Patent ID: 7931935
Filing Date: 2011-04-26
Classification: C23C,H01M,Y02E,Y02P

Abstract:
1. A process for producing a membrane electrode assembly, comprising: a potential holding step for applying a voltage to a catalyst electrode in an aqueous electroconductive solution and holding the potential of the catalyst electrode at a hydrogen evolution potential, a washing/removing step of, after the potential holding step, washing the catalyst electrode and removing the aqueous electroconductive solution held by the catalyst electrode; a drying step of, after the washing/removing step, drying the catalyst the catalyst electrode in an atmosphere having a lower oxygen partial pressure than the air; a stacking step of, after the drying step, stacking at least an anode, a proton conductive film, and a cathode; and a covering step of, at any stage before the stacking step, covering at least a part of the catalytically active material in the catalyst electrode with an ion conductive material to form a covered catalyst electrode, wherein the anode and/or cathode of the stacking step is the covered catalyst electrode that was formed by subjecting the catalyst electrode to the potential holding step, the washing/removing step, the drying step, and the covering step.