Abstract: According to one embodiment, a fuel cell includes a membrane electrode assembly including a plurality of unit cells which are composed of an electrolyte membrane, an anode including anode catalyst layers arranged at intervals on one of surfaces of the electrolyte membrane, and anode gas diffusion layers stacked on the anode catalyst layers, and a cathode including cathode catalyst layers arranged at intervals on the other surface of the electrolyte membrane and opposed to the anode catalyst layers, respectively, and cathode gas diffusion layers stacked on the cathode catalyst layers, wherein a thickness of at least one of the anode catalyst layer and the cathode catalyst layer of one of the unit cells, which neighbor each other, gradually decreases toward the other of the unit cells.

Abstract: According to one embodiment, a fuel cell includes a membrane electrode assembly including a plurality of unit cells which are composed of an electrolyte membrane, an anode including anode catalyst layers arranged at intervals on one of surfaces of the electrolyte membrane, and anode gas diffusion layers stacked on the anode catalyst layers, and a cathode including cathode catalyst layers arranged at intervals on the other surface of the electrolyte membrane and opposed to the anode catalyst layers, respectively, and cathode gas diffusion layers stacked on the cathode catalyst layers, wherein a thickness of at least one of the anode catalyst layer and the cathode catalyst layer of one of the unit cells, which neighbor each other, gradually decreases toward the other of the unit cells.

Abstract: Disclosed is a fuel cell (1) comprising a cell composition part (10) composed of an electrolyte membrane (17) sandwiched between an anode (fuel electrode) (13) and a cathode (air electrode) (16), and a fuel supply mechanism (40) disposed on the anode (fuel electrode) side of the cell composition part (10) and which supplies a fuel to the anode (fuel electrode) (13). The fuel cell (1) further comprises a moisture retaining layer (50) which is disposed on the cathode (air electrode) of the cell composition part (10) and which is impregnated with the water generated at the cathode (air electrode) (16), and a heat-radiating member (70) having an externally protruding heat-radiating portion (71) for releasing the heat generated by the cell composition part (10).