WO2012105575A1 - 固体電解質材料およびこれを備えた固体酸化物形燃料電池 - Google Patents
固体電解質材料およびこれを備えた固体酸化物形燃料電池 Download PDFInfo
- Publication number
- WO2012105575A1 WO2012105575A1 PCT/JP2012/052177 JP2012052177W WO2012105575A1 WO 2012105575 A1 WO2012105575 A1 WO 2012105575A1 JP 2012052177 W JP2012052177 W JP 2012052177W WO 2012105575 A1 WO2012105575 A1 WO 2012105575A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- solid electrolyte
- layer
- yttria
- mol
- electrolyte material
- Prior art date
Links
Images
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M8/00—Fuel cells; Manufacture thereof
- H01M8/10—Fuel cells with solid electrolytes
- H01M8/12—Fuel cells with solid electrolytes operating at high temperature, e.g. with stabilised ZrO2 electrolyte
- H01M8/124—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
- 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
- H01M8/1253—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 the electrolyte containing zirconium oxide
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/01—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics
- C04B35/48—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on zirconium or hafnium oxides, zirconates, zircon or hafnates
- C04B35/486—Fine ceramics
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/01—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics
- C04B35/48—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on zirconium or hafnium oxides, zirconates, zircon or hafnates
- C04B35/486—Fine ceramics
- C04B35/488—Composites
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B1/00—Conductors or conductive bodies characterised by the conductive materials; Selection of materials as conductors
- H01B1/06—Conductors or conductive bodies characterised by the conductive materials; Selection of materials as conductors mainly consisting of other non-metallic substances
- H01B1/08—Conductors or conductive bodies characterised by the conductive materials; Selection of materials as conductors mainly consisting of other non-metallic substances oxides
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
- C04B2235/30—Constituents and secondary phases not being of a fibrous nature
- C04B2235/32—Metal oxides, mixed metal oxides, or oxide-forming salts thereof, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
- C04B2235/3217—Aluminum oxide or oxide forming salts thereof, e.g. bauxite, alpha-alumina
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
- C04B2235/30—Constituents and secondary phases not being of a fibrous nature
- C04B2235/32—Metal oxides, mixed metal oxides, or oxide-forming salts thereof, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
- C04B2235/3224—Rare earth oxide or oxide forming salts thereof, e.g. scandium oxide
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
- C04B2235/30—Constituents and secondary phases not being of a fibrous nature
- C04B2235/32—Metal oxides, mixed metal oxides, or oxide-forming salts thereof, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
- C04B2235/3224—Rare earth oxide or oxide forming salts thereof, e.g. scandium oxide
- C04B2235/3225—Yttrium oxide or oxide-forming salts thereof
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
- C04B2235/30—Constituents and secondary phases not being of a fibrous nature
- C04B2235/32—Metal oxides, mixed metal oxides, or oxide-forming salts thereof, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
- C04B2235/3224—Rare earth oxide or oxide forming salts thereof, e.g. scandium oxide
- C04B2235/3227—Lanthanum oxide or oxide-forming salts thereof
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
- C04B2235/30—Constituents and secondary phases not being of a fibrous nature
- C04B2235/32—Metal oxides, mixed metal oxides, or oxide-forming salts thereof, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
- C04B2235/3224—Rare earth oxide or oxide forming salts thereof, e.g. scandium oxide
- C04B2235/3229—Cerium oxides or oxide-forming salts thereof
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
- C04B2235/30—Constituents and secondary phases not being of a fibrous nature
- C04B2235/32—Metal oxides, mixed metal oxides, or oxide-forming salts thereof, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
- C04B2235/327—Iron group oxides, their mixed metal oxides, or oxide-forming salts thereof
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
- C04B2235/50—Constituents or additives of the starting mixture chosen for their shape or used because of their shape or their physical appearance
- C04B2235/54—Particle size related information
- C04B2235/5418—Particle size related information expressed by the size of the particles or aggregates thereof
- C04B2235/5436—Particle size related information expressed by the size of the particles or aggregates thereof micrometer sized, i.e. from 1 to 100 micron
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
- C04B2235/50—Constituents or additives of the starting mixture chosen for their shape or used because of their shape or their physical appearance
- C04B2235/54—Particle size related information
- C04B2235/5418—Particle size related information expressed by the size of the particles or aggregates thereof
- C04B2235/5445—Particle size related information expressed by the size of the particles or aggregates thereof submicron sized, i.e. from 0,1 to 1 micron
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/70—Aspects relating to sintered or melt-casted ceramic products
- C04B2235/74—Physical characteristics
- C04B2235/76—Crystal structural characteristics, e.g. symmetry
- C04B2235/762—Cubic symmetry, e.g. beta-SiC
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/70—Aspects relating to sintered or melt-casted ceramic products
- C04B2235/74—Physical characteristics
- C04B2235/76—Crystal structural characteristics, e.g. symmetry
- C04B2235/765—Tetragonal symmetry
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M8/00—Fuel cells; Manufacture thereof
- H01M8/10—Fuel cells with solid electrolytes
- H01M8/12—Fuel cells with solid electrolytes operating at high temperature, e.g. with stabilised ZrO2 electrolyte
- H01M2008/1293—Fuel cells with solid oxide electrolytes
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M2300/00—Electrolytes
- H01M2300/0017—Non-aqueous electrolytes
- H01M2300/0065—Solid electrolytes
- H01M2300/0068—Solid electrolytes inorganic
- H01M2300/0071—Oxides
- H01M2300/0074—Ion conductive at high temperature
- H01M2300/0077—Ion conductive at high temperature based on zirconium oxide
-
- 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
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/30—Hydrogen technology
- Y02E60/50—Fuel cells
-
- 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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
Definitions
- the present invention relates to a solid electrolyte material and a solid oxide fuel cell including the same.
- SOFC solid oxide fuel cell
- the basic configuration of the SOFC includes a solid electrolyte layer, a fuel electrode layer, and an oxygen electrode layer, and a fuel gas such as hydrogen (H 2 ) flows through and contacts the fuel electrode layer facing one side of the solid electrolyte layer.
- a fuel gas such as hydrogen (H 2 ) flows through and contacts the fuel electrode layer facing one side of the solid electrolyte layer.
- an oxidant gas such as air or oxygen (O 2 ) flows through the oxygen electrode layer facing the opposite side of the electrolyte layer
- oxygen ions (O 2 ⁇ ) generated in the oxygen electrode layer move through the solid electrolyte layer and become fuel.
- O 2 ⁇ reacts with H 2 and an electric output is obtained by an electrochemical reaction.
- the characteristics required for SOFC solid electrolyte materials include (1) high oxygen ion conductivity, (2) excellent long-term durability, and (3) high material strength.
- the most preferable material among the zirconia-based solid electrolyte materials is zirconia in which scandia is dissolved.
- a solid electrolyte material is provided.
- a solid electrolyte material according to the present invention is a solid electrolyte material in which a lanthanoid oxide and / or yttria is dissolved in zirconia (hereinafter referred to as ScSZ) in which scandia is dissolved, Furthermore, it is characterized by containing alumina.
- ScSZ zirconia
- impurities such as Si contained in the fuel gas come into contact with the solid electrolyte layer on the fuel electrode layer side during SOFC operation.
