中文摘要：

采用脉冲微波辅助化学还原法制备了钴-聚吡咯-碳载Pt催化剂（Pt/Co-PPy-C）,并将其作为阴极催化剂,组装单电池。考察了电池运行温度和氢气/空气计量比对单电池性能的影响,并与商业Pt/C催化剂进行了耐久性实验比较。结果表明,运行温度为70℃,氢气与空气的计量比为1.2∶2.5时单电池性能最佳。600 m A/cm2恒电流稳定运行150 h耐久性测试中,以Pt/CoPPy-C为阴极催化剂的单电池平均电压衰退率为0.119 m V/h,是商业Pt/C催化剂的26%。耐久性测试前后,单电池的阴极电荷传递阻抗为7.176和8.767Ω,均比商业Pt/C催化剂阻抗小;Pt颗粒粒径从2.46 nm增长到3.18 nm,均小于商业Pt/C催化剂的粒径。这表明,以Pt/Co-PPy-C催化剂为阴极催化剂制备的单电池性能优良,在质子交换膜燃料电池中有广泛的应用前景。

英文摘要：

Cobalt-polypyrrole-earbon black supported Pt catalyst（Pt/Co-PPy-C） was prepared by pulsemicrowave assisted chemical reduction and used as a cathode catalyst for oxygen reduction reaction（ORR） in a single cell;the influence of operation temperature and H2/air stoichiometric ratio on the cell performances was investigated,in comparison with the commercial Pt/C catalyst.The results indicated that the cell performs best at70 ℃ and with a H2/Air ratio of 1.2：2.5.During the 150 h durability test at a galvanostatic operation condition of600 mA/cm,the voltage degradation rate with Pt/Co-PPy-C as the cathode catalyst is 0.119 mV/h,about 26%of that with the commercial Pt/C catalyst.The cathode charge transfer impedances before and after durability test are about 7.176 and 8.767 mohm,respectively,much smaller than those with the Pt/C catalyst.The average particle size of Pt in Pt/Co-PPy-C is increased from 2.46 to 3.18 nm,also smaller than that for the Pt/C catalyst.The Pt/Co-PPy-C catalyst exhibits superior performance in ORR and may have an enormous application potential in fuel cell.