Solid electrolyte fuel cell

Description: TECHNICAL FIELD [Detailed description of the invention]

【0001】

[Industrial application field]

The present invention relates to a solid electrolyte fuel cell, and more particularly to a cylindrical horizontal stripe solid electrolyte fuel cell applied to a high temperature steam electrolysis cell.

【0002】

[Conventional technology]

FIG. 1 shows a cylindrical horizontal stripe type solid electrolyte fuel cell (hereinafter referred to as a cylindrical horizontal stripe type SOFC). Further, FIG. 2 is a partially enlarged view of the main part of FIG. Reference numeral 1 in the figure is a substrate tube made of, for example, calcia-stabilized zirconia (CSZ). A fuel electrode 2, a solid electrolyte 3, an interconnector 4, an air electrode 5, and a protective film 6 are formed on the substrate tube 1 by a thermal spraying method. Here, the fuel electrode is, for example, NiO / yttria-stabilized zirconia (YSZ), the solid-state electromodified 3 is, for example, YSZ, and the interconnector is NiCr / Al.₂ O₃ , The air pole is, for example, LaCoO₃ It consists of each.

【0003】

[Problems to be Solved by the Invention]

As described above, in the conventional cylindrical horizontal stripe type SOFC, all the constituent materials, that is, the fuel electrode 2, the solid electrolyte 3, the interconnector 4, the air electrode 5, and the protective film 6 are manufactured by the thermal spraying method.

【0004】

However, in the thermal spraying method, the yield of the raw material powder is low and the number of masking times is large, so that the process is complicated and mass production is difficult. Further, at the fuel electrode 2 and the solid electrolyte 3 end shown in the X portion of FIG. 2, there is a portion where the film thickness of the solid electrolyte 3 may become thin, and there is a risk of peeling during the power generation test.

【0005】

The present invention has been made in consideration of such circumstances. By forming a groove for the fuel electrode on the surface of the base tube and embedding the fuel electrode in this groove by letterpress printing, the electrolyte at the end of the fuel electrode and the solid electrolyte It is an object of the present invention to provide a solid electrolyte fuel cell which can reduce the risk of film breakage and can be expected to improve the material yield.

【0006】

[Means for solving problems]

In the present invention, a substrate tube having a groove for a fuel electrode formed on its surface, a fuel electrode embedded in the groove by letterpress printing, and a solid electrolyte and an air electrode formed on the substrate tube including the fuel electrode. It is a solid electrolyte type fuel cell characterized by having. In the present invention, examples of the material of the substrate tube include calcia-stabilized zirconia. The fuel electrode material is, for example, NiO / yttria-stabilized zirconia (YSZ), the solid electrolyte material is, for example, YSZ, and the interconnector material is, for example, (NiCr / Al).₂ O₃ + NiAl / Al₂ O₃ ). In the present invention, the solid electrolyte and the air electrode can be formed by, for example, intaglio printing.

【0007】

[Action]

According to the present invention (1) A recess for a fuel electrode is provided on the substrate tube, and a fuel electrode is formed in this recess by letterpress printing. This makes it possible to reduce the risk of damage to the solid electrolyte at the fuel electrode / solid electrolyte end.

【0008】

(2) By using intaglio printing for the film formation of solid electrolyte and air electrode, it is expected that the material yield will be improved compared to the thermal spraying method. (3) By using an alloy such as NiCr for the interconnector, it is possible to produce SOFCs with higher performance than SOFCs produced by sintering all the constituent materials.

【0009】

[Example]

Hereinafter, an embodiment of the present invention will be described with reference to FIGS. 3 and 4. Here, FIG. 3 is an explanatory view of a base tube which is one configuration of the cylindrical striped solid electrolyte fuel cell (SOFC) of the present invention, and FIG. 4 is a cross-sectional view of the SOFC.