- a solid electrolyte material in which lanthanoid oxide and / or yttria is dissolved in ScSZ means that scandia is dissolved in zirconia and then lanthanoid oxide and / or yttria is dissolved. It is not limited to the prepared solid electrolyte material.
- the order in which scandia and lanthanoid oxide and / or yttria are dissolved in zirconia is not related, and they may be dissolved simultaneously as described in the examples. That is, the solid electrolyte material according to the present invention is a zirconia solid electrolyte material in which scandia, lanthanoid oxide and / or yttria are dissolved, and further contains alumina.
- the zirconia contains scandia with respect to the total amount of substances (total molar amount) of zirconia, scandia, lanthanoid oxide and / or yttria in the solid electrolyte material. 9 to 15 mol%, more preferably 9 to 11 mol%, and lanthanoid oxide and / or yttria are dissolved in 2 to 5 mol%, more preferably 3 to 5 mol%.
- alumina is more than 1 mol% with respect to the total amount of zirconia, scandia, lanthanoid oxide and / or yttria in the solid electrolyte material (total molar amount). Contains. The reason why the amount of scandia is 9 to 15 mol% is that tetragonal crystals may be formed when the amount is less than 9 mol%, and rhombohedral crystals may be formed when the amount exceeds 15 mol%. 2-5 mol% solid solution of lanthanoid oxide and / or yttria is preferable.
- the solid electrolyte material of the present invention preferably contains 5 mol% or less of alumina. This is because when the alumina content is 5 mol% or less, the oxygen ion conductivity of the solid electrolyte material is not lowered or even if it is brought to a minimum.
- the lanthanoid oxide is ceria.
- the reason why ceria is preferable is that not only the scandia extraction due to impurities can be suppressed, but also the oxygen ion conductivity of the solid electrolyte material can be improved.
- an SOFC comprising a solid electrolyte layer, an oxygen electrode layer provided on one surface of the solid electrolyte layer, and a fuel electrode layer provided on the other surface of the solid electrolyte layer.
- the SOFC is characterized in that the solid electrolyte layer is formed of the solid electrolyte material.
- the solid electrolyte layer has a lanthanoid oxide and / or yttria solid solution amount on the fuel electrode side larger than a lanthanoid oxide and / or yttria solid solution amount on the oxygen electrode side.
- the lanthanoid oxide solid solution amount is inclined and decreased from the fuel electrode side to the oxygen electrode side. Thereby, it can suppress to the minimum that oxygen ion conductivity of the whole solid oxide layer falls, preventing pulverization peeling on the fuel electrode layer side.
- the solid electrolyte layer is composed of two layers, a first layer formed on the oxygen electrode layer side and a second layer formed on the fuel electrode layer side,
- the solid solution amount of the lanthanoid oxide and / or yttria in the second layer is larger than the solid solution amount of the lanthanoid oxide and / or yttria in the first layer, and the alumina in the second layer.
- the content of is greater than the content of the alumina in the first layer. More preferably, the lanthanoid oxide and / or yttria are not dissolved in the first layer, and the first layer does not contain the alumina.
- the first layer may be one using scandia-stabilized zirconia or one using yttria-stabilized zirconia.
- the SOFC provided with the present solid electrolyte layer has a high efficiency and a lifetime of 90000 hours required in the popularization period. This is because, in the second layer on the fuel electrode layer side, pulverization and peeling can be prevented, while the ionic conductivity is reduced due to the inclusion of alumina or the like, whereas in the first layer on the oxygen electrode layer side, This is because the oxygen ion conductivity is high and the internal resistance remains small, so that the occurrence of pulverization peeling can be prevented while minimizing the decrease in oxygen ion conductivity of the entire solid electrolyte layer.
- the first layer is formed thicker than the second layer.
- the SOFC provided with the present solid electrolyte layer has a high efficiency and a lifetime of 90000 hours required in the popularization period. This is because the contribution of high oxygen ion conductivity by the first layer is increased by making the thickness of the second layer the minimum necessary to prevent pulverization and peeling, and the power generation efficiency can be further increased. is there.
- the minimum thickness of the second layer necessary for preventing powder peeling is, for example, 1 ⁇ m or more, preferably 3 ⁇ m or more.
- pulverization accompanying zirconia crystal transformation caused when impurities such as Si contained in the fuel gas come into contact with the solid electrolyte layer on the fuel electrode layer side and may occur after tens of thousands of hours
- Solid electrolyte material that suppresses pulverization and separation between the fuel electrode layer and the solid electrolyte layer and has a life of about 90,000 hours, which is required in the popularization period of SOFC, and a solid oxide fuel comprising the same A battery can be provided.
- FIG. 2 shows an SOFC according to an embodiment of the present invention, in which an oxygen electrode layer 101 is provided on one surface of the solid electrolyte layer 102 and a fuel electrode layer 103 is provided on the other surface of the solid electrolyte layer 102.
- a solid electrolyte material in which a lanthanoid oxide and / or yttria is dissolved in ScSZ has been conventionally used as the solid electrolyte layer 102.
- the solid electrolyte layer having a 10Sc1CeSZ composition corresponding to Comparative Example 1 has a cubic structure 110 at the time of manufacture.
- Scandia (Sc 2 O 3 ) which is a stabilizer, is extracted from the crystalline phase by contacting Si or the like in the fuel gas with the solid electrolyte layer, and the crystalline phase is cubic (as shown in the phase diagram of FIG. c) Change from 110 to tetragonal (t) 111.
- the lattice constant decreases and the volume shrinks.
- the grain boundary fracture occurred and powdered like the SEM image of FIG. 1 occurred.
- the amount of lanthanoid oxide and / or yttria solid solution is increased in order to suppress the extraction of scandia (Sc 2 O 3 ) from the crystal phase, and the scandia is extracted from the crystal phase to cause crystal transformation.
- the composition of the solid electrolyte material is preferably 9 to 15 mol% of scandia and lanthanoid oxide with respect to the total amount of zirconia, scandia, and lanthanoid oxide and / or yttria in the solid electrolyte material (total molar amount). And / or 2 to 5 mol% of yttria is dissolved.
- a more preferable composition of the solid electrolyte material of the present invention is more than 1 mol% of alumina with respect to the total amount (total molar amount) of zirconia, scandia, lanthanoid oxide and / or yttria in the solid electrolyte material. It is contained.
- the reason why the amount of scandia is 9 to 15 mol% is that tetragonal crystals may be formed if the amount is less than 9 mol%, and rhombohedral crystals may be formed if the amount exceeds 15 mol%. 2-5 mol% solid solution of lanthanoid oxide and / or yttria is preferable. If it is less than 2 mol%, the effect of suppressing scandia extraction by impurities such as Si contained in the fuel gas is low, and if it exceeds 5 mol%, it is tetragonal. This is because crystal transformation is likely to occur.
- the reason why alumina is contained in an amount of more than 1 mol% is that if it is 1 mol% or less, the effect of suppressing the grain boundary breakage against the volume change accompanying the crystal transformation is small.
- the main problem of the solid electrolyte layer in the SOFC of the present invention is to prevent deterioration due to impurities such as Si in the fuel gas.
- the solid electrolyte layer is on the oxygen electrode layer 101 side.
- the first layer 107 formed on the fuel electrode layer side 103 and the second layer 108 formed on the fuel electrode layer side 103, and the second layer 108 on the fuel electrode layer 103 side comprises ScSZ and lanthanoid oxides.
