WO2014148110A1 - 固体酸化物型燃料電池 - Google Patents
固体酸化物型燃料電池 Download PDFInfo
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- WO2014148110A1 WO2014148110A1 PCT/JP2014/051820 JP2014051820W WO2014148110A1 WO 2014148110 A1 WO2014148110 A1 WO 2014148110A1 JP 2014051820 W JP2014051820 W JP 2014051820W WO 2014148110 A1 WO2014148110 A1 WO 2014148110A1
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- air electrode
- layer
- fuel cell
- oxide fuel
- slits
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Definitions
- the present invention relates to a solid oxide fuel cell including an air electrode.
- a solid oxide fuel cell generally includes a porous fuel electrode, a dense solid electrolyte layer, and a porous air electrode (see Patent Document 1).
- the air electrode is formed by separately firing a molded body disposed on the fired solid electrolyte layer.
- the present invention has been made in view of the above-described situation, and an object thereof is to provide a solid oxide fuel cell capable of suppressing separation of an air electrode.
- a solid oxide fuel cell includes a fuel electrode, an air electrode represented by the general formula ABO 3 , and containing a perovskite complex oxide containing at least one of La and Sr at the A site as a main component, A solid electrolyte layer disposed between the fuel electrode and the air electrode.
- the air electrode active layer includes a plurality of slits in a surface region within a predetermined distance from the surface on the solid electrolyte layer side.
- FIG. 1 is an enlarged cross-sectional view showing a configuration of a solid oxide fuel cell 10.
- FIG. 2 is an enlarged cross-sectional view of the air electrode 50.
- the solid oxide fuel cell 10 is a fuel cell of a vertical stripe type, a horizontal stripe type, a fuel electrode support type, an electrolyte flat plate type, or a cylindrical type. As shown in FIG. 1, the solid oxide fuel cell 10 includes a fuel electrode 20, a solid electrolyte layer 30, a barrier layer 40, and an air electrode 50.
- the fuel electrode 20 functions as an anode of the solid oxide fuel cell 10. As illustrated in FIG. 1, the fuel electrode 20 includes a fuel electrode current collecting layer 21 and a fuel electrode active layer 22.
- the anode current collecting layer 21 is a porous plate-like fired body.
- materials conventionally used for the anode current collecting layer of SOFC can be used, and examples thereof include NiO / Ni-8YSZ and NiO / Ni—Y 2 O 3.
- the thickness of the anode current collecting layer 21 can be 0.2 mm to 5.0 mm.
- the anode active layer 22 is disposed on the anode current collecting layer 21.
- the anode active layer 22 is a porous plate-like fired body.
- materials conventionally used for SOFC anode current collecting layers can be used, and examples thereof include NiO / Ni-8YSZ.
- the thickness of the anode active layer 22 can be 5 ⁇ m to 30 ⁇ m.
- the solid electrolyte layer 30 is disposed between the fuel electrode 20 and the barrier layer 40.
- the solid electrolyte layer 30 has a function of transmitting oxygen ions generated at the air electrode 50.
- Examples of the material of the solid electrolyte layer 30 include yttria-stabilized zirconia such as 3YSZ, 8YSZ, and 10YSZ, and zirconia-based materials such as ScSZ.
- the thickness of the solid electrolyte layer 30 can be 3 ⁇ m to 30 ⁇ m.
- the solid electrolyte layer 30 is dense, and the porosity of the solid electrolyte layer 30 is preferably 10% or less.
- the barrier layer 40 is disposed between the solid electrolyte layer 30 and the air electrode 50.
- the barrier layer 40 has a function of suppressing the formation of a high resistance layer between the solid electrolyte layer 30 and the air electrode 50.
- Examples of the material of the barrier layer 40 include ceria (CeO 2 ) and a ceria-based material containing a rare earth metal oxide dissolved in CeO 2 . Examples of such ceria materials include GDC and SDC.
- the thickness of the barrier layer 40 can be 3 ⁇ m to 20 ⁇ m.
- the barrier layer 40 is dense, and the porosity of the barrier layer 40 is preferably 15% or less.
- the barrier layer 40 forms an interface P1 with the air electrode 50 (specifically, the air electrode active layer 52).
- the air electrode 50 is disposed on the barrier layer 40.
- the air electrode 50 functions as a cathode of the solid oxide fuel cell 10.
- the air electrode 50 is porous, and the porosity of the air electrode 50 can be 25% to 50%.
