Lee Eric P, Peng Zhenmeng, Chen Wei, Chen Shaowei, Yang Hong, Xia Younan
Department of Biomedical Engineering, Washington University, St. Louis, Missouri 63130, USA.
ACS Nano. 2008 Oct 28;2(10):2167-73. doi: 10.1021/nn800458p.
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 H(2)PtCl(6) 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.
本文描述了通过在铂或钨丝网表面直接生长来制备负载铂或钨的铂纳米线。确定纳米线的生长方向沿<111>轴。进行电化学测量以研究它们对甲醇氧化的催化性能。从循环伏安法发现，负载在铂丝网上的铂纳米线具有最大的电化学活性表面积，对甲醇氧化反应具有最高的活性。它们还表现出随着时间的推移电流衰减略慢，表明对类一氧化碳中间体具有更高的耐受性。此外，电化学阻抗谱测量表明，用40 mM的H(2)PtCl(6)前驱体浓度制备的负载铂纳米线对甲醇氧化的催化性能明显优于在80 mM浓度下制备的样品。这部分是由于从浓度更高的样品中聚乙烯吡咯烷酮（PVP）未完全去除。相比之下，负载在钨丝网上的铂纳米线表现最差。