- the fuel electrode layer 103 in the SOFC of the present invention has high electronic conductivity, O 2 ⁇ reacts with H 2 to obtain an electrical output by an electrochemical reaction, is chemically stable, and has a thermal expansion coefficient of solid. Any material that satisfies conditions close to those of the electrolyte layer 102 may be used, and there is no particular limitation on those used conventionally. Typical examples include Ni and ScSZ cermets, Ni and yttria stabilized zirconia (hereinafter referred to as YSZ) cermets, and Ni and cerium oxide cermets.
- the oxygen electrode layer 101 in the SOFC of the present invention has high electronic conductivity, high catalytic activity for replacing an oxidant gas such as oxygen (O 2 ) with oxygen ions (O 2 ⁇ ), and chemical stability.
- an oxidant gas such as oxygen (O 2 ) with oxygen ions (O 2 ⁇ )
- chemical stability As long as the coefficient of thermal expansion satisfies the conditions close to those of the solid electrolyte layer 102, there is no particular limitation on those used conventionally.
- LSM Lanthanum manganite with solid solution of strontium
- LSF lanthanum ferrite with solid solution of strontium
- LSCF lanthanum cobaltite with solid solution of strontium and iron
- any method usually used in this technical field may be used, and it is not particularly limited.
- zirconia particles, scandia particles, lanthanoid oxide particles and / or yttria particles are mixed at a predetermined mixing ratio, and the mixture is pulverized by a ball mill or the like.
- the solid electrolyte material of the present invention is manufactured by sintering after pulverization with a machine, and then pulverizing the sintered body with a pulverizer such as a ball mill and mixing with alumina and binder components, and molding and sintering the mixture. can do.
- the SOFC of the present invention is manufactured by forming and sintering an oxygen electrode layer on one surface of the solid electrolyte material of the present invention and a fuel electrode layer on the other surface using a screen printing method or the like. Can do.
- the SOFC of the present invention may be of any type such as a flat plate stripe type, a flat plate horizontal stripe type, a flat cylindrical type, a cylindrical vertical stripe type, a cylindrical horizontal stripe type, and a microtube.
- Example 1 A description will be given of the production and testing of the type 2 cell.
- ZrO 2 raw material (average particle size 0.3 ⁇ m), Sc 2 O 3 raw material (average particle size 0.3 ⁇ m), CeO 2 raw material (average particle size 0.3 ⁇ m) are represented by the general formula 89 mol% (ZrO 2 ) -10 mol% (Sc 2 O 3 ) Weighed so as to obtain a 10Sc1CeSZ composition represented by -1 mol% (CeO 2 ), wet-mixed in a solvent ethanol for 50 hr, dried and pulverized, and sintered at 1200 ° C.
- Al 2 O 3 (average particle size 0.5 ⁇ m) is added to the total amount of zirconia, scandia, lanthanoid oxide and / or yttria in the solid electrolyte material (
- the binder PVA was added in an amount of 1 mol% with respect to the total molar amount) and 5 wt% with respect to the powder, and mixed in a mortar.
- the PVA-containing powder was press-molded at 50 MPa, and sintered at 1450 ° C. for 5 hours. A dense solid electrolyte layer of 10Sc1CeSZ1Al composition was obtained.
- LSM average particle size 2 ⁇ m
- a cermet of Ni and YSZ as a fuel electrode layer on the opposite side 40 wt% NiO-60 wt% YSZ (average particle diameter 2 ⁇ m) was formed by screen printing so that the thickness after sintering was 20 ⁇ m, and sintered at 1400 ° C. for 2 hr.
- Example 2 Formula 89 mol% of (ZrO 2) -10mol% (Sc 2 O 3) -1mol% Al 2 O 3 in 10Sc1CeSZ composition represented by (CeO 2), zirconia solid electrolyte material, and scandia, lanthanide oxide
- Example 2 was the same as Example 1 except that 2 mol% of the total material amount (total molar amount) with the product and / or yttria was mixed to obtain a dense solid electrolyte layer having a 10Sc1CeSZ2Al composition.
- Example 3 Al 2 O 3 in 10Sc3CeSZ composition represented by general formula 87mol% (ZrO 2 ) -10mol% (Sc 2 O 3 ) -3mol% (CeO 2 ), zirconia, scandia and lanthanoid oxidation in solid electrolyte materials 2 mol% was mixed with respect to the total amount of substances and / or yttria (total molar amount) to obtain a dense solid electrolyte layer having a 10Sc3CeSZ2Al composition.
- Example 4 Al 2 O 3 in 10Sc3CeSZ composition represented by the general formula 87mol% (ZrO 2 ) -10mol% (Sc 2 O 3 ) -3mol% (CeO 2 ), zirconia, scandia and lanthanoid oxidation in solid electrolyte materials
- the same procedure as in Example 1 was conducted except that the equivalent amount of 5 mol% was mixed with the total amount of substances and / or yttria (total molar amount) to obtain a dense solid electrolyte layer having a composition of 10Sc3CeSZ5Al.
- Example 5 Al 2 O 3 in 10Sc5CeSZ composition represented by the general formula 85mol% (ZrO 2 ) -10mol% (Sc 2 O 3 ) -5mol% (CeO 2 ), zirconia, scandia and lanthanoid oxidation in solid electrolyte materials 2 mol% was mixed with the total amount of substances and / or yttria (total molar amount) to obtain a dense solid electrolyte layer having a 10Sc5CeSZ2Al composition.
- Example 6 Al 2 O 3 in 10Sc6CeSZ composition represented by the general formula 84mol% (ZrO 2 ) -10mol% (Sc 2 O 3 ) -6mol% (CeO 2 ), zirconia in the solid electrolyte material, scandia, and lanthanoid oxidation
- Example 7 Formula 89 mol% of (ZrO 2) -8mol% (Sc 2 O 3) -3mol% Al 2 O 3 in 8Sc3CeSZ composition represented by (CeO 2), zirconia solid electrolyte material, and scandia, lanthanide oxide 2 mol% with respect to the total amount of substances and / or yttria (total molar amount) to obtain a dense solid electrolyte layer having an 8Sc3CeSZ2Al composition.
- Example 8 General formula 88mol% (ZrO 2 ) -9mol% (Sc 2 O 3 ) -3mol% (CeO 2 ) 9Sc3CeSZ composition Al 2 O 3 , zirconia in solid electrolyte material, scandia, lanthanoid oxidation Example 2 was the same as Example 1 except that 2 mol% of the total substance amount (total molar amount) with the product and / or yttria was mixed to obtain a dense solid electrolyte layer having a 9Sc3CeSZ2Al composition.
- Example 9 Al 2 O 3 in the 15Sc3CeSZ composition represented by the general formula 82mol% (ZrO 2 ) -15mol% (Sc 2 O 3 ) -3mol% (CeO 2 ), zirconia in the solid electrolyte material, scandia, and lanthanoid oxidation 2 mol% was mixed with the total amount of substances and / or yttria (total molar amount) to obtain a dense solid electrolyte layer having a 15Sc3CeSZ2Al composition.
