高等学校化学学报

高等学校化学学报

• 研究论文 • 上一篇    下一篇

纳米晶碳化钨薄膜对硝基甲烷还原的电催化性能

郑华均, 顾正海, 赵峰鸣, 黄建国, 王伟, 马淳安
   

  1. 浙江工业大学化学工程与材料学院, 纳米科学与技术工程中心, 杭州 310032
  • 收稿日期:2005-08-09 修回日期:1900-01-01 出版日期:2006-09-10 发布日期:2006-09-10
  • 通讯作者: 郑华均

Electrocatalytic Properties of Nano-crystalline Tungsten Carbide Thin Film Electrode for Nitromethane Electroreduction

ZHENG Hua-Jun, GU Zheng-Hai, ZHAO Feng-Ming, HUANG Jian-Guo, WANG Wei, MA Chun-An
   

  1. Department of Applied Chemistry, Research Center of Nano Sience & enchnology, Zhejiang University of Technology, Hangzhou 310032, China
  • Received:2005-08-09 Revised:1900-01-01 Online:2006-09-10 Published:2006-09-10
  • Contact: ZHENG Hua-Jun

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摘要： 采用磁控溅射物理气相沉积技术在金属镍基体上制备碳化钨纳米晶薄膜. 薄膜具有纳米晶结构, 由粒径为20~35 nm的晶粒构成, 晶粒分布均匀, 晶相结构为非化学计量比的碳化钨(WC1-x). 采用电化学方法研究硝基甲烷在纳米晶碳化钨薄膜电极上的电化学还原性能和反应机理. 实验结果表明, 碳化钨薄膜电极对硝基甲烷电化学还原反应具有较好的催化性能, 当电极电位为-0.89 V(vs.SCE)时, 硝基甲烷还原为甲基羟胺的电流达14.9 mA/cm2, 其反应表观活化能为12.3 kJ/mol. 硝基甲烷在碳化钨薄膜电极上经过一步不可逆的电化学反应还原成甲基羟胺, 其控制步骤是电极反应的电荷传递过程.

关键词: 碳化钨, 纳米晶薄膜, 电催化性能, 硝基甲烷

Abstract: The nano-crystalline tungsten carbide thin film was deposited on Ni substrate by magnetron sputtering physical vapor deposition. The morphology and crystal structure of the thin films were characterized by SEM and XRD. The results show that these thin films have nano-crystalline structure, the size of the uniformly grains ranges between 20—35 nm. The main components of the thin film were WC1-x. Electrocatalytic properties and reaction mechanism of nitromethane electroreduction on nano-crystalline tungsten carbide thin film electrode were investigated by electrochemical methods. The experiment result indicates that these electrodes showed a good electro-catalytic activity. Current peak of 14.9 mA/cm2 of nitromethane electroreduction appeared at -0.89 V(vs. SCE) and the reaction activation energy was 12.3 kJ/mol. The electrocatalytic reduction of nitromethane on these electrodes was a one-step reaction, and the reactions was irreversible. The control step of nitromethane eleroreduction on WC thin film electrode was electron exchange process.

Key words: Tungsten carbide, Nano-crystalline thin film, Electro-catalytic performance, Nitromethane

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