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化学学报
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化学学报 ›› 2011, Vol. 69 ›› Issue (9): 1041-1046. 上一篇    下一篇

研究论文

ITO表面Pt颗粒的电化学沉积制备及其电催化氧化氨研究

邓晓辉，仵亚婷，何美凤，但承益，陈钰娟，邓意达，蒋登辉，钟澄*   

  1. (上海交通大学金属基复合材料国家重点实验室 上海 200240)
  • 投稿日期:2010-09-12 修回日期:2010-11-17 发布日期:2010-12-02
  • 通讯作者: 钟澄 E-mail:chengz@sjtu.edu.cn
  • 基金资助:

    国家自然科学基金项目;上海交通大学创新实践计划

Electrochemical Deposition of Pt Particles on Indium Tin Oxide Electrode and Their Electrocatalytic Applications in Ammonia Oxidation

DENG Xiao-Hui, WU Ya-Ting, HE Mei-Feng, DAN Cheng-Yi, CHEN Yu-Juan, DENG Yi-Da, JIANG Deng-Hui, ZHONG Cheng   

  1. (State Key Laboratory of Metal Matrix Composites, Shanghai Jiao Tong University, Shanghai 200240)
  • Received:2010-09-12 Revised:2010-11-17 Published:2010-12-02
  • Contact: Cheng ZHONG E-mail:chengz@sjtu.edu.cn

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被引次数

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以氧化铟锡(ITO)透明导电玻璃为导电基体, 采用恒电位电化学沉积方法, 在其表面制备Pt颗粒. 使用扫描电子显微镜(SEM), 能量色散X射线荧光光谱(EDS)与X射线衍射(XRD)表征了ITO表面沉积的Pt颗粒的形貌, 成分和结构. 采用循环伏安(CV)和电化学活性面积(EASA)表征Pt/ITO电极在碱性介质中对氨的电催化氧化性能及其有效电化学表面积. 结果表明, 采用电化学沉积方法, 可在ITO表面获得具有较好分散度的亚微米尺寸的Pt颗粒. 制备的Pt/ITO电极在较低Pt担载量(约0.12 mg•cm－2)的条件下, 即可获得远高于纯Pt电极的电催化氧化氨活性. 这主要归因于电化学沉积制备的Pt颗粒尺寸较小且在ITO表面呈良好分散, 具有很高的电化学活性面积.

关键词: ITO, Pt颗粒, 电化学沉积, 氨, 电催化氧化

An indium tin oxide (ITO) electrode was used as the substrate for supporting Pt particles prepared by potentiostatic electrodeposition. Scanning electron microscope (SEM), energy dispersive X-ray fluorescence spectrometry (EDS) and X-ray diffraction (XRD) analysis were employed to characterize the morphology, the composition and the structure of the deposited Pt particles. The electrocatalytic performance towards ammonia oxidation for the Pt/ITO electrode and its active surface area were investigated by the cyclic voltammetric (CV) and electrochemical active surface area (EASA) measurements. The results showed that sub-micron size Pt particles with good dispersion on ITO can be successfully obtained by electrodeposition method. The Pt/ITO electrode (with only 0.12 mg•cm－2 of Pt loading) has much better catalytic activity than that of the pure Pt electrode towards ammonia oxidation. This can be attributed to the small size and the good dispersion of the Pt particles which contribute to its high electrochemical active surface area.

Key words: indium tin oxide (ITO), Pt particles, electrochemical deposition, ammonia, electrocatalytic oxidation

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