Patent ID: 8557453

Claim:
A fuel cell system having a water recovering and circulating structure, the system comprising: an electric generator comprising: a membrane electrode assembly including an anode electrode into which a hydrogen containing fuel is introduced, a cathode electrode into which an oxidant is introduced, and an electrolyte polymer membrane interposed between the anode and cathode electrodes, the electrotype polymer membrane including a hydrogen ion exchange membrane; wherein the cathode electrode includes: a first catalyst layer arranged in contact with the electrolyte polymer membrane and adapted to effect a reduction reaction for the oxidant; and a first gas diffusion layer adapted to diffuse the oxidant on the first catalyst layer, at least a part of the first gas diffusion layer directly contacting the electrolyte polymer membrane; and a water-evaporation preventing member to prevent water evaporation, the first gas diffusion layer being disposed between the water-evaporation preventing member and the electrolyte polymer membrane, the water-evaporation preventing member directly contacting the first gas diffusion layer.