| abstract |
First, a solid-state electrolyte layer (20) that has conductivity for ions of one of hydrogen and oxygen is formed. After that, a dense layer (22a) made of an electrode material that has electron conductivity, catalyst activity to accelerate the electrochemical reaction, and a characteristic of allowing permeation of ions and/or atoms of the other one of hydrogen and oxygen is formed on a surface of the electrolyte layer. Then a fuel cell structure that includes the electrolyte layer and the dense layer is built. After that, the electrochemical reaction is caused to progress by supplying a fuel and oxygen to the fuel cell structure, so that in the dense layer, many micropores extending through the dense layer in the film thickness direction are created due to the generated water that is created between the electrolyte layer and the dense layer. |