Highly active carbon nanotube-supported Pd electrocatalyst for oxidation of formic acid prepared by etching copper template method
Highly active carbon nanotube-supported Pd electrocatalyst for oxidation of formic acid prepared by etching copper template method
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DOI：
10.1016/j.ijhydene.2012.11.009
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发表时间：
2013-02
影响因子：
7.2
通讯作者：
Hong Zhao;T. Zhao
中科院分区：
文献类型：
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作者：
Hong Zhao;T. Zhao
本文采用铜模板法制备了碳纳米管负载钯纳米催化剂（Pd/MCNTs）。首先在多壁碳纳米管上形成Cu纳米颗粒（NPs）作为模板，然后通过Pd离子和Cu之间的电置换反应获得Pd NPs。TEM、XRD和XPS表征表明，典型直径为2-5 nm的Pd纳米颗粒均匀地修饰在MCNT上，没有聚集。电化学表征表明，Pd/MCNTs材料对甲酸的催化氧化活性远高于传统的Pd/MCNTs和商业Pd/Vulcan催化剂。改进的活性主要归因于在催化剂的合成中不需要表面活性剂的事实，消除了在常规合成方法中与使用表面活性剂相关的催化位点的可能钝化。此外，催化剂颗粒分布较窄、分散性较好，且多壁碳纳米管无缺陷，也有利于催化活性的提高。本合成方法的另一个特征是Pd的负载量可以通过改变Cu离子的量来调节。
In this work, a carbon nanotube-supported Pd nano-catalyst (Pd/MCNTs) is prepared by the etching copper template strategy. Cu nanoparticles (NPs) are formed onto MCNTs first as the template and Pd NPs are then obtained through a galvanic displacement reaction between Pd ions and Cu. TEM, XRD, and XPS characterizations show the crystalline of Pd NPs with a typical diameter of 2–5 nm is homogeneously decorated onto MCNTs without aggregation. Electrochemical characterizations reveal that the Pd/MCNTs materials exhibit much higher catalytic activity for the formic acid oxidation than both conventional Pd/MCNTs and commercial Pd/Vulcan catalysts do. The improved activity is mainly attributed the fact that no surfactant is required in synthesis of the catalyst, eliminating the possible passivation of catalytic sites associated with the use of surfactant in conventional synthesis methods. In addition, the narrower distribution and better dispersion of catalyst particles, as well as no defects of MCNTs are also beneficial for the improvement in the catalytic activity. Another feature of the present synthesis method is the loading of Pd can be adjusted by varying the amount of Cu ions.