物理化学学报 >> 2004, Vol. 20 >> Issue (02): 182-185.doi: 10.3866/PKU.WHXB20040215

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纳米TiO2-Pt修饰电极的制备及电催化活性

褚道葆;王凤武;魏亦军;姚文俐;李晓华   

  1. 安徽师范大学化学与材料科学学院,芜湖 241000;淮南师范学院,淮南 232001
  • 收稿日期:2003-06-05 修回日期:2003-08-26 发布日期:2004-02-15
  • 通讯作者: 褚道葆 E-mail:dbchu@sina.com

Electrocatalytic Activities and Preparation of Nanocrystalline TiO2 -Pt Modified Electrode

Chu Dao-Bao;Wang Feng-Wu;Wei Yi-Jun;Yao Wen-Li;Li Xiao-Hua   

  1. College of Chemistry and Materials Science, Anhui Normal University, Wuhu 241000; 2Huainan Teachers College, Huainan 232001
  • Received:2003-06-05 Revised:2003-08-26 Published:2004-02-15
  • Contact: Chu Dao-Bao E-mail:dbchu@sina.com

摘要: 采用电化学合成前驱体直接水解法和电沉积法制备高活性纳米TiO2-Pt修饰电极,并使用扫描电子显微镜(SEM)对电极的表面形貌和结构进行了表征; 通过循环伏安法研究了纳米TiO2-Pt修饰电极在H2SO4溶液中的电化学行为以及对Mn2+氧化为Mn3+的电催化活性. 结果表明,纳米TiO2的晶粒大小约30 nm,修饰在纳米TiO2膜表面的Pt微粒呈现单分散状态,平均粒径约60 nm,纳米TiO2-Pt修饰电极的电化学性能优于纯Pt电极,对Mn2+的电氧化具有高催化活性,非均相无隔膜电解氧化Mn2+生成Mn3+平均电流效率可达86%.

关键词: 纳米TiO2-Pt修饰电极, 电催化, Mn3+/Mn2+, 电氧化, 循环伏安

Abstract: The nanocrystalline TiO2-Pt modified titanium (Ti/nano-TiO2-Pt) electrode was prepared by electrosynthesis and direct hydrolysis and electrodeposited Pt on nanocrystalline TiO2 film. SEM was used to characterize the structure of Ti/nano-TiO2-Pt (Pt micro particle 60 nm). Redox behaviors of the Ti/nano-TiO2-Pt electrode, as well as the electrocatalytic activity of the Ti/nano-TiO2-Pt electrode for Mn2+ oxydized to Mn3+ were investigated by cyclic voltammetry and bulk electrolysis. The results indicated that there was high electrocatalytic activity of the Ti/nano-TiO2-Pt electrode for Mn2+ oxydized to Mn3+; The electrocatalytic activity of the Ti/nano-TiO2-Pt electrode was higher than Pt electrode. In preparative electrolysis under heterogeneous optimal conditions, average current efficiency for Mn3+ was 86%.

Key words: Nanocrystalline TiO2-Pt electrode, Electrocatalysis, Mn3+/Mn2+, Electrolytic oxidation, Cyclic voltammetry