Enhanced hydrogen evolution properties obtained by electrochemical modification of carbon-supported platinum–copper bimetallic nanocatalysts and structural characterization
Enhanced hydrogen evolution properties obtained by electrochemical modification of carbon-supported platinum–copper bimetallic nanocatalysts and structural characterization
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DOI：
10.1039/c4ra16060f
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发表时间：
2015-02
期刊：
影响因子：
3.9
通讯作者：
Yang Yong;Bin Yang;Jincai Peng;Zhao Zhijing;Yumeng Zhao
中科院分区：
文献类型：
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作者：
Yang Yong;Bin Yang;Jincai Peng;Zhao Zhijing;Yumeng Zhao
采用离子束溅射（IBS）法制备Pt-Cu/C催化剂，真空退火后，用0.5M H2SO 4水溶液电化学腐蚀不同时间。电化学测试结果表明，电化学修饰5 h的样品具有最佳的电催化性能。与Pt/C催化剂相比，该催化剂的性能提高了36.79%，Pt负载量降低了44.70%，表现出Pt用量少、催化活性高的特点。腐蚀时间在5 ~ 6 h之间，催化活性最好。XPS研究表明，结合能与电催化活性之间存在一定的相关性，这对于调控结合能以获得高的催化性能具有重要意义。
Pt–Cu/C catalysts are synthesized by an ion beam sputtering (IBS) apparatus, followed by annealing in vacuum, and then electrochemical etching with 0.5 M H2SO4 aqueous solution for different times. Electrochemical results show that the sample that was modified electrochemically for 5 h possesses the best electro-catalytic properties. Compared with a Pt/C catalyst, its performance was enhanced by approximately 36.79% and Pt loadings decreased by about 44.70%, indicating the characteristics of lower Pt consumption with higher catalytic activity. Furthermore, the corrosion time is likely to be between 5 and 6 h for its best catalytic activity. XPS studies indicate that a certain correlation between binding energy and electrocatalytic activity is of great significance for regulating binding energy to obtain high catalytic performance.