- Example 10 Al 2 O 3 in the 16Sc3CeSZ composition represented by the general formula 81mol% (ZrO 2 ) -16mol% (Sc 2 O 3 ) -3mol% (CeO 2 ), zirconia in the solid electrolyte material, scandia, and lanthanoid oxidation 2 mol% was mixed with the total amount of substances and / or yttria (total molar amount) to obtain a dense solid electrolyte layer having a 16Sc3CeSZ2Al composition.
- Example 2 The same as Example 1 except that a dense solid electrolyte layer was obtained without adding Al 2 O 3 to the 10ScSZ composition represented by the general formula 90 mol% (ZrO 2 ) -10 mol% (Sc 2 O 3 ). did.
- Fig. 6 shows an outline of the test equipment.
- a glass seal (SiO 2 + B 2 O 3 ) 104 was placed on the apparatus held by the zirconia tube 105, and the fabricated SOFC 100 was placed thereon. Furthermore, a zirconia tube 105 was placed on the upper surface of the SOFC100.
- the temperature of the electric furnace 106 was increased to 1000 ° C. while flowing Air on the upper surface of the SOFC and 97% N 2 + 3% H 2 on the lower surface.
- Table 1 shows the test results.
- the notation is c: cubic, t: tetragonal, and r: rhombohedral. While all of Comparative Examples 1 to 3 were confirmed to be powdered, Examples 1 to 10 were not powdered. From this, it was confirmed that powdering can be suppressed by adopting the composition of the present invention.
- the crystal phase was transformed into the t phase in Examples 1, 2, 6, and 7, whereas in Example 10, the r phase that caused the phase transformation was left in the vicinity of 630 ° C., whereas Examples 3, 4, 5, 8, and 9 remained in the c phase.
- Table 2 shows the analysis results. Although powdering was not observed in the solid electrolyte layer covered with the fuel electrode layer, in Comparative Example 1, the crystal phase had already changed to the t phase, and cracks were confirmed at the grain boundaries. On the other hand, in Examples 2 and 3, there was no powdering, the crystal phase was not changed, and no cracks were observed at the grain boundaries. In the case of Comparative Example 1, it was suggested that pulverization occurred after a longer operation, and that the fuel electrode layer 103 and the solid electrolyte layer 102 might be pulverized and separated.
- Lanthanoid oxides other than CeO 2 and yttria (Example 11) Al 2 O 3 in a 10Sc3YSZ composition represented by the general formula 87 mol% (ZrO 2 ) -10 mol% (Sc 2 O 3 ) -3 mol% (Sm 2 O 3 ), zirconia in a solid electrolyte material, scandia, The same procedure as in Example 1 was performed except that 2 mol% of the total amount of the lanthanoid oxide and / or yttria (total molar amount) was mixed to obtain a dense solid electrolyte layer having a 10Sc3SmSZ2Al composition.
- Example 12 Al 2 O 3 in a 10Sc3YbSZ composition represented by the general formula 87 mol% (ZrO 2 ) -10 mol% (Sc 2 O 3 ) -3 mol% (Yb 2 O 3 ), zirconia in a solid electrolyte material, scandia,
- the same procedure as in Example 1 was performed except that 2 mol% of the total amount (total molar amount) of the lanthanoid oxide and / or yttria was mixed to obtain a dense solid electrolyte layer having a 10Sc3YbSZ2Al composition.
- Example 13 Al 2 O 3 in a 10Sc3LaSZ composition represented by the general formula 87 mol% (ZrO 2 ) -10 mol% (Sc 2 O 3 ) -3 mol% (La 2 O 3 ), zirconia in a solid electrolyte material, scandia,
- the same procedure as in Example 1 was conducted except that 2 mol% of the total amount of lanthanoid oxide and / or yttria (total molar amount) was mixed to obtain a dense solid electrolyte layer having a 10Sc3LaSZ2Al composition.
- Example 14 Al 2 O 3 in the 10Sc3YSZ composition represented by the general formula 87 mol% (ZrO 2 ) -10 mol% (Sc 2 O 3 ) -3 mol% (Y 2 O 3 ), zirconia in the solid electrolyte material, scandia,
- the same procedure as in Example 1 was conducted, except that 2 mol% of the total amount of the lanthanoid oxide and / or yttria (total molar amount) was mixed to obtain a dense solid electrolyte layer having a 10Sc3YSZ2Al composition.
- the electric furnace 106 was heated to 1000 ° C. while flowing Air on the SOFC upper surface of Examples 11 to 14 and 97% N 2 + 3% H 2 on the lower surface. Hold air at 1000 ° C for 600 hours while flowing air on the upper surface of the SOFC and fuel gas (70% H 2 + 30% H 2 O) on the lower surface, then air on the upper surface of the SOFC and 97% N 2 + 3% H 2 on the lower surface. The temperature was lowered to room temperature while flowing. Similarly, the surface of the solid electrolyte layer 102 of SOFC 100 in contact with the glass seal 104 was analyzed by SEM and Raman spectroscopy, and the presence or absence of powdering and the crystal phase were confirmed.
- Table 3 shows the analysis results after the test. In all of Examples 11 to 14, no pulverization was observed, and the crystal phase remained as the c phase. This result was the same as in Example 3. It was confirmed that even when a lanthanoid oxide other than CeO 2 or yttria was dissolved, the same effect as when CeO 2 was dissolved was confirmed.
- the electrical conductivity of the solid electrolyte materials of Examples 3, 11, 12, 13, and 14 was measured. Each solid electrolyte material was press-molded and sintered at 1450 ° C. for 5 hours, and then a platinum electrode was attached to both sides and a reference electrode was attached to the side surface, and impedance measurement was performed at 1000 ° C. in an air atmosphere.
- Table 4 shows the conductivity results. It was confirmed that Example 3 had the highest conductivity, and ceria was most preferable as the lanthanoid oxide to be dissolved.
- Solid electrolyte layer two-layer structure (Example 15) (1) Preparation of the first layer ZrO 2 raw material (average particle size 0.3 ⁇ m), Sc 2 O 3 raw material (average particle size 0.3 ⁇ m), CeO 2 raw material (average particle size 0.3 ⁇ m) are represented by the general formula 90 mol% (ZrO 2 ) Weighed so as to have a 10ScSZ composition represented by ⁇ 10 mol% (Sc 2 O 3 ), wet-mixed in a solvent ethanol for 50 hr, dried and pulverized, and sintered at 1200 ° C. The sintered body was pulverized into powder, and 5 wt% of binder PVA was added to the powder and mixed in a mortar. The PVA-containing powder was press-molded at 50 MPa to produce a molded body having a 10Sc1CeSZ1Al composition.
- Second layer ZrO 2 raw material (average particle size 0.3 ⁇ m), Sc 2 O 3 raw material (average particle size 0.3 ⁇ m), and CeO 2 raw material (average particle size 0.3 ⁇ m) are represented by the general formula 87 mol% (ZrO 2) -10mol% (Sc 2 O 3) -3mol% ( weighed so as to 10Sc3CeSZ composition represented by CeO 2), and 50hr wet mixing in a solvent of ethanol, sintered at 1200 ° C. after drying and milling I let you.
- Al 2 O 3 (average particle size 0.5 ⁇ m) is added to the total amount of zirconia, scandia, lanthanoid oxide and / or yttria in the second layer.
- 2 mol% equivalent and 5 wt% of binder PVA was added to the powder with respect to (total molar amount) and mixed in a mortar.
