Electrocatalytic Properties of Pt Nanowires Supported on Pt and W Gauzes
Electrocatalytic Properties of Pt Nanowires Supported on Pt and W Gauzes
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DOI：
10.1021/nn800458p
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发表时间：
2008-10-01
期刊：
影响因子：
17.1
通讯作者：
Xia, Younan
中科院分区：
文献类型：
--
作者：
Lee, Eric P.;Peng, Zhenmeng;Xia, Younan
本文介绍了直接在铂网或钨网表面生长铂或钨负载铂纳米线的方法。纳米线的生长方向被确定为沿着< 111 >轴。电化学测试研究了它们对甲醇氧化的催化性能。通过循环伏安法研究发现，负载在铂网上的铂纳米线具有最大的电化学活性表面积，对甲醇氧化反应的活性最高。它们还表现出随着时间的推移略微较慢的电流衰减，表明对CO样中间体的耐受性较高。此外，电化学阻抗谱测量结果表明，负载Pt纳米线的催化性能与H2PtCl6前体浓度为40 mM制备的甲醇氧化比在80 mM的浓度制备的样品显着更好。这部分是由于不完全去除聚（乙烯基吡咯烷酮）（PVP）从更浓缩的样品。相比之下，负载在W纱布上的Pt纳米线表现最差。
This paper describes the preparation of Pt- or W-supported Pt nanowires by directly growing them on the surface of Pt or W gauze. The growth direction of the nanowires was determined to be along the < 111 > axis. Electrochemical measurements were performed to investigate their catalytic performance toward methanol oxidation. It was found from cyclic voltammetry that the Pt nanowires supported on Pt gauze had the largest electrochemically active surface area with the greatest activity toward methanol oxidation reaction. They also exhibited a slightly slower current decay over time, indicating a higher tolerance to CO-like intermediates. Furthermore, electrochemical impedance spectroscopy measurements showed that the catalytic performance of the supported Pt nanowires prepared with a H2PtCl6 precursor concentration of 40 mM is significantly better for methanol oxidation than the samples prepared at a concentration of 80 mM. This was due partially to the incomplete removal of poly(vinyl pyrrolidone) (PVP) from the more concentrated sample. In contrast, the Pt nanowires supported on W gauze performed the worst.