目的：解决质子交换膜燃料电池贵金属催化剂利用率低、电化学稳定性差的问题,从而堆动其产业化进程。方法通过湿化学共沉积法获得低Pt特征的PtCo合金催化剂,采用欠电位沉积方法制备Au修饰的PtCo合金催化剂,应用原子吸收光谱和电化学循环伏安加速测试技术研究Au修饰PtCo合金催化剂的电化学稳定性。结果成功制备了Au修饰的PtCo合金催化剂。 Au修饰后,PtCo合金催化剂的氧还原反应性能几乎没有改变,但Co的溶蚀率得到降低,而且电化学稳定性也得到提高。结论通过采用Au等具有高电化学腐蚀电位的金属修饰Pt合金催化剂,以提高催化剂电化学稳定性的研究思路是可行的。
ABSTRACT:Objective To facilitate the commercialization of proton exchange membrane fuel cells by revolving the key issues in-cluding low utilization and deteriorated stability of noble metal catalysts. Methods After preparation of PtCo alloy catalysts with low Pt loading by a chemical co-deposition method, the gold decorated PtCo alloy catalyst was prepared in terms of an under-potential-deposition method, and then the electrochemical stability of the gold-decorated PtCo alloy catalyst was characterized by atomic ab-sorption spectroscopy and electrochemical accelerated test technique. Results Au-decorated PtCo alloy catalyst was successfully prepared. After decoration of gold, the oxygen reduction reaction activity of PtCo alloy catalysts remained unchanged, and the ero-sion rate of Co element for PtCo alloy catalysts in electrolyte solutions decreased with an improved electrochemical stability. Con-clusion It was feasible to improve the stability of PtCo alloy catalysts by decoration with metals possessing a high corrosion potential such as Au.
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