Patent ID: 7745037
Filing Date: 2010-06-29
Classification: H01M,Y02E

Abstract:
1. A membrane electrode assembly of a solid polymer electrolyte fuel cell, comprising: an anode electrode; a cathode electrode; and a polymer electrolyte membrane sandwiched by the electrodes; wherein each electrode is formed from a catalyst layer adjacent the polymer electrolyte membrane, and from a gas diffusion layer adjacent the catalyst layer, and wherein the catalyst layer of the cathode electrode contains a catalyst supporting particle in which a precious metal is supported on heat-treated carbon black or activated carbon subjected to heat processing at a temperature in a range of 2,500 to 3,000° C., an ion conductive material, and crystalline carbon fibers, wherein an amount of the crystalline carbon fibers is 20 to 60% by mass relative to an overall mass of the catalyst supporting particle, and wherein the catalyst layer of the cathode electrode has a pore volume for pores with a diameter in a range of 0.01 to 2.0 μm of at least 2.8 μl/cm