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纳米TiO2-Pt修饰电极的制备及电催化活性

Electrocatalytic Activities and Pr eparation of Nanocrystalline TiO2-Pt Modified Electrode

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【作者】 褚道葆王凤武魏亦军姚文俐李晓华

【Author】 Chu Dao-Bao 1 Wang Feng-Wu 1,2 Wei Yi-Jun 2 Yao Wen-Li 1 Li Xiao-Hua 1 ( 1 College of Chemistry and Materials Science,Anhui Normal University,Wu hu 241000;2 Huainan Teachers College,Huainan 232001)

【机构】 安徽师范大学化学与材料科学学院淮南师范学院安徽师范大学化学与材料科学学院 芜湖241000芜湖241000淮南232001芜湖241000

【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30nm,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60nm,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%.

【Abstract】 s The nanocrystalline TiO 2 -Pt modified titanium(Ti /nano-TiO 2 -Pt )electrode was prepared by elec-trosynthesis and direct hydrolysis and electrodeposited Pt on nanocrystalline TiO 2 film.SEM was used to character-ize the structure of Ti /nano-TiO 2 -Pt (Pt micro particle 60nm).Redox behaviors of the Ti /nano-TiO 2 -Pt elec-trode,as well as the electrocatalyt ic activity of the Ti /nano-TiO 2 -Pt electrode for Mn 2+ oxydized to Mn 3+ were in-vestigated by cyclic voltammetry an d bulk electrolysis.The results indicated that there was high electrocatalytic ac-tivity of the Ti /nano-TiO 2 -Pt electrode for Mn 2+ oxydized to Mn 3+ ;The electrocatalytic activity of t he Ti /nano-TiO 2 -Pt electrode was higher than Pt elec trode.In preparative electrolysis under heterogeneous optimal condi-tions,average current efficiency f or Mn 3+ was 86%.

【基金】 安徽省自然科学基金(00045317)资助项目~~
  • 【文献出处】 物理化学学报 ,Acta Physico-chimica Sinica , 编辑部邮箱 ,2004年02期
  • 【分类号】O646.5
  • 【被引频次】48
  • 【下载频次】396
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