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An electrode for a polymer electrolyte fuel cell, which is a porous gas diffusion electrode comprising a catalyst powder and an ion exchange resin, wherein a solvent-soluble fluorine-containing polymer having substantially no ion exchange groups exists at least at a part of the inner surface of pore

An electrode for a polymer electrolyte fuel cell, which is a porous gas diffusion electrode comprising a catalyst powder and an ion exchange resin, wherein a solvent-soluble fluorine-containing polymer having substantially no ion exchange groups exists at least at a part of the inner surface of pores of the electrode.

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1. A polymer electrolyte fuel cell comprising a solid polymer electrolyte membrane and a pair of electrodes disposed on both sides of the membrane, wherein at least one of the pair of electrodes is a porous gas diffusion electrode, which comprises: a catalyst powder and an ion exchange resin, wit

1. A polymer electrolyte fuel cell comprising a solid polymer electrolyte membrane and a pair of electrodes disposed on both sides of the membrane, wherein at least one of the pair of electrodes is a porous gas diffusion electrode, which comprises: a catalyst powder and an ion exchange resin, with at least a portion of the surfaces of the pores of the porous structure of the electrode covered with a solvent-soluble fluorine-containing polymer having no ion exchange groups, wherein the fluorine-containing polymer contains polymer units of the following formula: 2. The polymer electrolyte fuel cell according to claim 1, wherein the fluorine-containing polymer is a perfluorocarbon polymer having an alicyclic structure. 3. The polymer electrolyte fuel cell according to claim 1, wherein the fluorine-containing polymer is a polymer obtained by partial fluorination of a non-acrylic resin. 4. The polymer electrolyte fuel cell according to claim 1, wherein the fluorine-containing polymer has a molecular weight ranging from 2,000 to 200,000. 5. The polymer electrolyte fuel cell according to claim 1, wherein the gas diffusion electrode contains from 0.01 to 30 wt % of the fluorine-containing polymer. 6. The polymer electrolyte fuel cell according to claim 1, wherein the ion exchange resin and the solid polymer electrolyte membrane are made of a fluorocarbon sulfonic acid ion exchange resin or a fluorocarbon phosphonic acid ion exchange resin. 7. The polymer electrolyte fuel cell according to claim 1, wherein the ion exchange resin and the solid polymer electrolyte membrane are made of a perfluorocarbon sulfonic acid ion exchange resin comprising a copolymer having polymer units based on CF2=CF2and polymer units based on CF2=CF--(OCF2CFX)m--Op--(CF2)n--SO3H, wherein m is 10 or an integer ranging up to 3, n is an integer ranging from 1 to 12, p is 0 or 1 and X is F or CF3. 8. The polymer electrolyte fuel cell according to claim 1, wherein the electrode contains, as a binder, a polytetrafluoroethylene, a tetrafluoroethylene/hexafluoropropylene copolymer or a tetrafluoroethylene/perfluoroalkyl vinyl ether copolymer. 9. A method of making a polymer electrolyte fuel cell, the method comprising disposing a first electrode and a second electrode on opposing sides of a solid polymer electrolyte membrane; and producing the polymer electrolyte fuel cell of claim 1.