- the PVA-containing powder was press-molded at 50 MPa to produce a compact with a 10Sc3CeSZ2Al composition.
- a film is formed by screen printing so that 40 wt% NiO-60 wt% YSZ (average particle size 2 ⁇ m) is formed as a fuel electrode layer on the surface of the second layer to a thickness of 20 ⁇ m after sintering.
- the film was formed by screen printing so that it was sintered at 1400 ° C. for 2 hours.
- the composition of the first layer is Al 2 O 3 (average particle size 0.5 ⁇ m) with a 10Sc1CeSZ composition represented by the general formula 89 mol% (ZrO 2 ) -10 mol% (Sc 2 O 3 ) -1 mol% (CeO 2 ) was added in an amount equivalent to 1 mol% with respect to the total amount of zirconia, scandia, and lanthanoid oxide and / or yttria in the first layer (total molar amount). It was.
- an electric furnace was allowed to flow air on the SOFC upper surface (first layer side) of Examples 15 and 16 and 97% N 2 + 3% H 2 on the lower surface (second layer side).
- 106 was heated to 1000 ° C. Hold the air on the SOFC upper surface (first layer side) and fuel gas (70% H 2 + 30% H 2 O) on the lower surface for 600 hours at 1000 ° C, then air on the SOFC upper surface (first layer side) The bottom surface was lowered to room temperature while 97% N 2 + 3% H 2 was allowed to flow.
- the surface of the SOFC100 solid electrolyte layer 102 in contact with the glass seal 104 was analyzed by SEM and Raman spectroscopy to confirm the presence or absence of powdering and the crystalline phase, and compared with Example 3. .
- Table 5 shows the analysis results after the test. In all of Examples 15 and 16, no pulverization was observed, and the crystal phase remained as the c phase. It was confirmed that powdering and crystal transformation can be suppressed by adopting an electrolyte two-layer structure, the first layer having the composition of Comparative Examples 1 and 2, and the second layer having the composition of Example 3.
- the electrical conductivity of the solid electrolyte materials of Examples 3, 15, and 16 was measured.
- Each solid electrolyte material was press-molded and sintered at 1450 ° C. for 5 hours, platinum electrodes were attached to both sides, reference electrodes were attached to the side surfaces, and impedance measurement was performed in an air atmosphere at 1000 ° C.
- Table 6 shows the conductivity results. It was confirmed that by providing a layer having high oxygen ion conductivity in the first layer, the conductivity was higher than that of Example 3 and the power generation efficiency was improved. From the above, it was confirmed that it was more effective to form the second layer with a minimum thickness necessary for preventing powder peeling.
- Example 17 The composition of the first layer was the same as that of Example 15 except that Al 2 O 3 was not added to the 10YSZ composition represented by the general formula 90 mol% (ZrO 2 ) -10 mol% (Y 2 O 3 ). did.
- Table 7 shows the analysis results after the test. Also in Example 17, no pulverization was observed, and the crystal phase remained in the c phase. Even if the electrolyte has a two-layer structure, and the first layer uses yttria as a stabilizer, the same effect can be confirmed by forming the second layer with the solid electrolyte material of the present invention. It was.
- the SOFC design has been described as a flat plate type, but any type such as a flat cylindrical type, a cylindrical vertical stripe type, and a micro tube has the same effect.
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Ceramic Engineering (AREA)
- Composite Materials (AREA)
- Organic Chemistry (AREA)
- Structural Engineering (AREA)
- Materials Engineering (AREA)
- Sustainable Energy (AREA)
- General Chemical & Material Sciences (AREA)
- Electrochemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Sustainable Development (AREA)
- Life Sciences & Earth Sciences (AREA)
- Fuel Cell (AREA)
- Compositions Of Oxide Ceramics (AREA)
- Conductive Materials (AREA)
Abstract
Description
なお、本明細書で言う「ScSZにランタノイド酸化物および/またはイットリアが固溶された固体電解質材料」とは、ジルコニアにスカンジアを固溶させ、次いでランタノイド酸化物および/またはイットリアを固溶させて調製された固体電解質材料に限定されるものではない。本発明の固体電解質材料において、ジルコニアにスカンジアとランタノイド酸化物および/またはイットリアとを固溶させる順序は関係なく、また実施例に記載の通りそれらを同時に固溶させてもよい。即ち、本発明に係る固体電解質材料は、スカンジアと、ランタノイド酸化物および/またはイットリアとが固溶されたジルコニア固体電解質材料であって、更にアルミナを含有することを特徴とするものである。
