Patent ID: 7150930

Claim:
A power supply system comprising: a first fuel cell unit including a first proton conductor with a first electrolyte that displays proton conductive properties in a first humidified state; and a second fuel cell unit including a second proton conductor with a second electrolyte that displays proton conductive properties in a second humidified state that is less humidified than the first humidified state, wherein the first proton conductor includes a material selected from the group consisting of a fluorocarbon resin-based ion exchange film, a non-ester structure type fullerene, a hydrocarbon based ion exchange film and mixtures thereof; and the second proton conductor contains a material selected from the group consisting of a carbon cluster to which a functional group capable of releasing protons is introduced, a compound mainly containing silicon oxide and Brönsted acid, an acrylic acid based polymer having a phosphoric acid group, a solid inorganic acid compound, an acid-base type hydrocarbon based ion exchange film and mixtures thereof.