Patent ID: 7981571

Claim:
A solid polymer electrolyte fuel cell comprising: a membrane electrode assembly having an anode having a catalyst layer, a cathode having a catalyst layer, arranged facing the anode, and a polyelectrolyte membrane arranged between the anode and the cathode, and a pair of separator plates that are arranged facing each other so as to sandwich the membrane electrode assembly, and having an anode side gas channel for supplying a fuel gas to the anode, and a cathode side gas channel for supplying an oxidant gas to the cathode, formed thereon, wherein the catalyst layer of the anode contains at least one electrode catalyst selected from the group consisting of Pt particles and Pt alloy particles, having a particle diameter of from 6 to 10 nm, the catalyst layer of the cathode contains an electrode catalyst consisting of Pt particles, the catalyst layer of the anode has a thickness of from 1 to 5 μm, Pt volume density in the catalyst layer of the anode is from 1 to 5 g/cm 3 , the catalyst layer of the cathode has a thickness of 10 μm or more, Pt volume density in the catalyst layer of the cathode is from 0.1 to 0.5 g/cm 3 , a mixing ratio of conductive carbon particles in the catalyst layer of the anode to the at least one electrode catalyst selected from the group consisting of Pt particles and Pt alloy particles is from 0 to 5%, and a mixing ratio of conductive carbon particles in the catalyst layer of the cathode to the electrode catalyst consisting of Pt particles is from 30 to 60%.