- the air electrode 50 according to the present embodiment includes an air electrode current collecting layer 51 and an air electrode active layer 52.
- the air electrode current collecting layer 51 is a porous plate-like fired body.
- the thickness of the air electrode current collecting layer 51 can be 30 ⁇ m to 500 ⁇ m.
- the air electrode current collecting layer 51 is a part that supplies electrons necessary for the power generation reaction of the solid oxide fuel cell 10 to the air electrode active layer 52.
- the air electrode current collecting layer 51 preferably has higher electron conductivity than the air electrode active layer 52.
- the air electrode current collecting layer 51 may have oxygen ion conductivity or may not have oxygen ion conductivity. Examples of such a material for the air electrode current collecting layer 51 include a material which is represented by the general formula ABO 3 and contains a perovskite complex oxide containing at least one of La and Sr at the A site as a main component.
- Examples of the material containing a perovskite complex oxide which is represented by the general formula ABO 3 and contains at least one of La and Sr at the A site, include (La, Sr) CoO 3 and La (Ni, Fe, Cu) O 3 and the like, and perovskite complex oxides represented by the following formula (1) are particularly preferable.
- x is 0.03 or more and 0.3 or less
- y is 0.05 or more and 0.5 or less
- ⁇ is 0 or more and 0.8 or less.
- the composition of Ni 1-xy Fe x Cu y at the B site is not affected by the x and y values.
- the thermal expansion coefficient of the material that the air electrode current collecting layer 51 contains as a main component may be smaller than the thermal expansion coefficient of the material that the air electrode active layer 52 described later contains as a main component.
- the thermal expansion coefficient of the perovskite complex oxide represented by the formula (1) is about 13 to 14 ppm / K.
- the composition X “contains the substance Y as a main component” means that the substance Y preferably accounts for 60% by weight or more, more preferably 70% by weight or more in the entire composition X. Means more preferably 90% by weight or more.
- the air electrode active layer 52 is a porous plate-like fired body.
- the air electrode active layer 52 is disposed on the solid electrolyte layer 30 side of the air electrode current collecting layer 51.
- the air electrode active layer 52 is co-sintered with the air electrode current collecting layer 51.
- the air electrode active layer 52 forms an interface P ⁇ b> 2 with the air electrode current collecting layer 51.
- the thickness of the air electrode active layer 52 can be 5 ⁇ m to 50 ⁇ m.
- the air electrode active layer 52 is a part responsible for a power generation reaction in the solid oxide fuel cell 10.
- the air electrode active layer 52 has oxygen ion conductivity and electron conductivity.
- the air electrode active layer 52 can be made of a composite material obtained by mixing an oxygen ion conductive material and an electron conductive material, or an oxygen ion-electron mixed conductive material. Examples of the mixed conductive material include perovskite complex oxides represented by the general formula ABO 3 and containing at least one of La and Sr at the A site.
- Examples of such a perovskite complex oxide include materials such as LSF, that is, (La, Sr) FeO 3 , LSC, that is, (La, Sr) CoO 3 , and in particular, LSCF, that is, (La, Sr) (Co, Fe). O 3 is preferred.
- the air electrode active layer 52 may contain a zirconia-based material including yttria-stabilized zirconia such as 3YSZ, 8YSZ, and 10YSZ and scandia-stabilized zirconia such as ScSZ.
- the thermal expansion coefficient of the material that the air electrode active layer 52 contains as a main component may be larger than the thermal expansion coefficient of the material that the air electrode current collecting layer 51 contains as a main component.
- the thermal expansion coefficient of LSCF is about 14-16 ppm / k.
- the air electrode active layer 52 includes a region 52a (hereinafter referred to as “surface region”) within a predetermined distance Da from the interface P1 with the barrier layer 40. That is, the surface region 52 a is a region within a predetermined distance Da from the surface on the solid electrolyte layer 30 side of the air electrode active layer 52, and is connected to the barrier layer 40.
- the predetermined distance Da can be set to 0.5 ⁇ m to 3 ⁇ m.
- the air electrode active layer 52 includes a plurality of slits SL in the surface region 52a.
- FIG. 3 is an SEM image in which the cross section of the surface region 52a is enlarged 30,000 times.
- FIG. 4 is an SEM image in which the cross section of the surface region 52a is magnified 100,000 times.
- the slit SL shown in the SEM image of FIG. 3 is displayed at the center of the image.
- the plurality of slits SL are formed inside the surface region 52a. Some of the slits SL may be exposed on the surface of the surface region 52a (that is, the side surface of the solid oxide fuel cell 10).
