Polycarbazole as an efficient promoter for electrocatalytic oxidation of formic acid on Pt and Pt–Ru nanoparticles
Polycarbazole as an efficient promoter for electrocatalytic oxidation of formic acid on Pt and Pt–Ru nanoparticles
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DOI：
10.1016/j.ijhydene.2010.11.023
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发表时间：
2011-02
影响因子：
7.2
通讯作者：
Weiqiang Zhou;Jingkun Xu;Yukou Du;Ping Yang
中科院分区：
文献类型：
--
作者：
Weiqiang Zhou;Jingkun Xu;Yukou Du;Ping Yang
通过在玻碳电极（GC）上的电聚合获得的分散在聚咔唑（PCZ）膜上的monoclonal Pt和monoclonal Pt-Ru纳米颗粒的电催化活性（即，Pt/PCZ/GC，Pt-Ru/PCZ/GC）对甲酸的氧化反应进行了研究。通过SEM、EDX和电化学分析对所制备的电极进行了表征。相对于沉积在裸GC上的Pt和Pt-Ru（即，Pt/GC和Pt-Ru/GC）、Pt/PCZ/GC和Pt-Ru/PCZ/GC对甲酸的电氧化表现出较高的催化活性和较强的抗中毒能力。提出了增强的性能来自金属纳米颗粒（Pt，Pt-Ru）和PCZ之间的协同效应。同时，CO的溶出伏安曲线表明，PCZ能显著减弱CO在Pt/PCZ和Pt-Ru/PCZ催化剂上的吸附强度，使CO在较低电位下更容易氧化，进一步表明PCZ可作为一种有效的甲酸电催化氧化促进剂。
Electrocatalytic activities of the monometallic Pt and bimetallic Pt–Ru nanoparticles dispersed onto polycarbazole (PCZ) films obtained by the electropolymerization on glassy carbon electrode (GC) (i.e., Pt/PCZ/GC, Pt–Ru/PCZ/GC) towards formic acid oxidation have been investigated using cyclic voltammetry and chronoamperometry methods. As-formed electrodes are characterized by SEM, EDX and electrochemical analysis. Relative to Pt and Pt–Ru deposited on the bare GC (i.e., Pt/GC and Pt–Ru/GC), Pt/PCZ/GC and Pt–Ru/PCZ/GC, respectively, exhibit higher catalytic activity and stronger poisoning-tolerance ability towards formic acid electrooxidation. The enhanced performance is proposed to come from the synergetic effect between metal nanoparticles (Pt, Pt–Ru) and PCZ. At the same time, the results of the stripping voltammograms of CO show that PCZ can weaken largely the adsorption strength of CO on catalysts and can make CO oxidation easier under lower potential, implying further that PCZ can be used as an efficient promoter for electrocatalytic oxidation of formic acid on Pt/PCZ and Pt–Ru/PCZ catalysts.