| abstract |
An electrolyte material for a polymer electrolyte fuel cell, which is made of a copolymer comprising repeating units based on CF 2 ═CFCF 2 OCF 2 CF 2 SO 3 H and repeating units based on tetrafluoroethylene and which has an ion exchange capacity of from 0.9 to 1.5 (meq/g dry resin). This electrolyte material has ion conductivity and durability equal to conventional electrolyte material, is easy to synthesize, has a softening point higher than electrolyte material heretofore widely used for application to fuel cells and is suitable for operation of a polymer electrolyte fuel cell at a temperature higher than the conventional material. |