高等学校化学学报 ›› 2004, Vol. 25 ›› Issue (11): 2137-2139.

• 研究简报 • 上一篇    下一篇

纳米TiO2膜修饰电极上对硝基苯甲酸异相电催化还原

褚道葆1, 姚文俐1, 顾家山1, 李晓华1, 沈广霞2   

  1. 1. 安徽师范大学化学与材料科学学院, 芜湖241000;
    2. 厦门大学化学系, 厦门361005
  • 收稿日期:2003-08-06 出版日期:2004-11-24 发布日期:2004-11-24
  • 基金资助:

    安徽省自然科学基金(批准号:00045317);安徽省高校科研基金(批准号:2003kj131,2004kj164zd)资助

Heterogeneous Electrocatalytic Reduction of p-Nitrobenzoic Acid on Nanocrystalline TiO2 Film Modified Electrode

CHU Dao-Bao1, YAO Wen-Li1, GU Jia-Shan1, LI Xiao-Hua1, SHEN Guang-xia2   

  1. 1. College of Chemmistry and Material Science, Anhui Normal University, Wuhu 241000, China;
    2. Department of Chemistry, Xiamen University, Xiamen 361005, China
  • Received:2003-08-06 Online:2004-11-24 Published:2004-11-24

关键词: 纳米TiO2膜电极, 电催化, 循环伏安, 对硝基苯甲酸, 对氨基苯甲酸

Abstract: Redox behavior and electrocatalytic activities of the Ti/nano-TiO2 electrode were investigated by cyclic voltammetry(CV) and bulk electrolysis. The results indicate that there are two pairs of well-defined redox peaks for Ti/nano-TiO2 film electrode in the 1 mol/L H2SO4 and 1 mol/L NaOH at 0.1 V/s corresponding to TiO2/ Ti2O3 and TiO2/Ti(OH)3 reversible electrode process. In 1 mol/L NaOH medium the peak potential evidently shift to the negative value with E1/2r being -1.38 and -1.72 V(vs.SCE), and the heterogeneous electrocatalytic reduction activities of TiO2/Ti2O3 redox for p-nitrobenzoic acid (PNA) is very high. The indirect electroreduction of PNA to p-aminobenzoic acid (PAA) by Ti/Ti redox system on nanocrystalline TiO2 film surface was found, and the electrode reaction mechanism is called electro-catalytic(EC) mechanism. In the preparative electrolysis, the current efficiency was over 90%.

Key words: Nanocrystalline TiO2 film electrode, Electrocatalysis, Cyclic voltammetry, p-Nitrobenzoic acid, p-Aminobenzoic acid

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