本発明のSOFCは、平板縦縞型、平板横縞型、扁平円筒型、円筒縦縞型、円筒横縞型、マイクロチューブなどのいずれのタイプであってもよい。
図2タイプのセルを製作し試験を行ったので説明する。ZrO2原料(平均粒径0.3μm)、Sc2O3原料(平均粒径0.3μm)、CeO2原料(平均粒径0.3μm)を一般式89mol%(ZrO2)-10mol%(Sc2O3)-1mol%(CeO2) で表される10Sc1CeSZ組成になるように秤量し、溶媒エタノールの中で50hr湿式混合し、乾燥および粉砕後1200℃で焼結させた。該焼結体を粉砕して粉末にした後、Al2O3(平均粒径0.5μm)を、固体電解質材料中のジルコニアと、スカンジアと、ランタノイド酸化物および/またはイットリアとの総物質量(総モル量)に対して、1mol%相当と、バインダーPVAを前記粉末に対して5wt%加え、乳鉢で混合した。50MPaで前記PVAを含んだ粉末をプレス成形し、1450℃で5hr焼結させた。10Sc1CeSZ1Al組成の緻密質な固体電解質層を得た。厚み200μm程度まで研磨した後、酸素極層としてLSM(平均粒径2μm)を焼結後の厚みが20μmになるようスクリーン印刷で成膜し、反対面に燃料極層としてNiとYSZのサーメットになるよう40wt%NiO―60wt%YSZ(平均粒径2μm)を焼結後の厚みが20μmになるようスクリーン印刷で成膜し、1400℃で2hr焼結させた。
一般式89mol%(ZrO2)-10mol%(Sc2O3)-1mol%(CeO2) で表される10Sc1CeSZ組成にAl2O3を、固体電解質材料中のジルコニアと、スカンジアと、ランタノイド酸化物および/またはイットリアとの総物質量(総モル量)に対して、2mol%相当混ぜ合わせ、10Sc1CeSZ2Al組成の緻密質な固体電解質層を得たこと以外は実施例1と同様とした。
一般式87mol%(ZrO2)-10mol%(Sc2O3)-3mol%(CeO2) で表される10Sc3CeSZ組成にAl2O3を、固体電解質材料中のジルコニアと、スカンジアと、ランタノイド酸化物および/またはイットリアとの総物質量(総モル量)に対して、2mol%相当混ぜ合わせ、10Sc3CeSZ2Al組成の緻密質な固体電解質層を得たこと以外は実施例1と同様とした。
一般式87mol%(ZrO2)-10mol%(Sc2O3)-3mol%(CeO2) で表される10Sc3CeSZ組成にAl2O3を、固体電解質材料中のジルコニアと、スカンジアと、ランタノイド酸化物および/またはイットリアとの総物質量(総モル量)に対して、5mol%相当混ぜ合わせ、10Sc3CeSZ5Al組成の緻密質な固体電解質層を得たこと以外は実施例1と同様とした。
一般式85mol%(ZrO2)-10mol%(Sc2O3)-5mol%(CeO2) で表される10Sc5CeSZ組成にAl2O3を、固体電解質材料中のジルコニアと、スカンジアと、ランタノイド酸化物および/またはイットリアとの総物質量(総モル量)に対して、2mol%相当混ぜ合わせ、10Sc5CeSZ2Al組成の緻密質な固体電解質層を得たこと以外は実施例1と同様とした。
一般式84mol%(ZrO2)-10mol%(Sc2O3)-6mol%(CeO2) で表される10Sc6CeSZ組成にAl2O3を、固体電解質材料中のジルコニアと、スカンジアと、ランタノイド酸化物および/またはイットリアとの総物質量(総モル量)に対して、2mol%相当混ぜ合わせ、10Sc6CeSZ2Al組成の緻密質な固体電解質層を得たこと以外は実施例1と同様とした。
一般式89mol%(ZrO2)-8mol%(Sc2O3)-3mol%(CeO2) で表される8Sc3CeSZ組成にAl2O3を、固体電解質材料中のジルコニアと、スカンジアと、ランタノイド酸化物および/またはイットリアとの総物質量(総モル量)に対して、2mol%相当混ぜ合わせ、8Sc3CeSZ2Al組成の緻密質な固体電解質層を得たこと以外は実施例1と同様とした。
一般式88mol%(ZrO2)-9mol%(Sc2O3)-3mol%(CeO2) で表される9Sc3CeSZ組成にAl2O3を、固体電解質材料中のジルコニアと、スカンジアと、ランタノイド酸化物および/またはイットリアとの総物質量(総モル量)に対して、2mol%相当混ぜ合わせ、9Sc3CeSZ2Al組成の緻密質な固体電解質層を得たこと以外は実施例1と同様とした。
一般式82mol%(ZrO2)-15mol%(Sc2O3)-3mol%(CeO2) で表される15Sc3CeSZ組成にAl2O3を、固体電解質材料中のジルコニアと、スカンジアと、ランタノイド酸化物および/またはイットリアとの総物質量(総モル量)に対して、2mol%相当混ぜ合わせ、15Sc3CeSZ2Al組成の緻密質な固体電解質層を得たこと以外は実施例1と同様とした。
一般式81mol%(ZrO2)-16mol%(Sc2O3)-3mol%(CeO2) で表される16Sc3CeSZ組成にAl2O3を、固体電解質材料中のジルコニアと、スカンジアと、ランタノイド酸化物および/またはイットリアとの総物質量(総モル量)に対して、2mol%相当混ぜ合わせ、16Sc3CeSZ2Al組成の緻密質な固体電解質層を得たこと以外は実施例1と同様とした。
一般式89mol%(ZrO2)-10mol%(Sc2O3)-1mol%(CeO2) で表される10Sc1CeSZ組成にAl2O3を添加しないで緻密質な固体電解質層を得たこと以外は実施例1と同様とした。
一般式90mol%(ZrO2)-10mol%(Sc2O3)で表される10ScSZ組成にAl2O3を添加しないで緻密質な固体電解質層を得たこと以外は実施例1と同様とした。
一般式90mol%(ZrO2)-10mol%(Sc2O3)で表される10ScSZ組成にAl2O3を、固体電解質材料中のジルコニアと、スカンジアと、ランタノイド酸化物および/またはイットリアとの総物質量(総モル量)に対して、1mol%相当添加し、10ScSZ1Al組成の緻密質な固体電解質層を得たこと以外は実施例1と同様とした。
図6に試験装置の概略を示す。ジルコニアチューブ105で保持された装置にガラスシール(SiO2+B2O3)104を置き、その上に作製したSOFC100を乗せた。さらにSOFC100の上面にジルコニアチューブ105を乗せた。実施例1~10および比較例1~3のSOFC上面にAirを、下面に97%N2+3%H2を流しながら電気炉106を1000℃まで昇温した。SOFC上面にAirを、下面に燃料ガス(70%H2+30%H2O)を流しながら1000℃で600hr保持した後、SOFC上面にAirを、下面に97%N2+3%H2を流しながら室温まで下げた。
SOFC100をガラスシール104から引き剥がした後、ガラスシールと接触したSOFC100の固体電解質層102表面をSEMおよびラマン分光法で分析し、粉末化の有無および結晶相を確認した。また、すべてのSOFCに対して試験前にラマン分光法で結晶相を確認した。
実施例2と実施例3および比較例1のSOFCについては、燃料極層103を剥がし、燃料極層103で覆われていた固体電解質層102表面についてSEMおよびラマン分光法で分析した。
(実施例11)
一般式87mol%(ZrO2)-10mol%(Sc2O3)-3mol%(Sm2O3) で表される10Sc3YSZ組成にAl2O3を、固体電解質材料中のジルコニアと、スカンジアと、ランタノイド酸化物および/またはイットリアとの総物質量(総モル量)に対して、2mol%相当混ぜ合わせ、10Sc3SmSZ2Al組成の緻密質な固体電解質層を得たこと以外は実施例1と同様とした。
一般式87mol%(ZrO2)-10mol%(Sc2O3)-3mol%(Yb2O3) で表される10Sc3YbSZ組成にAl2O3を、固体電解質材料中のジルコニアと、スカンジアと、ランタノイド酸化物および/またはイットリアとの総物質量(総モル量)に対して、2mol%相当混ぜ合わせ、10Sc3YbSZ2Al組成の緻密質な固体電解質層を得たこと以外は実施例1と同様とした。
一般式87mol%(ZrO2)-10mol%(Sc2O3)-3mol%(La2O3) で表される10Sc3LaSZ組成にAl2O3を、固体電解質材料中のジルコニアと、スカンジアと、ランタノイド酸化物および/またはイットリアとの総物質量(総モル量)に対して、2mol%相当混ぜ合わせ、10Sc3LaSZ2Al組成の緻密質な固体電解質層を得たこと以外は実施例1と同様とした。
一般式87mol%(ZrO2)-10mol%(Sc2O3)-3mol%(Y2O3) で表される10Sc3YSZ組成にAl2O3を、固体電解質材料中のジルコニアと、スカンジアと、ランタノイド酸化物および/またはイットリアとの総物質量(総モル量)に対して、2mol%相当混ぜ合わせ、10Sc3YSZ2Al組成の緻密質な固体電解質層を得たこと以外は実施例1と同様とした。
(実施例15)
(1)第一の層の作製
ZrO2原料(平均粒径0.3μm),Sc2O3原料(平均粒径0.3μm),CeO2原料(平均粒径0.3μm)を一般式90mol%(ZrO2)-10mol%(Sc2O3)で表される10ScSZ組成になるように秤量し、溶媒エタノールの中で50hr湿式混合し、乾燥および粉砕後1200℃で焼結させた。該焼結体を粉砕して粉末にした後、バインダーPVAを前記粉末に対して5wt%加え、乳鉢で混合した。50MPaで前記PVAを含んだ粉末をプレス成形し、10Sc1CeSZ1Al組成の成形体を作製した。
ZrO2原料(平均粒径0.3μm),Sc2O3原料(平均粒径0.3μm),CeO2原料(平均粒径0.3μm)を一般式87mol%(ZrO2)-10mol%(Sc2O3)-3mol%(CeO2) で表される10Sc3CeSZ組成になるように秤量し、溶媒エタノールの中で50hr湿式混合し、乾燥および粉砕後1200℃で焼結させた。該焼結体を粉砕して粉末にした後、Al2O3(平均粒径0.5μm)を、第二の層中のジルコニアと、スカンジアと、ランタノイド酸化物および/またはイットリアとの総物質量(総モル量)に対して、2mol%相当およびバインダーPVAを前記粉末に対して5wt%加え、乳鉢で混合した。50MPaで前記PVAを含んだ粉末をプレス成形し、10Sc3CeSZ2Al組成の成形体を作製した。
