物理化学学报 >> 2006, Vol. 22 >> Issue (08): 1010-1014.doi: 10.3866/PKU.WHXB20060820

研究论文 上一篇    下一篇

烧结工艺对Ti/IrO2电极在酸性溶液中的电催化活性的影响

胡吉明;侯艳远;王晓梅;张鉴清;曹楚南   

  1. 浙江大学化学系杭州 310027; 中国科学院金属研究所腐蚀与防护国家重点实验室, 沈阳 110016
  • 收稿日期:2006-01-24 修回日期:2006-04-23 发布日期:2006-08-04
  • 通讯作者: 胡吉明 E-mail:kejmhu@zju.edu.cn

Effect of Calcination Procedure on the Electrocatalytic Activities of Ti/IrO2 Electrodes in Acidic Aqueous Solution

HU Ji-Ming;HOU Yan-Yuan;WANG Xiao-Mei;ZHANG Jian-Qing;CAO Chun-Nan   

  1. Department of Chemistry, Zhejiang University, Hangzhou 310027, P. R. China; State Key Laboratory for Corrosion and Protection, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, P. R. China
  • Received:2006-01-24 Revised:2006-04-23 Published:2006-08-04
  • Contact: HU Ji-Ming E-mail:kejmhu@zju.edu.cn

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摘要： 采用循环伏安(CV)与极化曲线测试了几种不同烧结工艺制备所得Ti/IrO2电极在酸性Na2SO4溶液中的电催化活性. 对传统单一高温(500 ℃)烧结与改进的分段烧结及程序升温工艺进行了比较; 扫描电镜(SEM)、X射线衍射(XRD)、电化学阻抗谱(EIS)测试表明, 传统工艺所得电极裂纹形貌不明显, 晶粒尺寸及电极的物理电阻均较大, 电化学活性较低; 改进工艺则可明显降低Ti基体的氧化, 提高电极的导电性, 其中程序升温还可使电极表面的裂纹增多, 但若该工艺的起始温度较高, 电极的表观活性下降.

关键词: Ti/IrO2电极, 热分解, 烧结工艺, 电催化活性

Abstract: The influence of the calcination procedure on electrocatalytic properties for oxygen evolution at Ti/IrO2 electrodes was investigated by using cyclic voltammetry (CV) and anodic polarization tests. Thermal decomposition at single temperature of 500 ℃ for each layer (conventional method) was adopted as the standard procedure. Scanning electron microscopy (SEM), X-ray diffraction (XRD) and electrochemical impedance spectroscopy (EIS) show the standard procedure leads to compact oxide coatings, with large grain distributing on coatings and high resistance of obtained electrodes. Both applying the lower temperatures in first three under-layers (step-method) and the programming heating in each layer can, to some extent, overcome the disadvantages of the conventional procedure, and thereby improve the electrochemical activities of electrodes. By using the modified procedures, the electrode resistance is found to decrease due to the inhibition of substrate oxidation. When using the controlled programming calcination (heating rate), the coating becomes more porous and rugged.

Key words: Ti/IrO2electrode, Thermal decomposition, Salcination procedure, Electrocatalyticactivities