- the slit SL may be formed along the grain boundary between the particles constituting the air electrode active layer 52 or may be formed so as to break the particles constituting the air electrode active layer 52. Furthermore, the slit SL may be formed such that a portion along the grain boundary and a portion that breaks the inside of the particle are continuous. In the SEM images of FIGS. 3 and 4, the slit SL formed along the grain boundary is shown.
- the number of the plurality of slits SL is such that when any 10 visual fields in the cross section of the surface region 52a are observed with an SEM (Scanning Electron Microscope) with a magnification of 30,000, at least one of the 20 visual fields is observed. It is preferable that the slit SL is found, and it is preferable that at least one slit is found in each of the two views of the 20 views.
- Each of the plurality of slits SL formed at such a frequency narrows or widens, so that distortion of the air electrode 50 at the time of temperature drop after firing is suppressed. Note that the SEM image in FIG. 3 shows that one slit SL is observed in one field of view, but as described above, there are a plurality of slits SL in the surface region 52a. .
- the average length of the plurality of slits SL is more preferably 100 nm or more and 1000 nm or less. In the present embodiment, the average length is an average value of linear distances connecting both ends of the slit SL in the SEM image.
- the average width of the plurality of slits SL is more preferably 1 nm or more and 100 nm or less. In the present embodiment, the average width is an average value of the maximum width of the slit SL in the SEM image.
- the average slit length and average width are preferably calculated based on measured values of at least 10 slits SL.
- a molded body of the anode current collecting layer 21 is formed by molding an anode current collecting layer powder by a die press molding method.
- PVA polyvinyl butyral
- a pore-forming agent for example, PMMA (polymethyl methacrylate)
- the molded body of the anode active layer 22 is formed by printing the slurry on the molded body of the anode current collecting layer 21 using a printing method or the like.
- a molded body of the fuel electrode 20 is formed.
- a slurry is prepared by mixing water and a binder with the solid electrolyte layer powder. Then, the molded body of the solid electrolyte layer 30 is formed by applying the slurry onto the molded body of the fuel electrode 20 using a coating method or the like.
- slurry is prepared by mixing water and a binder with the barrier layer powder.
- the molded object of the barrier layer 40 is formed by apply
- the co-fired body of the fuel electrode 20, the dense solid electrolyte layer 30, and the dense barrier layer 40 is formed by co-sintering the laminate of the molded bodies produced as described above at 1300 to 1600 ° C. for 2 to 20 hours. To do.
- water and a binder are mixed with air electrode active layer material powder (for example, LSCF, LSF, LSC, LSM-8YSZ, etc.) to prepare a slurry.
- air electrode active layer material powder for example, LSCF, LSF, LSC, LSM-8YSZ, etc.
- region 52a among the air electrode active layers 52 is formed by apply
- a slurry is prepared by mixing water and a binder with the air electrode active layer material powder. Then, a molded body in a region other than the surface region 52a (hereinafter, referred to as “collecting layer side region”) is formed by applying the slurry onto the molded body in the surface region 52a using a coating method or the like.
- the material powder constituting the surface region 52a may have different physical properties (average particle size, maximum particle size, particle size distribution, particle shape, etc.) from the material powder constituting the current collecting layer side region.
- the number of slits SL in the surface region 52a can be controlled. Specifically, the number of slits SL can be increased as the average particle size and the maximum particle size are increased or the particle size distribution is increased.
- the co-fired body and the molded body of the air electrode 50 are sintered at 900 to 1100 ° C. for 1 to 20 hours.
- the length and width of the slit SL in the surface region 52a can be controlled by adjusting the firing conditions (such as the firing temperature, the temperature raising rate, and the temperature lowering rate). Specifically, the slit SL can be made wider and longer as the firing temperature is increased, or as the temperature increase rate or temperature decrease rate is increased.
- the solid oxide fuel cell 10 includes the solid electrolyte layer 30, the barrier layer 40, and the air electrode 50.
- the present invention is not limited to this.
- the solid oxide fuel cell 10 may not include the barrier layer 40.
- the air electrode 50 is formed on the solid electrolyte layer 30 through a firing step different from that of the solid electrolyte layer 30.
- the solid oxide fuel cell 10 may include a porous barrier layer instead of the dense barrier layer 40.
- the porous barrier layer is formed on the solid electrolyte layer 30 through a firing step different from that of the solid electrolyte layer 30.
- the air electrode is formed on the porous barrier layer through a firing step different from that of the porous barrier layer.
