設けてもよい。
緩衝層6の材料としては、酸素イオン(酸化物イオン)伝導性を有する材料が好適であり、例えばYSZ(イットリア安定化ジルコニア)、SSZ(スカンジウム安定化ジルコニア)やGDC(ガドリウム・ドープ・セリア)、YDC(イットリウム・ドープ・セリア)、SDC(サマリウム・ドープ・セリア)等を用いることができる。特に、セリア系のセラミックスを用いると、緩衝層6が混合伝導性を有することになり、高い素子性能が得られるためより好ましい。緩衝層6は、低温焼成法(例えば1100℃より高い高温域での焼成処理をしない低温域での焼成処理を用いる湿式法)やエアロゾルデポジション法、溶射法などにより形成することが好ましい(緩衝層形成ステップ)。特に、低温焼成法を用いると、原材料のハンドリングが容易になるので好ましい。緩衝層6は、その相対密度が電解質層4の相対密度よりも小さいことが好ましい。また、緩衝層6は、その相対密度が電極層3の相対密度よりも大きいことが好ましい。これらのようにすると、素子のヒートショックをはじめとする各種の応力に対する耐性を向上できるという効果があり好ましい。
反応防止層の材料としては、電解質層4の成分と対極電極層5の成分との間の反応を防止できる材料であれば良い。例えばセリア系材料等が用いられる。反応防止層を電解質層4と対極電極層5との間に導入することにより、対極電極層5の構成材料と電解質層4の構成材料との反応が効果的に抑制され、素子の性能の長期安定性を向上できる。反応防止層は、低温焼成法(例えば1100℃より高い高温域での焼成処理をしない低温域での焼成処理を用いる湿式法)やエアロゾルデポジション法、溶射法、スパッタリング法、パルスレーザーデポジション法などを適宜用いて形成することができる(反応防止層形成ステップ)。特に、低温焼成法やエアロゾルデポジション法や溶射法などを用いると低コストな素子が実現できるので好ましい。更に、低温焼成法を用いると、原材料のハンドリングが容易になるので更に好ましい。
上述した第4実施形態では、図3に示すように、電極層3および電解質層4の両方が、金属基板2の表側の面であって貫通孔21が設けられた領域より大きな領域に設けられる。
貫通孔21が設けられた領域の全体が、電極層3および電解質層4によって覆われている。
つまり貫通孔21は、金属基板2における電極層3が形成された領域の内側であって、かつ電解質層4が形成された領域の内側に形成される。換言すれば、全ての貫通孔21が電極層3に面して設けられている。これを変更して、図4に示す構成とすることも可能である。
また図5に示す構成も可能である。図5に示す構成では、電極層3および緩衝層6が、貫通孔21が設けられた領域より小さな領域に設けられる。電解質層4が、貫通孔21が設けられた領域より大きな領域に設けられる。貫通孔21が設けられた領域の全体が、電解質層4によって覆われている。つまり貫通孔21は、電極層3が形成された領域の内側と外側とに設けられる。貫通孔21は、緩衝層6が形成された領域の内側と外側とに設けられる。また貫通孔21は電解質層4が形成された領域の内側に設けられる。換言すれば、貫通孔21は電極層3と緩衝層6と電解質層4とに面して設けられている。緩衝層6は、金属基板2の貫通孔21に挿入され貫通孔21を塞ぐ挿入部61を備えてもよい。また、電解質層4は、金属基板2の貫通孔21に挿入され貫通孔21を塞ぐ挿入部(図示なし)を備えてもよい。
また図6に示す構成も可能である。図6に示す構成では、電極層3および緩衝層6が、貫通孔21が設けられた領域より小さな領域に設けられる。緩衝層6は、電極層3が設けられた領域に設けられる。電解質層4が、貫通孔21が設けられた領域より大きな領域に設けられる。貫通孔21が設けられた領域の全体が、電解質層4によって覆われている。
つまり貫通孔21は、電極層3が形成された領域の内側と外側とに設けられる。また貫通孔21は電解質層4が形成された領域の内側に設けられる。換言すれば、貫通孔21は電極層3と電解質層4とに面して設けられている。電解質層4は、金属基板2の貫通孔21に挿入され貫通孔21を塞ぐ挿入部(図示なし)を備えてもよい。
