催化学报

催化学报 ›› 2006, Vol. 27 ›› Issue (11): 952-956.

• 研究论文 • 上一篇    下一篇

TiN基IrO2-Ta2O5涂层析氢电极的催化性能

徐海波1,2,姜俊峰1,王廷勇2,王佳1,3,许立坤2   

  1. 1 中国海洋大学化学化工学院海洋化学理论与工程技术教育部重点实验室, 山东青岛 266003; 2 中国船舶重工集团公司七二五研究所青岛分部海洋腐蚀与防护国防科技重点实验室, 山东青岛 266071; 3 中国科学院金属研究所金属腐蚀与防护国家重点实验室, 辽宁沈阳 110016
  • 收稿日期:2006-11-25 出版日期:2006-11-25 发布日期:2006-11-25

Electrocatalytic Properties of TiN-Based IrO2-Ta2O5 Coating Electrodes for Hydrogen Evolution Reaction

XU Haibo1,2*, JIANG Junfeng1, WANG Tingyong2, WANG Jia1,3, XU Likun2   

  1. 1 Key Laboratory of Marine Chemistry Theory and Technology, Ministry of Education, College of Chemistry and Chemical Engineering, Ocean University of China, Qingdao 266003, Shandong, China; 2 Qingdao Branch of Luoyang Ship MaterialResearch Institute, Qingdao 266071, Shandong, China; 3 State Key Laboratory for Corrosion and Protection of Metals, Institute of Metal Research, The Chinese Academy of Sciences, Shenyang 110015, Liaoning, China
  • Received:2006-11-25 Online:2006-11-25 Published:2006-11-25

PDF

891

被引次数

11

摘要： 采用热分解法制备了以离子镀TiN膜为基体的IrO2-Ta2O5涂层电极,通过循环极化曲线并结合扫描电镜、 X射线能谱和X射线衍射研究了涂层的析氢电催化性能. 结果表明,涂层呈多孔多裂纹的结构,焙烧温度对涂层的表面形貌和电催化活性影响很大. 420 ℃下焙烧的涂层具有最优的电催化活性. 涂层电极的析氢反应电极电位为-0.26 V(vs SCE), 低析氢过电位下的Tafel斜率为-0.04 V, 而在高析氢过电位下,电极表面吸附的大量氢原子改变了氧化物电极的结构,从而抑制了氧的阴极还原反应.

关键词: 氮化钛, 氧化铱, 氧化钽, 电催化, 析氢反应

Abstract: The IrO2-Ta2O5 coating electrodes were prepared by thermal decomposition and supported on TiN films synthesized by multi-arc ion plating. The electrocatalytic properties of coating cathodes for hydrogen evolution reaction (HER) were investigated by cyclic polarization combined with scanning electron microscope, energy dispersive X-ray spectroscopy, and X-ray diffraction. The results showed that there existed TiN substrates on the electrodes and the electrode calcined at 420 ℃ exhibited the best electrocatalytic activity for HER. Electrode potential for hydrogen evolution on coating electrodes was -0.26 V (vs SCE). The Tafel slope was -0.04 V in the low overpotential region of HER. The structure of oxide electrodes was changed by a multitude of hydrogen atoms adsorbed on the electrode surface in the high overpotential region of HER, which restrained the cathodic reduction reaction of oxygen. These results suggest primarily that it is feasible using TiN as support for the IrO2-Ta2O5 coating cathode.

Key words: titanium nitride, iridium oxide, tantalum oxide, electrocatalysis, hydrogen evolution reaction