关键词: 燃料电池, Pt－Fe－Co／C催化剂, 多孔电极, 氧还原, 锚定效应

Abstract: The cathodic reduction of oxygen is studied on porous carbonbased electrodes carrying platinumiron and/or cobalt alloy catalysts. Electrodes using such electrocatalysts, particularly when used as cathodes in acidic electrolytes, remain stable for longer periods. The cathodic polarization of oxygen reduction on such electrodes is 20 mV to 40 mV lower than that on the conventional electrode on which only platinum alone is used as an electrocatalysts. An accelerated aging test (AAT) is used to evaluate the corrosion resistance and sintering resistance of each catalyst. The dissolution of the catalyst in the AAT filtrate is analysed and provides a measure of the corrosion resistance. The particle size of catalyst powders before and after AAT is determined and indicates the sintering resistance. Socalled “anchor effect” of iron and/or cobalt to platinum on carbon substrates are proposed to explain the enhanced effect of iron and cobalt in platinum alloy catalysts compared with catalysts that contain platinum alone.