上記の実施形態では、電極層3の材料として例えばNiO-GDC、Ni-GDC、NiO-YSZ、Ni-YSZ、CuO-CeO2、Cu-CeO2などのサーメット材を用い、対極電極層5の材料として例えばLSCF、LSM等の複合酸化物を用いた。そして電極層3に水素ガスを供給して燃料極とし、対極電極層5に空気を供給して空気極とし、電気化学素子1を固体酸化物形燃料電池セル100として用いた。これを変更して、電極層3を空気極とし、対極電極層5を燃料極とすることが可能なように、電気化学素子1を構成することも可能である。すなわち、電極層3の材料として例えばLSCF、LSM等の複合酸化物を用い、対極電極層5の材料として例えばNiO-GDC、Ni-GDC、NiO-YSZ、Ni-YSZ、CuO-CeO2、Cu-CeO2などのサーメット材を用いる。このように構成した電気化学素子1であれば、電極層3に空気を供給して空気極とし、対極電極層5に水素ガスを供給して燃料極とし、電気化学素子1を固体酸化物形燃料電池セル100として用いることができる。
厚さ0.3mm、直径25mmの円形のcrofer22APUの板に対して、中心から半径7.5mmの領域にレーザー加工により貫通孔21を複数設けて、金属基板2を作成した。なお、この時、金属基板2の表面の貫通孔の直径が10~15μm程度となるようにレーザー加工により貫通孔を設けた。
こうして得られた固体酸化物形燃料電池セルについて、水素と空気を用いて電気化学測定を行ったところ、0.2Vを上回る有意な電圧が得られた。
上記の実施例1において、予備塗布ステップと押し込み拭取りステップを行わずに、貫通孔を塞ぐ挿入部を設けないこと以外は、実施例1と同様にして固体酸化物形燃料電池セルを作製した。こうして得た固体酸化物形燃料電池セルについて、水素と空気を用いて電気化学測定を行ったところ、電解質膜の気密性が保たれず、電位差が発生しなかった。
厚さ0.3mm、直径25mmの円形のcrofer22APUの板に対して、中心から半径2.5mmの領域にレーザー加工により貫通孔21を複数設けて、金属基板2を作成した。なお、この時、金属基板2の表面の貫通孔の直径が10~15μm程度となるようにレーザー加工により貫通孔を設けた。
電解質層4を形成することなく、他は上記の実施例2と同様にして、電極層3を積層させた金属基板2を作製し、得られた電気化学素子1の水素ガス透過率(水素リーク量)を測定したところ、1.1×102mol/m2sPaであった。
厚さ0.3mm、直径25mmの円形のcrofer22APUの板を金属基板2として用い、60重量%のNiO粉末と40重量%のGDC粉末を混合し、有機バインダーと有機溶媒を加えてペーストを作成し、金属基板2の上に直径17mmの領域にスクリーン印刷法により電極層3を塗布した。その後、空気中、450℃で脱脂処理を行った(主塗布ステップ)。
次に、電極層3を塗布した金属基板2に対して、850℃で酸素分圧が7.0×10-20atmになるようにH2/H2O/N2混合ガスを調整した雰囲気下で1時間焼成を行い(焼成ステップ)、電気化学素子1を作製した。
この参考例2で作製した電気化学素子1の金属基板2における金属酸化物膜22の厚さ方向の電気抵抗値を測定したところ、約11mΩ・cm2であることが分かった。
さらに、この参考例2作製した電気化学素子1について、電極層3の表面からX線回折測定を行ったところ、電極層3の成分に起因するNi及びCeO2と金属基板2の成分に起因するFe相当のピークが観察された。
電極層3を塗布した金属基板2に対して、850℃で酸素分圧が7.0×10-20atmになるようにH2/H2O/N2混合ガスを調整した雰囲気下で1時間焼成を行い、更にその後に、850℃空気中で30分焼成を行った(焼成ステップ)こと以外は参考例1と同様にして、電気化学素子1を作製した。
この参考例3で作製した電気化学素子1の金属基板2における金属酸化物膜22の厚さ方向の電気抵抗値を測定したところ、約15mΩ・cm2であることが分かった。
