催化学报

催化学报 ›› 2009, Vol. 30 ›› Issue (4): 319-322.

• 研究论文 • 上一篇    下一篇

基于碳化钼的燃料电池阴极催化剂的制备及其作用机理

章冬云 1, 吴曦 1, 马紫峰 1, Levi T. THAMPSON2   

  1. 1 上海交通大学化学工程系, 上海200240; 2密西根大学化学工程系, Ann Arbor, MI 48109, 美国
  • 收稿日期:2009-04-25 出版日期:2009-04-25 发布日期:2013-01-21

Preparation and Mechanism Analysis of Molybdenum Carbide-Based Catalyst for Fuel Cell Cathode Reaction

ZHANG Dongyun1, WU Xi1, MA Zifeng1,*, Levi T. THAMPSON2   

  1. 1Department of Chemical Engineering, Shanghai Jiao Tong University, Shanghai 200240, China; 2Department of Chemical Engineering, University of Michigan, Ann Arbor, MI 48109, USA
  • Received:2009-04-25 Online:2009-04-25 Published:2013-01-21

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1399

被引次数

14

摘要： 以 Mo2C/VC 作为质子交换膜燃料电池氧还原催化剂, 并采用单电池和电化学循环伏安扫描技术考察了其氧还原活性,同时结合 X 射线衍射和 X 射线光电子能谱对其电催化机理进行初步分析. 结果表明, Mo2C/VC 对氧还原也具有电催化活性, 在 0.34, 0.45 和 0.55 V 处出现三对可逆的氧化还原峰. Mo2C/VC 的体相为β-Mo2C, 表相为+δ 价(5 ≤ δ ≤ 6)的 MoOxCy 和 MoOz. Mo2C/VC 的电催化性能可能是由于其表面钝化物种(MoOxCy 和 MoOz)的氧化还原, 以及氧在 Mo2C 晶格中的迁入和迁出引起的.

关键词: 碳化钼, 氧还原, 电催化剂, 燃料电池

Abstract: Mo2C/VC was used as the oxygen reduction electrocatalyst for proton exchange membrane fuel cells. The cyclic voltammetry results showed three reversible redox peaks at 0.34, 0.45, 0.55 V, respectively. Its electrocatalytic activity for oxygen reduction was attributed to the redox of surface passivated species (MoOxCy and MoOz) and the migration of oxygen in Mo2C crystal lattice.

Key words: molybdenum carbide, oxygen reduction, electrocatalyst, fuel cell