MEMBRANE-ELECTRODE ASSEMBLY, ITS MANUFACTURING METHOD, AND SOLID POLYER FUEL CELL USING THE SAME

摘要

A membrane−electrode assembly in which gas−diffusion electrodes are joined to both sides of a proton−conductive membrane and which has high heat resistance and high chemical resistance and functions stably even at high temperature,characterized in that a membrane−electrode assembly portion in which gas−diffusion electrodes are joined to a proton−conductive membrane contains a three−dimensional crosslinking structure composed of metal−oxygen bond formed by a sol−gel reaction;the membrane−electrode assembly characterized in that the gas−diffusion electrode carries a noble metal catalyst on its surface in advance;or the membrane assembly characterized in that the membrane−electrode assembly portion contains,in addition to the three−dimensional crosslinking structure,carbon powder carrying a noble metal catalyst;their manufacturing methods;and a solid polymer fuel cell adapted to operate at high temperature by adopting this or a direct methanol fuel cell are disclosed.