POROUS ELECTRODE FOR FUEL CELL AND ITS PREPARATION

摘要

PURPOSE: To achieve high performance and low cost by forming an uniform current distribution over the surface of an electrode by gradually increasing electrode catalyst loading in a direction along a gas flow channel from an inlet to an outlet. CONSTITUTION: An electrode layer is formed in an inclined nonuniform region in such a manner that an electrode catalyst layer has the highest density in a gas inlet and has the lowest density in a gas outlet along an electrode axis parallel with an electrode base material. This effects an adjustment so that a non-uniform gas diffusion electrode is formed on the surface of an electrode depending on reactor gas composition or temperature gradient. As a result, an uniform current distribution can be achieved over the the surface of the electrode, and an active electrode catalyst can efficiently interact to realize high performance. A nonuniform layer can be simply and properly formed at low cost by screen printing technique.