- the porous barrier layer can be made of, for example, a ceria material.
- the solid oxide fuel cell 10 may include a porous barrier layer interposed between the barrier layer 40 and the air electrode 50.
- the porous barrier layer is formed on the barrier layer 40 through a baking step different from that of the barrier layer 40.
- the air electrode is formed on the porous barrier layer through a firing step different from that of the porous barrier layer.
- the present invention suppresses separation of the air electrode 50 formed on the fired body (solid electrolyte layer or barrier layer). Therefore, the air electrode 50 only needs to be formed through a firing process different from that of the fired body. Whether the air electrode 50 is formed on the dense layer or the porous layer depends on whether the air electrode 50 is formed on the porous layer. It does not affect the mechanism by which the separation of the pole 50 is suppressed.
- the SEM is used for the observation of the slit SL.
- the present invention is not limited to this.
- an electron microscope such as TEM (Transmission Electron Microscope) can be used.
- the air electrode active layer 52 may have a slit SL in the current collecting layer side region other than the surface region 52a.
- the air electrode 50 includes the air electrode current collecting layer 51 and the air electrode active layer 52 including the surface region 52a. However, the air electrode 50 includes the air electrode current collecting layer 51. It does not have to be.
- the air electrode 50 has only one surface region 52a.
- the air electrode 50 may have a plurality of surface regions 52a.
- the whole air electrode active layer 52 may be the surface region 52a. Further, the entire air electrode active layer 52 and a part or all of the air electrode current collecting layer 51 may be the surface region 52a. That is, the surface region 52a only needs to be provided on the solid electrolyte layer 30 side in the air electrode 50.
- a co-fired body of a fuel electrode, a solid electrolyte layer, and a barrier layer was prepared.
- a slurry of the active layer material shown in Table 1 was applied onto the barrier layer to form a molded body of the air electrode active layer.
- the average particle size of the powder used in this slurry was 0.2 to 0.5 ⁇ m, and the maximum particle size was 1.0 to 1.5 ⁇ m. Further, the thickness of the air electrode active layer was adjusted as described in Table 1 by changing the number of times of applying the slurry.
- an air electrode was prepared by firing a laminate of molded bodies of the air electrode active layer and the air electrode current collecting layer at 950 to 1000 ° C. for 1 to 20 hours. At this time, the temperature rising rate was 100 ° C./hr, and the temperature lowering rate was 100 ° C./hr.
- a co-fired body of a fuel electrode, a solid electrolyte layer, and a barrier layer was prepared.
- a slurry of the active layer material shown in Table 1 was applied on the barrier layer to form a surface area molded body of the air electrode active layer.
- the frequency (number) of slits was adjusted as described in Table 1 by adjusting the average particle size, maximum particle size, and particle size distribution of the powder used in the slurry. Specifically, sample no. The average particle size and the maximum particle size of 2, 5, 10, 13, 17, and 22 were 0.2 to 0.5 ⁇ m and 1.0 to 1.5 ⁇ m. The thickness was set to 0.5 to 1.4 ⁇ m and 2.0 to 2.8 ⁇ m. In addition, the thickness of the surface region was adjusted as described in Table 1 by changing the number of times the slurry was applied.
- the air electrode current collecting layer formed body was formed by applying the slurry of the current collecting layer material shown in Table 1 onto the formed body in the current collecting layer side region.
- an air electrode was produced by firing a laminate of molded bodies of the air electrode active layer and the air electrode current collecting layer at 950 to 1100 ° C. for 1 to 20 hours.
- the width and length of the slits formed in the surface region were adjusted as described in Table 1.
- sample no. Nos. 2, 5, 10, 13, 17, and 22 were set to 950 to 1000 ° C., 100 to 150 ° C./hr, and 100 to 150 ° C./hr, respectively.
- the firing temperature, heating rate and cooling rate of 3,4,6-8,12,14,16,18-20,24,25 are 1000-1100 ° C, 200-400 ° C / hr, 200-250 ° C / hr. It was.
- Sample No. The firing temperature, temperature increase rate, and temperature decrease rate of 9,21 were 1050 to 1100 ° C., 300 to 400 ° C./hr, and 230 to 250 ° C./hr.
- the width and length of all the found slits were measured, and the average width and average length of the slits were calculated.
- the number (frequency), average width, and average length of the found slits are as shown in Table 1.
- the average width is an average value of the maximum widths of the slits
- the average length is an average value of linear distances at both ends of the slits.