さらに、この参考例3で作製した電気化学素子1について、電極層3の表面からX線回折測定を行ったところ、電極層3の成分に起因するNiO及びCeO2と金属基板2の成分に起因するFe相当のピークが観察された。
電極層3を塗布した金属基板2に対して、950℃で酸素分圧が5.1×10-18atmになるようにH2/H2O/N2混合ガスを調整した雰囲気下で1時間焼成を行った(焼成ステップ)こと以外は参考例2と同様にして、電気化学素子1を作製した。
この参考例4で作製した電気化学素子1の金属基板2における金属酸化物膜22の厚さ方向の電気抵抗値を測定したところ、約19mΩ・cm2であることが分かった。
さらに、この参考例4で作製した電気化学素子1について、電極層3の表面からX線回折測定を行ったところ、電極層3の成分に起因するNi及びCeO2と金属基板2の成分に起因するFe相当のピークが観察された。
また、この参考例4で作製した電気化学素子1の断面SEM観察を行った結果を図7に示す。図7より、金属酸化物膜22の厚さは、最小で0.1μm程度、最大で0.7μm程度、平均的には0.3μm程度であることが分かった。また、この参考例4で作製した電気化学素子1の断面EPMA観察を行ったところ、金属酸化物膜22の主成分が酸化クロムであることが分かった。また、金属酸化物膜22により、金属基板2中のCrやFeの電極層3への拡散が抑制され、電極層3から金属基板2へのNiの拡散が抑制されていることが分かった。
電極層3を塗布した金属基板2に対して、950℃で酸素分圧が5.1×10-18atmになるようにH2/H2O/N2混合ガスを調整した雰囲気下で1時間焼成を行った後、更に、950℃空気中で30分焼成を行った(焼成ステップ)こと以外は参考例2と同様にして、電気化学素子1を作製した。
この参考例5で作製した電気化学素子1の金属基板2における金属酸化物膜22の厚さ方向の電気抵抗値測定したところ、約23mΩ・cm2であることが分かった。
さらに、この参考例5で作製した電気化学素子1について、電極層3の表面からX線回折測定を行ったところ、電極層3の成分に起因するNiO及びCeO2と金属基板2の成分に起因するFe相当のピークが観察された。
また、この参考例5で作製した電気化学素子1の断面SEM観察を行った結果を図8に示す。図8に示すように、金属酸化物膜22の厚さは、最小で0.2μm程度、最大で1.1μm程度、平均的には0.5μm程度であることが分かった。また、この参考例5で作製した電気化学素子1の断面EPMA観察を行ったところ、金属酸化物膜22の主成分が酸化クロムであることが分かった。また、金属酸化物膜22により、金属基板2中のCrやFeの電極層3への拡散が抑制され、電極層3から金属基板2へのNiの拡散が抑制されていることが分かった。
電極層3を塗布した金属基板2に対して、1050℃で酸素分圧が4.1×10-17atmになるようにH2/H2O/N2混合ガスを調整した雰囲気下で30分焼成を行った後、更に、1050℃で酸素分圧が2.0×10-2atmになるようにO2/H2O/N2混合ガスを調整した雰囲気下で15分焼成を行った(焼成ステップ)こと以外は参考例2と同様にして、電気化学素子1を作製した。
この参考例6で作製した電気化学素子1の金属基板2における金属酸化物膜22の厚さ方向の電気抵抗値を測定したところ、約31mΩ・cm2であることが分かった。
さらに、この参考例6で作製した電気化学素子1について、電極層3の表面からX線回折測定を行ったところ、電極層3の成分に起因するNiO及びCeO2と金属基板2の成分に起因するFe相当のピークが観察された。
また、この参考例6で作製した電気化学素子1の断面SEM観察を行った結果を図9に示す。図9に示すように、金属酸化物膜22の厚さは、最小で0.5μm程度、最大で1.0μm程度、平均的には0.67μm程度であることが分かった。また、この参考例6で作製した電気化学素子1の断面EPMA観察を行ったところ、金属酸化物膜22の主成分が酸化クロムであることが分かった。また、金属酸化物膜22により、金属基板2中のCrやFeの電極層3への拡散が抑制され、電極層3から金属基板2へのNiの拡散が抑制されていることが分かった。
