高等学校化学学报

高等学校化学学报 ›› 2012, Vol. 33 ›› Issue (05): 1011.doi: 10.3969/j.issn.0251-0790.2012.05.026

• 物理化学 • 上一篇    下一篇

ITO上电沉积Pd的成核机理及电催化性质

汤儆1, 田晓春1, 刘跃强1, 林建航2   

  1. 1. 福州大学化学化工学院, 教育部暨福建省食品安全和分析检测重点实验室, 福州 350108;
    2. 福州大学测试中心, 福州 350002
  • 收稿日期:2011-11-03 出版日期:2012-05-10 发布日期:2012-05-10
  • 作者简介:汤 儆, 女, 博士, 副教授, 主要从事纳米电化学、 电化学微/纳米加工研究. E-mail: jingtang@fzu.edu.cn
  • 基金资助:

    国家自然科学基金(批准号: 20873112, 21073038)资助.

Nucleation Mechanism and Electrocatalysis of Pd NPs onto ITO Electrode in the Electrochemical Deposition Process

TANG Jing1, TIAN Xiao-Chun1, LIU Yue-Qiang1, LIN Jian-Hang2   

  1. 1. Key Laboratory of Analysis and Detection Technology for Food Safety, Ministry of Education and Fujian Province, College of Chemistry and Chemical Engineering, Fuzhou University, Fuzhou 350108, China;
    2. Instrumental Measurement and Analysis Center, Fuzhou University, Fuzhou 350002, China
  • Received:2011-11-03 Online:2012-05-10 Published:2012-05-10

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被引次数

6

摘要： 采用循环伏安技术和计时电流技术, 研究了ITO上电沉积Pd的过程, 发现Pd在ITO表面的电沉积是过电位成核且为不可逆的扩散控制过程; 根据Cottrell方程计算得到[PdCl4]2-的扩散系数为2.19×10-5 cm2/s; 根据Scharifker的理论模型, 归一化处理电流-时间曲线, 与理论成核曲线对照, 判断Pd 的成核机理. 通过场发射扫描电子显微镜(FESEM)对Pd 的形貌进行分析, 讨论了沉积电位和沉积时间对Pd纳米粒子形貌的影响. 用X射线粉末衍射(XRD)对Pd纳米粒子进行结构分析, 并在0.5 mol/L H2SO4溶液中研究了其电化学性质及在碱性条件下乙醇分子的电催化性质.

关键词: 氧化铟锡, 钯纳米粒子, 成核机理, 电催化

Abstract: Pd nanoparticles(NPs) electrodeposited onto indium tin oxide(ITO) surface were applied to the study of the electrocatalytic activity of ethanol. Firstly, cyclic voltammetry and chronoamperometry were employed to study the deposition mechanism at the initial stage of Pd electrodeposition on ITO. The deposition process was irreversible which was controlled by the diffusion of [PdCl4]2-, and the diffusion coefficient of[PdCl4]2- was calculated to be 2.19?10-5 cm2/s. Comparing the current transient data at different potentials with those predicted by the instantaneous and progressive nucleation models under diffusion control, progressive three-dimensional nucleation mechanism was proposed for the nucleation of Pd on ITO at -0.1 V. The mechanism changed to the instantaneous nucleation mode at -0.3 V. FESEM images of the electrodeposits show that the size of Pd NPs is affected by the deposition potential and the deposition period. Secondly, the structure of Pd NPs was analyzed with XRD and the electrochemical behavior on ITO was studied in the solution of 0.5 mol/L H2SO4, respectively. Finally, the obtained Pd NPs/ITO were applied in the electrocatalysis of 1.0 mol/L ethanol in alkaline solution, which displayed superior electrocatalytic activity.

Key words: Indium tin oxide(ITO), Pd nanoparticles(Pd NPs), Nucleation mechanism, Electrocatalysis

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