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Solid oxide fuel cell, manufacturing method therefor, fuel-cell stack, and solid oxide fuel-cell device

A fuel cell unit, solid oxide technology, applied in fuel cells, battery electrodes, electrical components, etc., can solve the problems of low initial power generation performance of solid oxide fuel cell units and high resistance value of the anti-diffusion layer

Active Publication Date: 2016-03-02
MORIMURA SOFC TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] However, according to the research of the inventors of the present invention, it has been found that the solid oxide fuel cell having the element diffusion preventing layer disclosed in Patent Document 1 can suppress the diffusion of Sr even after long-term operation, but the element diffusion preventing layer Composed of interdiffusion layers of GDC and YSZ, therefore, the resistance value of the element diffusion prevention layer is high, and the initial power generation performance of the solid oxide fuel cell unit is low

Method used

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  • Solid oxide fuel cell, manufacturing method therefor, fuel-cell stack, and solid oxide fuel-cell device

Examples

Experimental program
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Effect test

example 1

[0116] (1) Preparation of green sheet for solid electrolyte layer

[0117] For the specific surface area measured by BET method is 5 ~ 7m 2 / g of YSZ powder, add butyral resin, dioctyl phthalate (DOP) as a plasticizer, a dispersant, and a mixed solvent of toluene and ethanol, and mix with a ball mill to prepare a slurry. From the obtained slurry, a green sheet for a solid electrolyte layer having a thickness of 10 μm was obtained by using a doctor blade method.

[0118] (2) Preparation of green sheet for fuel electrode layer

[0119] For the specific surface area measured by BET method is 3 ~ 4m 2 / g of NiO powder is weighed so that the weight converted to Ni is 55 parts by mass, and the specific surface area measured by the BET method is 5 to 7 m 2 45 parts by mass of powder of YSZ / g were mixed to obtain a mixed powder. To this mixed powder, a butyral resin, DOP as a plasticizer, a dispersant, and a mixed solvent of toluene and ethanol were added, and mixed with a ball mi...

example 2

[0137] In the process of (4) preparation, printing and firing of the slurry for forming the intermediate layer, the firing is carried out at 1200° C., so that the thickness of the intermediate layer is 3 μm, and the thickness of the initial anti-diffusion layer is 300 nm. In addition Other than that, the experiment was carried out in the same manner as in Example 1, and the thickness of the element diffusion prevention layer, the average particle diameter of the element diffusion prevention layer, and the Sr coverage were measured, and the deterioration rate was calculated. The results are shown in Table 1 and Table 2 below.

example 3

[0139] In the process of (4) preparation, printing and firing of the slurry for forming the intermediate layer, the firing is carried out at 1250° C., so that the thickness of the intermediate layer is 3 μm, and the thickness of the initial anti-diffusion layer is 400 nm. In addition Other than that, the experiment was carried out in the same manner as in Example 1, and the thickness of the element diffusion prevention layer, the average particle diameter of the element diffusion prevention layer, and the Sr coverage were measured, and the deterioration rate was calculated. The results are shown in Table 1 and Table 2 below.

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Abstract

The provision of a solid oxide fuel cell that does not decrease in electrical generation performance even after being run for a long period of time, a manufacturing method therefor, a fuel-cell stack, and a solid oxide fuel-cell device. This solid oxide fuel cell, which has a solid electrolyte layer, an air-electrode layer that contains at least strontium and is formed on one surface of the solid electrolyte layer, and a fuel-electrode layer formed on the other surface of the solid electrolyte layer, with an intermediate layer formed between the solid electrolyte layer and the air-electrode layer, is characterized in that at least part of the intermediate layer contains an element-diffusion prevention layer, said element-diffusion prevention layer comprises a complex oxide containing zirconium and at least one rare-earth element, and after the solid oxide fuel cell is heat-treated in atmosphere for 100 hours at 1,000 DEG C, the element-diffusion prevention layer is between 600 and 2,000nm thick, inclusive, and exhibits a strontium coverage of 90% or less.

Description

technical field [0001] The present invention relates to a solid oxide fuel cell, a method for producing the same, a fuel cell stack, and a solid oxide fuel cell, and more specifically, to a solid oxide fuel cell with high initial power generation performance, suppressed deterioration, and power generation performance even after long-term operation. A solid oxide fuel cell that is not easy to reduce, a method for manufacturing the same, a fuel cell stack, and a solid oxide fuel cell. Background technique [0002] Conventionally, as a fuel cell, a solid oxide fuel cell using a solid oxide as an example of a solid electrolyte is known. In a solid oxide fuel cell, for example, a solid oxide fuel cell stack is formed by stacking many solid oxide fuel cells having a fuel electrode layer and an air electrode layer on each side of a plate-shaped solid electrolyte layer. During operation of the solid oxide fuel cell, a fuel gas such as hydrogen gas is supplied to the fuel electrode ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M8/1213H01M8/0236H01M8/0245
CPCH01M8/1213H01M4/8657H01M4/9025H01M4/9033H01M8/1246H01M2008/1293H01M8/2432H01M8/2404Y02P70/50Y02E60/50H01M8/2465H01M8/2425H01M2300/0071
Inventor 松野敏博村濑智聪久野优子山际胜也
Owner MORIMURA SOFC TECH CO LTD
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