【0010】

Reference numeral 11 in the figure is a substrate tube made of calcia-stabilized zirconia (CSZ). A recess (groove) 12 for a fuel electrode is formed on the surface of the substrate tube 11. A fuel electrode 13 made of NiO / yttria-stabilized zirconia (YSZ) is formed in the recess 12 by letterpress printing. On the substrate tube 11 including the fuel electrode 13, the solid electrolyte 14, La made of YSZ_0.9 Sr_0.1 MnO₃ Air pole consisting of 15, (NiCr / Al₂ O₃ + NiAl / Al₂ O₃ ) Interconnector 16 and Al₂ O₃ A protective film 17 made of the above is formed.

【0011】

SOFCs with such a configuration are prepared as follows. First, CSZ, which is a substrate tube material, is made into a shape with recesses (grooves) 12 for fuel electrodes by the Cold Isostatic Press (hereinafter referred to as CIP) method, and then calcined at 1300 ° C. To make the substrate tube 11. Next, the NiO / YSZ slurry, which is the fuel electrode material, is formed into the recess 12 of the substrate tube 11 by letterpress printing to form the fuel electrode 13. Next, YSZ slurry, which is a solid electrolyte, and La, which is an air electrode material._0.9 Sr_0.1 MnO₃ The slurry is formed by concave printing and fired at 1300 ° C to form the solid electrolyte 14 and the air electrode 15. In addition, (NiCr / Al₂ O₃ + NiAl / Al₂ O₃ ) Interconnector 16 and Al₂ O₃ A protective film 17 made of the above is formed to form SOFC.

【0012】

Therefore, according to the above embodiment, it has the following effects. (1) A recess 12 for a fuel electrode is provided on the substrate tube 11, and a fuel electrode 13 is formed in the recess 12 by letterpress printing. This makes it possible to reduce the risk of damage to the solid electrolyte 14 at the end of the fuel electrode 13 / solid electrolyte 14.

【0013】

(2) By using intaglio printing for the film formation of the solid electrolyte 14 and the air electrode 15, the material yield can be expected to be improved as compared with the thermal spraying method. (3) By using an alloy such as NiCr for the interconnector, it is possible to produce SOFCs with higher performance than SOFCs produced by sintering all the constituent materials.

【0014】

In the above embodiment, the material of the substrate tube is calcia-stabilized zirconia, the material of the fuel electrode is NiO / YSZ, the material of the solid electrolyte is YSZ, and the material of the interconnector is (NiCr / Al).₂ O₃ + NiAl / Al₂ O₃ ) Has been described, but the present invention is not limited to this, and other materials may be used.

【0015】

[Effect of the invention]

As described in detail above, according to the present invention, a groove for the fuel electrode is formed on the surface of the substrate tube, and the fuel electrode is embedded in the groove by letterpress printing, whereby the electrolyte film at the end of the fuel electrode and the solid electrolyte is formed. The risk of breakage can be reduced, and the material yield can be expected to improve by using concave printing for the formation of solid electrolyte and air electrode. Furthermore, by using an alloy such as NiCr for the interconnector, It is possible to provide a solid electrolyte fuel cell that can realize high performance and can be applied to a high temperature steam electric field cell or the like.

[Simple explanation of drawings]

[Figure 1]

Sectional view of the conventional cylindrical horizontal stripe type SOFC.

[Figure 2]

Sectional drawing of the main part of the cylindrical horizontal stripe type SOFC of FIG.

[Fig. 3]

The explanatory view of the base tube which is one structure of the cylindrical horizontal stripe type SOFC which concerns on one Example of this invention.

[Fig. 4]

Explanatory drawing of the cylindrical horizontal stripe type SOFC which concerns on one Example of this invention.

[Explanation of symbols]

11 ... Base tube, 12 ... Groove (concave), 13 ... Fuel electrode, 14 ... Solid electrolyte, 15 ... Air electrode, 16 ... Interconnector, 17 ... Protective membrane ..