Electrolyte electrode assembly and method of producing the same
AssigneeHonda Motor Co., Ltd.
InventorTakayuki Yamada
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Abstract
A unit cell of a fuel cell is formed by sandwiching an electrolyte electrode assembly between a pair of separators. The separators include bosses protruding toward an anode or a cathode. On one surface of the electrolyte electrode assembly facing the separator, the cathode is provided. Then, an electron diffusion layer is provided on the cathode. Electrons which reach the electron diffusion layer through the bosses are diffused over the entire area of the electron diffusion layers. By the electrons, reduction of oxygen in the oxygen-containing gas which has passed through a second passage between the bosses occurs. As a result, oxide ions (O2−) are generated.
Claims14
An electrolyte electrode assembly sandwiched between a pair of separators, said electrolyte electrode assembly comprising an anode, a cathode, and an electrolyte interposed between said anode and said cathode, wherein
- a layers is provided between said cathode and said one of said separators, said layer comprising material which has electron conductivity higher than that of said cathode, and which is capable of inducing oxygen reduction.
A method of producing an electrolyte electrode assembly sandwiched between a pair of separators, said electrolyte electrode assembly including an anode, a cathode, and an electrolyte interposed between said anode and said cathode, said method comprising the steps of:
- providing said anode;
- stacking said electrolyte on said anode for allowing oxide ions to move through said electrolyte, and then, applying a firing process to said anode and said electrolyte;
- providing said cathode on said electrolyte after the firing process;
- and
- providing a layer on said cathode, said layer comprising material which has electron conductivity higher than that of said cathode, and which is capable of inducing oxygen reduction.
A method of producing an electrolyte electrode assembly sandwiched between a pair of separators, said electrolyte electrode assembly including an anode, a cathode, and an electrolyte interposed between said anode and said cathode, said method comprising the steps of:
- providing said electrolyte by applying a firing process to powder of material which is prepared to have oxide ion conductivity;
- providing said anode on one surface of said electrolytes
- providing said cathode on the other surface of said electrolyte;
- and
- providing a layer on an exposed surface of said cathode, said layer comprising material which has electron conductivity higher than that of said cathode, and which is capable of inducing oxygen reduction.
Dependencies are inferred from the claim text.