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通过低温氧化法在活性碳表面修饰聚吡咯(PPy-C),并以PPy-C为载体制备了纳米Pd催化剂(Pd/PPy-C).采用X射线衍射、扫描电镜、透射电镜等手段对载体PPy-C及催化剂Pd/PPy-C进行了表征,电化学测试结果表明,Pd/PPy-C催化剂电极不但能够增强催化剂对甲酸催化氧化的活性,而且还能够大幅度提高催化剂的稳定性,因此以PPy-C为载体的Pd/PPy-C催化剂是一类具有潜在应用前景的直接甲酸燃料电池阳极催化剂.通过分析电化学比表面随循环伏安次数的变化及多电势阶跃实验结果表明,催化剂电极活性衰减的主要原因是载体被氧化及电极表面积累强吸附物种的结果.
The polypyrrole (PPy-C) was modified on the surface of activated carbon by low temperature oxidation and the Pd / PPy-C catalyst was prepared using PPy-C as support. XRD, SEM and TEM The catalyst PPy-C and Pd / PPy-C were characterized. The results of electrochemical tests showed that Pd / PPy-C catalyst not only enhanced the catalytic activity of the catalyst for formic acid but also greatly improved the stability of the catalyst. Therefore Pd / PPy-C catalyst supported on PPy-C is a potential anode catalyst for direct formic acid fuel cell.By analyzing the change of the number of cyclic voltammetry and the multi-potential step test results, , The main reason for the decay of the catalytic electrode activity is the result of the carrier being oxidized and the surface of the electrode strongly adsorbed species.