10Sc1CeSZ1Al組成からなる第一の層の成形体と10Sc3CeSZ2Al組成からなる第二の層の成形体を積層し熱圧着させた後、1450℃で5hr焼結させた。第一の層の厚みが190μm、第二の層が10μm程度になるよう研磨した後、第一の層の表面に酸素極層としてLSM(平均粒径2μm)を焼結後の厚みが20μmになるようスクリーン印刷で成膜し、第二の層の表面に燃料極層としてNiとYSZのサーメットになるよう40wt%NiO―60wt%YSZ(平均粒径2μm)を焼結後の厚みが20μmになるようスクリーン印刷で成膜し、1400℃で2hr焼結させた。
第一の層の組成を、一般式89mol%(ZrO2)-10mol%(Sc2O3)-1mol%(CeO2) で表される10Sc1CeSZ組成にAl2O3(平均粒径0.5μm)を、第一層中のジルコニアと、スカンジアと、ランタノイド酸化物および/またはイットリアとの総物質量(総モル量)に対して、1mol%相当添加したものにしたこと以外は実施例15と同様とした。
第一の層の組成を一般式90mol%(ZrO2)-10mol%(Y2O3)で表される10YSZ組成にAl2O3を添加しないものにしたこと以外は実施例15と同様とした。
101 酸素極層
102 固体電解質層
103 燃料極層
104 ガラスシール(SiO2+B2O3)
105 ジルコニアチューブ
106 電気炉
107 固体電解質層(第一の層)
108 固体電解質層(第二の層)
110 10Sc1CeSZ(立方晶)
111 10Sc1CeSZ(正方晶)
112 アルミナ(Al2O3)
Claims (9)
- スカンジアと、ランタノイド酸化物および/またはイットリアとが固溶されたジルコニア固体電解質材料であって、更にアルミナを含有することを特徴とする固体電解質材料。
- 固体電解質材料中のジルコニアと、スカンジアと、ランタノイド酸化物および/またはイットリアとの総モル量に対して、前記スカンジアが9~15mol%、前記ランタノイド酸化物および/またはイットリアが2~5mol%固溶されることを特徴とする請求項1に記載の固体電解質材料。
- 固体電解質材料中のジルコニアと、スカンジアと、ランタノイド酸化物および/またはイットリアとの総モル量に対して、前記アルミナを1mol%より多く含有することを特徴とする請求項2に記載の固体電解質材料。
- 前記ランタノイド酸化物は、セリアであることを特徴とする、請求項2に記載の固体電解質材料。
- 固体電解質層と、前記固体電解質層の一方の面に設けられた酸素極層と、前記固体電解質層の他方の面に設けられた燃料極層とを備える固体酸化物形燃料電池であって、前記固体電解質層は、請求項1乃至4のいずれか1項に記載の固体電解質材料を含むことを特徴とする固体酸化物形燃料電池。
- 前記固体電解質層は、前記燃料極側におけるランタノイド酸化物および/またはイットリアの固溶量が、前記酸素極側における前記ランタノイド酸化物および/またはイットリアの固溶量よりも大きいことを特徴とする請求項5に記載の固体酸化物形燃料電池。
- 前記固体電解質層は、前記酸素極層側に形成された第一の層と、前記燃料極層側に形成された第二の層との二層からなり、前記第二の層における前記ランタノイド酸化物および/またはイットリアの固溶量は、前記第一の層における前記ランタノイド酸化物および/またはイットリアの固溶量よりも大きく、前記第二の層における前記アルミナの含有量は、前記第一の層における前記アルミナの含有量よりも大きいことを特徴とする請求項5に記載の固体酸化物形燃料電池。
- 前記第一の層は、前記ランタノイド酸化物および/またはイットリアが固溶しておらず、且つ前記アルミナを含有していないことを特徴とする請求項7に記載の固体酸化物形燃料電池。
- 前記第一の層は、前記第二の層よりも厚く形成されていることを特徴とする請求項8に記載の固体酸化物形燃料電池。
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP12742321.8A EP2672556B1 (en) | 2011-01-31 | 2012-01-31 | Solid electrolyte material and solid oxide fuel cell provided with same |
CN201280016250.3A CN103477483B (zh) | 2011-01-31 | 2012-01-31 | 固体电解质材料及具备该固体电解质材料的固体氧化物型燃料电池 |
JP2012555911A JP5652752B2 (ja) | 2011-01-31 | 2012-01-31 | 固体電解質材料およびこれを備えた固体酸化物形燃料電池 |
US13/983,014 US20130316267A1 (en) | 2011-01-31 | 2012-01-31 | Solid electrolyte material and solid oxide fuel cell provided the same |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2011-018760 | 2011-01-31 | ||
JP2011018760 | 2011-01-31 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2012105575A1 true WO2012105575A1 (ja) | 2012-08-09 |
Family
ID=46602782
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2012/052177 WO2012105575A1 (ja) | 2011-01-31 | 2012-01-31 | 固体電解質材料およびこれを備えた固体酸化物形燃料電池 |
Country Status (5)
Country | Link |
---|---|
US (1) | US20130316267A1 (ja) |
EP (1) | EP2672556B1 (ja) |
JP (1) | JP5652752B2 (ja) |
CN (1) | CN103477483B (ja) |
WO (1) | WO2012105575A1 (ja) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2016115600A (ja) * | 2014-12-17 | 2016-06-23 | 株式会社日本触媒 | メタルサポートセル |
WO2022208705A1 (ja) * | 2021-03-31 | 2022-10-06 | 株式会社日立ハイテク | 燃料電池セルおよびその製造方法 |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP6669045B2 (ja) * | 2016-11-15 | 2020-03-18 | 株式会社デンソー | ガスセンサ素子用固体電解質体とその製造方法及びガスセンサ素子 |
CN110856455B (zh) * | 2017-06-30 | 2023-08-29 | 第一稀元素化学工业株式会社 | 氧化钪稳定化氧化锆粉末、烧结体、制造方法和燃料电池 |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH1066916A (ja) * | 1996-07-30 | 1998-03-10 | Eastman Kodak Co | 多層塗布装置および方法 |
JP2002134131A (ja) * | 2000-10-23 | 2002-05-10 | Toho Gas Co Ltd | 支持膜式固体電解質型燃料電池 |
JP2005322547A (ja) * | 2004-05-11 | 2005-11-17 | Toho Gas Co Ltd | 低温作動型固体酸化物形燃料電池単セル |
JP2008305804A (ja) | 2008-07-28 | 2008-12-18 | Toho Gas Co Ltd | 高イオン導電性固体電解質材料及びその製造方法、焼結体、固体電解質型燃料電池 |
JP2010027359A (ja) * | 2008-07-18 | 2010-02-04 | Nippon Shokubai Co Ltd | リサイクルジルコニア粉末の製造方法、当該製造方法によるリサイクルジルコニア粉末、およびそれを用いたジルコニア焼結体の製造方法 |
Family Cites Families (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP3339670B2 (ja) * | 1996-08-28 | 2002-10-28 | 日本電信電話株式会社 | 希土類酸化物及びSc2O3,Al2O3添加ZrO2系固体電解質材料 |
JP3777903B2 (ja) * | 1998-10-14 | 2006-05-24 | 三菱マテリアル株式会社 | 電極−電解質間に傾斜組成を持つ固体酸化物型燃料電池 |
JP2000340240A (ja) * | 1999-05-31 | 2000-12-08 | Toho Gas Co Ltd | 高イオン導電性固体電解質材料及びそれを用いた固体電解質型燃料電池 |
US6558831B1 (en) * | 2000-08-18 | 2003-05-06 | Hybrid Power Generation Systems, Llc | Integrated SOFC |
