Patent ID: 8092945

Claim:
A fuel cell system comprising: a stack body, formed by stacking a membrane-electrode assembly and a separator, the membrane-electrode assembly including an electrolyte layer and electrode layers, one of which is provided on one side of the electrolyte layer and the other of which is provided on the other side of the electrolyte layer; and supply means configured to supply ions which scavenge hydrogen peroxide to the membrane-electrode assembly, wherein the supply means includes at least one of a first inflow line for supplying a substance containing hydrogen to a first electrode layer of the electrode layers, and a second inflow line for supplying a substance containing oxygen to a second electrode layer of the electrode layers; and the supply means includes ion adding means which is provided in the at least one of the first inflow line and the second inflow line, and which adds the ions to the substance flowing in the at least one of the first inflow line and the second inflow line.