TiN基IrO2-Ta2O5涂层析氢电极的催化性能

催化学报 , 2006, 27(11): 952-956.

TiN基IrO2-Ta2O5涂层析氢电极的催化性能

徐海波 ^1, , 姜俊峰 ^2, , 王廷勇 ^3, , 王佳 ^4, , 许立坤 ^5,

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;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

2.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

3.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

4.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;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

5.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

基金项目: 山东省青岛市科技发展基金(05-1-GX-07)

关键词：氮化钛 , 氧化铱 , 氧化钽 , 电催化 , 析氢反应

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

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.

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