Fuel cell

Abstract

A membrane electrode assembly (16) of a fuel cell (10) includes a solid polymer electrolyte membrane (50), a cathode (52), and an anode (54). The surface size of a cathode side electrode catalyst layer (52b) of the cathode (52) is smaller than the surface size of an anode side electrode catalyst layer (54b) of the anode (54). An inner end (56a) of a gas impermeable film (56) provided around the anode side electrode catalyst layer (54b) and an outer end (52be) of a cathode side electrode catalyst layer (52b) are overlapped with each other on both sides of the solid polymer electrolyte membrane (50).

Description

technical field

[0001] The present invention relates to a fuel cell in which a first electrode having a first electrode catalyst layer and a first gas diffusion layer is provided on one side of a solid polymer electrolyte membrane, and on the other side of the solid polymer electrolyte membrane An electrolyte membrane electrode structure in which a second electrode having a second electrode catalyst layer and a second gas diffusion layer is provided on the surface, and the planar size of the first electrode catalyst layer is set to be smaller than that of the second electrode catalyst layer is composed of Clamped by a pair of metal partitions. Background technique

[0002] For example, a solid polymer fuel cell is composed of an electrolyte membrane electrode assembly (MEA) in which an anode electrode and a cathode electrode are respectively provided on both sides of a solid polymer electrolyte membrane composed of a polymer ion exchange membrane. The power generation eleme...

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