DE10212966B4 (de) * | 2002-03-22 | 2006-08-03 | Siemens Ag | Hochtemperatur-Brennstoffzelle und Verfahren zu deren Herstellung |
JP4524791B2 (ja) * | 2002-08-06 | 2010-08-18 | Toto株式会社 | 固体酸化物形燃料電池 |
WO2005017226A1 (en) * | 2003-01-10 | 2005-02-24 | University Of Connecticut | Coatings, materials, articles, and methods of making thereof |
US20060166070A1 (en) * | 2003-09-10 | 2006-07-27 | Ion America Corporation | Solid oxide reversible fuel cell with improved electrode composition |
US7618731B2 (en) * | 2003-12-17 | 2009-11-17 | University Of Dayton | Ceramic-ceramic nanocomposite electrolyte |
CN100353588C (zh) * | 2005-12-26 | 2007-12-05 | 潮州三环(集团)股份有限公司 | 一种固体氧化物燃料电池电解质隔膜的制备方法 |
US7820332B2 (en) * | 2006-09-27 | 2010-10-26 | Corning Incorporated | Electrolyte sheet with regions of different compositions and fuel cell device including such |
DK2378599T3 (da) * | 2006-11-23 | 2013-01-14 | Univ Denmark Tech Dtu | Fremgangsmåde til fremstilling af reversible fastoxidceller |
WO2008127601A1 (en) * | 2007-04-13 | 2008-10-23 | Bloom Energy Corporation | Heterogeneous ceramic composite sofc electrolyte |
-
2012
- 2012-01-31 EP EP12742321.8A patent/EP2672556B1/en not_active Not-in-force
- 2012-01-31 JP JP2012555911A patent/JP5652752B2/ja not_active Expired - Fee Related
- 2012-01-31 CN CN201280016250.3A patent/CN103477483B/zh not_active Expired - Fee Related
- 2012-01-31 WO PCT/JP2012/052177 patent/WO2012105575A1/ja active Application Filing
- 2012-01-31 US US13/983,014 patent/US20130316267A1/en not_active Abandoned
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH1066916A (ja) * | 1996-07-30 | 1998-03-10 | Eastman Kodak Co | 多層塗布装置および方法 |
JP2002134131A (ja) * | 2000-10-23 | 2002-05-10 | Toho Gas Co Ltd | 支持膜式固体電解質型燃料電池 |
JP2005322547A (ja) * | 2004-05-11 | 2005-11-17 | Toho Gas Co Ltd | 低温作動型固体酸化物形燃料電池単セル |
JP2010027359A (ja) * | 2008-07-18 | 2010-02-04 | Nippon Shokubai Co Ltd | リサイクルジルコニア粉末の製造方法、当該製造方法によるリサイクルジルコニア粉末、およびそれを用いたジルコニア焼結体の製造方法 |
JP2008305804A (ja) | 2008-07-28 | 2008-12-18 | Toho Gas Co Ltd | 高イオン導電性固体電解質材料及びその製造方法、焼結体、固体電解質型燃料電池 |
Non-Patent Citations (1)
Title |
---|
See also references of EP2672556A4 * |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2016115600A (ja) * | 2014-12-17 | 2016-06-23 | 株式会社日本触媒 | メタルサポートセル |
WO2022208705A1 (ja) * | 2021-03-31 | 2022-10-06 | 株式会社日立ハイテク | 燃料電池セルおよびその製造方法 |
TWI811984B (zh) * | 2021-03-31 | 2023-08-11 | 日商日立全球先端科技股份有限公司 | 燃料電池胞及其製造方法 |
Also Published As
Publication number | Publication date |
---|---|
US20130316267A1 (en) | 2013-11-28 |
EP2672556A1 (en) | 2013-12-11 |
JPWO2012105575A1 (ja) | 2014-07-03 |
EP2672556B1 (en) | 2017-05-10 |
CN103477483B (zh) | 2016-09-28 |
CN103477483A (zh) | 2013-12-25 |
JP5652752B2 (ja) | 2015-01-14 |
EP2672556A4 (en) | 2015-07-08 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
JP5725449B2 (ja) | 固体酸化物形燃料電池 | |
TWI501937B (zh) | 低降能之相穩定性經摻雜氧化鋯電解質組合物 | |
AU2011209829B2 (en) | Phase stable doped zirconia electrolyte compositions with low degradation | |
JP5729572B2 (ja) | 固体電解質材料およびこれを備えた固体酸化物形燃料電池 | |
JP5615771B2 (ja) | 固体酸化物形燃料電池システム及び導電性接合材 | |
JP2000340240A (ja) | 高イオン導電性固体電解質材料及びそれを用いた固体電解質型燃料電池 | |
TW201624812A (zh) | 具有對固態氧化物燃料電池之退化有改善抗性之固態氧化物燃料電池陰極組合物 | |
JP5652752B2 (ja) | 固体電解質材料およびこれを備えた固体酸化物形燃料電池 | |
JP2012134122A (ja) | 固体酸化物型燃料電池 | |
JP5546559B2 (ja) | 固体酸化物形燃料電池および該燃料電池のカソード形成用材料 | |
JP5219370B2 (ja) | イオン伝導体 | |
JP5652753B2 (ja) | 固体酸化物形燃料電池 | |
JP4496749B2 (ja) | 固体酸化物型燃料電池 | |
JP2012099322A (ja) | 固体酸化物型燃料電池 | |
JP2002316872A (ja) | ランタンガレート系固体電解質材料、その製造方法および固体電解質型燃料電池 | |
JP2012074304A (ja) | 固体酸化物形燃料電池用発電セル |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
121 | Ep: the epo has been informed by wipo that ep was designated in this application |
Ref document number: 12742321 Country of ref document: EP Kind code of ref document: A1 |
|
ENP | Entry into the national phase |
Ref document number: 2012555911 Country of ref document: JP Kind code of ref document: A |
|
NENP | Non-entry into the national phase |
Ref country code: DE |
|
WWE | Wipo information: entry into national phase |
Ref document number: 13983014 Country of ref document: US |
|
REEP | Request for entry into the european phase |
Ref document number: 2012742321 Country of ref document: EP |
|
WWE | Wipo information: entry into national phase |
Ref document number: 2012742321 Country of ref document: EP |