MEMBRANE ELECTRODE ASSEMBLY, FUEL CELL, AND ACTIVATING METHOD FOR FUEL CELL

摘要

PROBLEM TO BE SOLVED: To improve durability of a fuel cell that uses a non-platinum catalyst metal.

SOLUTION: A fuel cell 10 comprises a planar membrane electrode assembly 50 held between a separator 34 and a separator 36. The membrane electrode assembly 50 includes a solid polymer electrolyte membrane 20, an anode 22 and a cathode 24. The cathode 24 includes a laminate composed of a cathode catalyst layer 30 and a cathode gas diffusion layer 32. The cathode catalyst layer 30 is composed of an ionomer, carrier particles, a catalyst metal and a SiO2component. The SiO2component covers at least a part of surroundings of the catalyst metal and carrier particles. A SiO2content is 1 to 30 mass% relative to a reference mass (total mass of the carrier particles, catalyst metal and SiO2component), and the volume resistivity of the cathode catalyst layer 30 is 1 to 300 Ω cm (the maximum number inclusive).

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