Importance

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Abstract

In a catalyst electrode 23, a plurality of catalyst clusters 30 and a plurality of electrolyte clusters 32 are connected and entwined with each other. Each catalyst cluster 30 is formed by aggregation of a plurality of carbon particles 36 with a catalyst 34 carried thereon, and the surface of the catalyst cluster 30 is coated with an electrolyte layer 38. Each electrolyte cluster 32 is formed by aggregation of an electrolyte. A supply of ions is fed to the catalyst 34 for the electrochemical reaction via the electrolyte layer 38. The electrolyte clusters 32, on the other hand, ensure the pathway of ions moving from an electrolyte film 21 towards a gas diffusion electrode 25. This arrangement of the present invention does not require the thick electrolyte layer 38 for ensuring the sufficient transmission of ions but enables a sufficient amount of gas (oxygen) to be fed to the catalyst 34.

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First Claim