中文摘要：

采用溶胶法制备了用于阴离子膜直接甲醇燃料电池的Pt-Co/C阴极电催化剂,并用X射线衍射、X射线能谱和透射电镜技术对催化剂进行了表征。结果表明,制备的Pt-Co合金颗粒分布均匀,粒径为2～6 nm,其组成与前驱体中相应金属的原子数比基本吻合。用电位线性伏安扫描法测试电化学活性及抗甲醇性。结果显示,随着碱性的增加,氧还原起始电位降低,峰电流减小,催化活性降低;相同碱性电解液中不同原子数比例的Pt-Co/C催化剂活性以Pt80Co20/C的活性最佳,其催化活性和抗甲醇性比Pt/C有显著提高,在0.1 mol/L KOH溶液中其峰电流密度达到95mA/mg。

英文摘要：

Carbon-supported Pt-Co catalyst samples were prepared by the colloidal method and characterized by X-ray diffraction, energy dispersive X-ray spectroscopy and transmission electron microscopy. The results indicated that the Pt-Co alloy particles distributed homogeneously on the carbon, the particle size was 2-6 nm, and the proportion of metal element in the alloy particles was coincided with that in the precursor. Potentiodynamic was carried out to measure the performance of the oxygen reduction on the electro-catalysts. The results showed that the onset po- tential for oxygen reduction on Pt-Co/C shifted negatively, and the peak currents of the oxygen reduction decreased with the increase in the alkali concentration. The activity of Pt80Co20/C was the best among Pt-Co/C catalysts, and the activity and methanol-tolerance were enhanced markedly compared to Pt/C, and the peak currents on Pt80 Co20/C can reach 95 mA/mg in 0. 1 mol/L KOH solution in our experiment.