Polyelectrolyte fuel cell and production method therefor

[0098] A membrane-catalyst layer assembly was formed by applying the same catalyst layer ink as in Example 1 on both surfaces of a polymer electrolyte membrane (Nafion 112 membrane manufactured by E.I. du Pont de Nemours and Company). Subsequently, cell B was assembled in the same manner as in Example 1, except that a gas diffusion layer carbon paper (Carbon Paper TGPH-060 manufactured by Toray Industries, Inc.) was integrally joined to both surfaces of this membrane-catalyst layer assembly by application of a pressure of 4 MPa / cm.sup.2 at 150.degree. C. to form a membrane-electrode assembly.

[0099] A catalyst layer was formed by applying the same catalyst layer ink as in Example 1 on a surface of a transfer film made of polypropylene. This catalyst layer was transferred to both surfaces of a polymer electrolyte membrane ("GORESELECT membrane" manufactured by Japan Gore-Tex Inc.) by application of a pressure of 2 MPa / cm.sup.2 at 130.degree. C. to prepare a membrane-catalyst layer assembly. A gas diffusion layer carbon paper (Carbon Paper TGPH-060 manufactured by Toray Industries, Inc.) was integrally joined to both of the catalyst layers of this membrane-catalyst layer assembly by application of a pressure. Thus, a membrane-electrode assembly was formed, and cell C was assembled.

[0100] Cell D was assembled by forming a membrane-electrode assembly in the same manner as in Example 1, except that ketjen black (Ketjen Black EC60OJD manufactured by Ketjen Black International Co.) having a specific surface area of 1270 m.sup.2 / g and an oil adsorption of 495 ml / 100 g was used as the second carbon particles.