- 2 to 10, 12 to 14, 16 to 22, 24, and 25 it was possible to suppress the occurrence of peeling that might affect the air electrode characteristics at the interface between the barrier layer and the air electrode. This is because the distortion of the air electrode after firing can be alleviated by a plurality of fine slits formed in the surface region.
- the solid oxide fuel cell according to the present invention is useful in the fuel cell field because it can suppress the separation of the air electrode.
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Abstract
Description
固体酸化物型燃料電池(Solid Oxide Fuel Cell:SOFC)10の構成について、図面を参照しながら説明する。図1は、固体酸化物型燃料電池10の構成を示す拡大断面図である。図2は、空気極50の拡大断面図である。
なお、式(1)において、xは0.03以上0.3以下であり、yは0.05以上0.5以下であり、δは0以上0.8以下である。ただし、BサイトにおけるNi1-x-yFexCuyの組成は、x値及びy値の影響を受けることはないものとする。
次に、固体酸化物型燃料電池10の製造方法の一例について説明する。ただし、以下に述べる材料、粒径、温度、及び塗布方法等の各種条件は、適宜変更することができる。
本発明は以上のような実施形態に限定されるものではなく、本発明の範囲を逸脱しない範囲で種々の変形又は変更が可能である。
本発明は、焼成体(固体電解質層又はバリア層)上に形成される空気極50の剥離を抑制するものである。そのため、空気極50は焼成体とは別の焼成工程を経て形成されていればよく、空気極50が緻密質層上に形成されているか、或いは多孔質層上に形成されているかは、空気極50の剥離が抑制される機序に影響を与えるものではない。
以下のようにして、サンプルNo.1,11,15,23を作製した。
以下のようにして、サンプルNo.2~10,12~14,16~22,24,25を作製した。
サンプルNo.1~No.25の断面を3万倍率のSEMで観察することによって、空気極活性層の表面領域における細隙の有無を観察した。各サンプルにつき任意の20視野を観察した。
焼成後のサンプルNo.1~No.25の断面を顕微鏡で観察することによって、バリア層と空気極の界面における剥離の有無を確認した。確認結果を表1にまとめて示す。
表1では、空気極特性に影響を与えうる5μm以上の剥離が確認されたサンプルを“×”と評価し、5μm以下の剥離だけが確認されたサンプルを“○”と評価し、剥離が確認されなかったサンプルを“◎”と評価した。
焼成後に剥離が確認されなかったサンプルについて、還元雰囲気を維持した状態で、常温から800℃まで30分で昇温し、その後1時間で常温まで降させるサイクルを10回繰り返した。
20 燃料極
21 燃料極集電層
22 燃料極活性層
30 固体電解質層
40 バリア層
50 空気極
51 空気極集電層
52 空気極活性層
52a 表面領域
Claims (6)
- 燃料極と、
一般式ABO3で表され、AサイトにLa及びSrの少なくとも一方を含むペロブスカイト型複合酸化物を主成分として含有する空気極と、
前記燃料極と前記空気極の間に配置される固体電解質層と、
を備え、
前記空気極は、前記固体電解質層側の表面から所定距離以内の表面領域において複数の細隙を含む、
固体酸化物型燃料電池。 - 前記表面領域の断面における任意の20視野を3万倍率の電子顕微鏡で観察した場合、前記20視野のうち少なくとも1視野において、前記複数の細隙の中の少なくとも1つの細隙が観察される、
請求項1に記載の固体酸化物型燃料電池。 - 前記表面領域の断面における任意の20視野を3万倍率の電子顕微鏡で観察した場合、前記20視野のうち少なくとも2視野それぞれにおいて、前記複数の細隙の中の少なくとも1つの細隙が観察される、
請求項2に記載の固体酸化物型燃料電池。 - 前記複数の細隙の平均幅は、1nm以上、100nm以下である、
請求項1乃至3のいずれかに記載の固体酸化物型燃料電池。 - 前記複数の細隙の平均長さは、100nm以上、1000nm以下である、
請求項1乃至4のいずれかに記載の固体酸化物型燃料電池。 - 前記空気極は、空気極集電層と、前記空気極集電層と固体電解質層の間に配置される空気極活性層とを有し、
前記空気極集電層は、La(Ni,Fe,Cu)O3系材料を主成分として含有し、
前記空気極活性層は、(La,Sr)(Co,Fe)O3系材料を主成分として含有する、
請求項1乃至5のいずれかに記載の固体酸化物型燃料電池。表面領域
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