物理化学学报 >> 2005, Vol. 21 >> Issue (07): 721-724.doi: 10.3866/PKU.WHXB20050705

研究论文 上一篇    下一篇

碳化钨在对硝基苯酚电还原过程中的电催化行为

马淳安; 黄烨; 童少平; 张维民   

  1. 浙江工业大学应用化学系, 绿色化学合成技术国家重点实验室培育基地, 纳米科学与技术工程研究中心, 杭州 310032
  • 收稿日期:2004-11-23 修回日期:2005-01-04 发布日期:2005-07-15
  • 通讯作者: 马淳安 E-mail:science@zjut.edu.cn

The Catalytic Behavior of Tungsten Carbide for the Electroreduction of p-nitrophenol

MA Chun-an; HUANG Ye; TONG Shao-ping; ZHANG Wei-min   

  1. Department of Applied Chemistry, State Key Laboratory Breeding Base of Green Chemistry-Synthesis Technology, Research Center of Nano Science & Technology, Zhejiang University of Technology, Hangzhou 310032
  • Received:2004-11-23 Revised:2005-01-04 Published:2005-07-15
  • Contact: MA Chun-an E-mail:science@zjut.edu.cn

摘要: 以碳化钨(WC)粉末为电催化材料制成了碳化钨粉末微电极(WC-PME). 采用循环伏安和线性扫描等方法研究了酸性溶液中对硝基苯酚(PNP)在WC-PME上的电还原行为. 研究表明, 在相同测试条件下, PNP在WC-PME上电还原的电位比Cu-Hg微电极正得多;WC-PME对氢具有较强的吸附能力, 有利于有机物的电还原反应. PNP在WC-PME上和Pt微电极上的还原电位相近, 但在WC-PME上的峰电流比在Pt微电极上高5倍多, 这主要与WC粉末的结构形貌有关.

关键词: 碳化钨, 粉末微电极, 对硝基苯酚, 电化学还原, 电催化

Abstract: Tungsten carbide powder microelectrode (WC-PME) was prepared from tungsten carbide (WC) powders to be used as an electrocatalyst. Electrochemical reduction behaviour of p-nitrophenol (PNP) on the WC-PME was investigated using cyclic voltammetry (CV) and linear sweep voltammetry. It was found that reduction potential of PNP on the WC-PME was more positive than that on the Cu-Hg microelectrode and that WC had higher catalytic activity in the electroredution of PNP than Cu-Hg. Although the reduction potentials of PNP on the WC-PME and the Pt microelectrode were close to each other, the reduction current of PNP on the WC-PME was about 5 times as large as that on the Pt microelectrode. This result was mainly attributed to the surface morphological structure of WC.

Key words: Tungsten carbide, Powder microelectrode, p-nitrophenol, Electroreduction, Electrocatalyst