物理化学学报 >> 2009, Vol. 25 >> Issue (07): 1434-1438.doi: 10.3866/PKU.WHXB20090751

研究论文 上一篇    下一篇

乙二醛在Ti/纳米TiO2-Pt修饰电极上的电催化氧化

褚道葆, 何建国, 侯源源, 徐迈, 王树西, 王建, 查龙武, 张雪娇   

  1. 安徽师范大学化学与材料科学学院, 安徽省功能性分子固体重点实验室, 分子基材料重点实验室, 安徽 芜湖 241000
  • 收稿日期:2009-01-18 修回日期:2009-03-09 发布日期:2009-06-26
  • 通讯作者: 褚道葆 E-mail:dbchu@sina.com

Electrocatalytic Oxidation of Glyoxal on Ti/NanoTiO2-Pt Modified Electrode

CHU Dao-Bao, HE Jian-Guo, HOU Yuan-Yuan, XU Mai, WANG Shu-Xi, WANG Jian, ZHA Long-Wu, ZHANG Xue-Jiao   

  1. Key Laboratory of Molecular Based Materials, Anhui Key Laboratory of Functional Molecular Solids, College of Chemistry and Materials Science, Anhui Normal University, Wuhu 241000, Anhui Province, P. R. China
  • Received:2009-01-18 Revised:2009-03-09 Published:2009-06-26
  • Contact: CHU Dao-Bao E-mail:dbchu@sina.com

摘要:

采用溶胶-凝胶和电沉积法制备Ti基纳米TiO2-Pt(Ti/纳米TiO2-Pt)修饰电极. X射线衍射(XRD)表明纳米TiO2为锐钛矿型, 扫描电镜(SEM)显示Pt纳米粒子在纳米TiO2多孔膜的表面呈现簇分散状态, 平均粒径约25 nm. 通过循环伏安(CV)和计时电流法研究了Ti/纳米TiO2-Pt修饰电极对乙二醛直接电氧化的电催化活性, 结果表明, 修饰电极对乙二醛的直接电氧化呈现良好的催化活性, 在0.60和1.23 V(vs SCE)出现两个氧化峰, 二者电流密度分别为16 和42 mA·cm-2, 约为纯Pt电极的2倍和1.5倍, 反应过程受浓差扩散控制.

关键词: 电催化, Ti/纳米TiO2-Pt修饰电极, 直接氧化, 乙二醛, 乙醛酸

Abstract:

A nano-TiO2 film electrode loaded with Pt nanoparticles (Ti/nanoTiO2-Pt) was prepared by a sol-gel method and electrochemical deposition technique. The formation of an anatase phase of TiO2 was confirmed by X-ray diffraction (XRD). Scanning electron microscopy (SEM) images showed that cluster scattered state Pt particles were distributed on the surface of the multi-nanoporous TiO2 film and the average particle size of Pt particles was about 25 nm. The electrocatalytic oxidation of glyoxal on the Ti/nanoTiO2-Pt modified electrode was investigated by cyclic voltammetry (CV) and chronoamperometry. The results showed that the Ti/nanoTiO2-Pt modified electrode exhibited significant electrocatalytic activity for the oxidation of glyoxal. The oxidation peak potentials were 0.60 and 1.23 V (vs SCE (saturated calomel electrode)). Current densities were 16 and 42 mA·cm-2, respectively, and they were about 2 and 1.5 times as high as those of a pure Pt electrode. The reaction process was controlled by concentration diffusion.

Key words: Electrocatalysis, Ti/nanoTiO2-Pt modified electrode, Direct oxidation, Glyoxal, Glyoxylic acid

MSC2000: 

  • O646