Active solid polymer electrolyte membrane in solid polymer type fuel cell and process for the production thereof

An active solid polymer electrolyte membrane in a solid polymer fuel cell comprising a solid polymer electrolyte membrane and a plurality of precious metal catalyst particles supported inside the surface layers of said polymer electrolyte membrane by ion exchange and distributed uniformly throughout the inside of the surface layers thereof, wherein an amount CA of said precious metal catalyst particles supported on the surfaces of said solid polymer electrolyte membrane is in a range of 0.14 mg/cm2≦CA ≦0.35 mg/cm2.

A process for the production of an active solid polymer electrolyte membrane in a solid polymer fuel cell comprising a solid polymer electrolyte membrane and a plurality of precious metal catalyst particles supported on the surfaces of said solid polymer electrolyte membrane by ion exchange and distributed uniformly over the surfaces thereof, wherein said process comprises in sequence a step in which said solid polymer electrolyte membrane is immersed in a solution of a precious metal complex so as to carry out ion exchange, a step in which said solid polymer electrolyte membrane is washed with pure water, a step in which said solid polymer electrolyte membrane is subjected to a reduction treatment, a step in which said solid polymer electrolyte membrane is washed with pure water and a step in which said solid polymer electrolyte membrane is dried.

A process for the production of an active solid polymer electrolyte membrane in a solid polymer fuel cell comprising a solid polymer electrolyte membrane and a plurality of precious metal catalyst particles supported inside the surface layers of said solid polymer electrolyte membrane by ion exchange and distributed uniformly throughout the inside of the surface layers thereof, wherein said process comprises in sequence a step in which said solid polymer electrolyte membrane is immersed in a liquid mixture of a solution of a precious metal complex and at least one type of additive chosen from the group comprising water-soluble organic solvents, nonionic surfactants and nonmetallic bases so as to carry out ion exchange, a step in which said solid polymer electrolyte membrane is washed with pure water, a step in which said solid polymer electrolyte membrane is subjected to a reduction treatment, a step in which said solid polymer electrolyte membrane is washed with pure water and a step in which said solid polymer electrolyte membrane is dried.

A process for the production of an active solid polymer electrolyte membrane, comprising in sequence a step in which said solid polymer electrolyte membrane is immersed in a solution of a precious metal complex so as to carry out ion exchange, a step in which said solid polymer electrolyte membrane is washed, a step in which said solid polymer electrolyte membrane is subjected to a reduction treatment, a step in which said solid polymer electrolyte membrane is washed, and a step in which said solid polymer electrolyte membrane is dried, wherein said ion exchange is carried out using a liquid mixture of said precious metal complex solution and at least one type of additive chosen from the group comprising water-soluble organic solvents, nonionic surfactants and nonmetallic bases.