MEMBRANE ELECTRODE ASSEMBLY AND SOLID POLYMER FUEL CELL

摘要

A membrane electrode assembly characterized in that at least either the catalyst layer of oxygen electrode or the catalyst layer of fuel electrode contains a support bearing a catalytic metal doped with a platinum group element and contains a proton conductive polymer electrolyte and further contains at least one member selected from among (a) complex forming agent having a ligand capable of coordination with an ion of the platinum group element to thereby form a complex, the ligand containing oxygen as a coordinating atom, (b) complex of the platinum group element having a ligand containing oxygen as a coordinating atom and (c) carbon of 100 m²/g or greater BET specific surface area satisfying at least either the requirement (i) of Raman spectrum R-value of 0.5 or less or the requirement (ii) of (002) face plane spacing d₀₀₂ of 0.35 nm or less, the carbon not bearing the catalytic metal. By the use of this membrane electrode assembly, there can be provided a solid polymer fuel cell of high durability and prolonged life duration.