電極層3を塗布した金属基板2に対して、1150℃で酸素分圧が7.3×10-14atmになるようにH2/H2O/N2混合ガスを調整した雰囲気下で1時間焼成を行った(焼成ステップ)こと以外は参考例2と同様にして、電気化学素子1を作製した。
この参考例7で作製した電気化学素子1の金属基板2における金属酸化物膜22の厚さ方向の電気抵抗値を測定したところ、約2.2Ω・cm2以上であることが分かった。
さらに、この参考例7で作製した電気化学素子1について、電極層3の表面からX線回折測定を行ったところ、電極層3の成分に起因するNi及びCeO2と金属基板2の成分に起因するFe相当のピークが観察された。そして、CeCrO3の複合酸化物のピークが観察された。
また、この参考例7で作製した電気化学素子1の断面SEM観察を行った結果を図10に示す。図10に示すように、金属酸化物膜22の厚さは、最小で0.6μm程度、最大で1.4μm程度、平均的には0.85μm程度であることが分かった。また、この参考例7で作製した電気化学素子1の断面EPMA観察を行ったところ、Crの電極層への拡散が比較的多くなっているように見られた。
この結果、1150℃で酸素分圧が7.2×10-14atmになるようにH2/H2O/N2混合ガスを調整した雰囲気下で焼成ステップを行うと、金属基板の電気抵抗値が極端に大きくなり、電気化学素子としての性能が低下することが分かった。また、金属基板2からのCrの拡散抑制の効果が低下してしまいCeCrO3の複合酸化物がX線回折測定で観察される結果となった。
厚さ0.3mm、直径25mmの円形のcrofer22APUの金属板に対して、中心から半径2.5mmの領域にレーザー加工により貫通孔21を複数設けて、金属基板2を作成した。なお、この時、金属基板2の表面の貫通孔21の直径が10~15μm程度となるようにレーザー加工により貫通孔を設けた。
厚さ0.3mm、直径25mmの円形のcrofer22APUの板に対して、中心から半径7.5mmの領域にレーザー加工により貫通孔21を複数設けて、金属基板2を作成した。なお、この時、金属基板2の表面の貫通孔の直径が10~15μm程度となるようにレーザー加工により貫通孔を設けた。
2 :金属基板
21 :貫通孔
22 :金属酸化物膜
3 :電極層
31 :第2層(上方部位)
32 :第1層(下方部位)
33 :挿入部
34 :細孔
35 :開口部
4 :電解質層
41 :第1部分
42 :第2部分
43 :微細粒子
5 :対極電極層
100 :固体酸化物形燃料電池セル
Claims (14)
- 複数の貫通孔を有する金属基板と、
前記金属基板の表側の面に設けられた電極層と、
前記電極層の上に設けられた電解質層とを有する電気化学素子であって、
前記貫通孔は前記金属基板の表側の面と裏側の面とを貫通して設けられ、
前記電極層は前記金属基板の前記貫通孔が設けられた領域より広い領域に設けられ、
前記電解質層は、前記電極層を被覆する第1部分と、前記金属基板の表側の面に接触する第2部分とを有する電気化学素子。 - 前記電極層は前記貫通孔に挿入され前記貫通孔を塞ぐ挿入部を有する請求項1に記載の電気化学素子。
- 前記電極層は、前記金属基板に隣接する下方部位に比べ、前記電解質層に隣接する上方部位の強度が高い請求項1または2に記載の電気化学素子。
- 前記電極層は、前記金属基板に隣接する下方部位に比べ、前記電解質層に隣接する上方部位の緻密度が高い請求項1~3のいずれか1項に記載の電気化学素子。
- 前記電極層はサーメット材であり、前記電極層は、前記金属基板に隣接する下方部位に比べ、前記電解質層に隣接する上方部位において前記サーメット材の骨材の含有比が高い請求項1~4のいずれか1項に記載の電気化学素子。
- 前記金属基板はフェライト系ステンレス材である請求項1~5のいずれか1項に記載の電気化学素子。
- 前記電解質層はジルコニア系のセラミックスを含む請求項1~6のいずれか1項に記載の電気化学素子。
- 複数の貫通孔を有する金属基板と、
前記金属基板の表側の面に設けられた電極層と、
前記電極層の上に設けられた電解質層とを有する電気化学素子であって、
前記貫通孔は前記金属基板の表側の面と裏側の面とを貫通して設けられ、
前記貫通孔は前記電解質層が形成された領域の内側に形成されており、
前記電解質層は、前記電極層を被覆する第1部分と、前記金属基板の表側の面に接触する第2部分とを有する電気化学素子。 - 請求項1~8のいずれか1項に記載の電気化学素子の前記電解質層の上に前記電極層の対極となる対極電極層を設けた固体酸化物形燃料電池セル。
- 金属基板と電極層と電解質層とを有する電気化学素子の製造方法であって、
前記金属基板は表側の面と裏側の面とを貫通して設けられる複数の貫通孔を有しており、
前記金属基板の表側の面の前記貫通孔が設けられた領域より広い領域に電極層を形成する電極層形成ステップと、
前記電極層形成ステップの後に、前記電極層の上と前記金属基板の表側の面の上とにわたって前記電解質層の材料である電解質材料を付着させて、前記電極層を被覆する第1部分と前記金属基板の表側の面に接触する第2部分とを有する電解質層を形成する電解質層形成ステップとを有する電気化学素子の製造方法。 - 前記電極層形成ステップは、
電極層材料を含有する電極層材料ペーストを前記金属基板の表側の面に塗布する予備塗布ステップと、
前記予備塗布ステップの後に、前記貫通孔へ前記電極層材料ペーストを押し込むとともに前記金属基板の表側の面に残留する前記電極層材料ペーストを拭き取る押し込み拭取りステップと、
前記押し込み拭取りステップの後に、前記金属基板の表側の面に前記電極層材料ペーストを塗布する主塗布ステップとを有する請求項10に記載の電気化学素子の製造方法。 - 前記電極層材料ペーストは溶媒によって希釈されており、
前記予備塗布ステップに用いられる電極層材料ペーストの溶媒による希釈率は、前記主塗布ステップに用いられる電極層材料ペーストの溶媒による希釈率に比べて高いことを特徴とする請求項11に記載の電気化学素子の製造方法。 - 前記電極層はサーメット材であり、
前記電極層形成ステップは、前記電極層の材料である電極層材料への骨材の混合比率を異ならせて行う2つのステップを有し、
骨材の混合比率を第1比率とした前記電極層材料を用いて電極層の形成を行う第1形成ステップと、
前記第1形成ステップの後に、骨材の混合比率を前記第1比率よりも大きい第2比率とした電極層材料を用いて電極層の形成を行う第2形成ステップとを有する請求項10~12のいずれか1項に記載の電気化学素子の製造方法。 - 請求項10~13のいずれか1項に記載の電気化学素子の製造方法を実行した後に、前記電解質層の上に前記電極層の対極となる対極電極層を形成する対極電極層形成ステップを有する固体酸化物形燃料電池セルの製造方法。
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EP3196966A4 (en) | 2018-03-28 |
CA2961714C (en) | 2023-02-28 |
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CN107078318B (zh) | 2020-07-31 |
CA2961714A1 (en) | 2016-03-24 |
KR20170057366A (ko) | 2017-05-24 |
US20170309941A1 (en) | 2017-10-26 |
EP3196966A1 (en) | 2017-07-26 |
JP2019220492A (ja) | 2019-12-26 |
EP3444883A1 (en) | 2019-02-20 |
CN107078318A (zh) | 2017-08-18 |
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KR102423540B1 (ko) | 2022-07-20 |
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