高等学校化学学报

高等学校化学学报 ›› 2002, Vol. 23 ›› Issue (4): 678.

• 研究论文 • 上一篇    下一篇

Ti表面修饰纳米TiO2膜电极的电催化活性

褚道葆1, 沈广霞1, 周幸福1, 林昌健2, 林华水2   

  1. 1. 安徽师范大学有机化学研究所, 芜湖 241000;
    2. 厦门大学材料科学系, 固体表面物理化学国家重点实验室, 厦门 361005
  • 收稿日期:2000-06-16 出版日期:2002-04-24 发布日期:2002-04-24
  • 通讯作者: 褚道葆(1950年出生),男,研究员,从事电化学与纳米材料研究.
  • 基金资助:

    国家自然科学基金(批准号:29873039);安徽省自然科学基金(批准号:00045317,00046112)资助.

Electrocatalytic Activity of Nanocrystalline TiO2 Film Modified Ti Electrode

CHU Dao-Bao1, SHEN Guang-Xia1, ZHOU Xing-Fu1, LIN Chang-Jian2, LIN Hua-Shui2   

  1. 1. Institute of Organic Chemistry, Anhui Normal University, Wuhu 241000, China;
    2. Darpartment of Material Science, State Key Laboratory for Physical Chemistry of Solid Surface, Xiamen University, Xiamen 361005, China
  • Received:2000-06-16 Online:2002-04-24 Published:2002-04-24

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摘要： 用电化学合成法在Ti表面修饰一层纳米TiO2膜,TEM和XRD测试表明晶型为锐钛矿型,晶粒平均尺寸为25nm.用循环伏安法、循环方波伏安法和电解合成法研究了纳米TiO2膜电极在硫酸介质中的氧化还原行为以及对硝基苯还原的电催化活性。结果表明,纳米TiO2膜电极具有异相氧化还原催化行为,膜中的Ti(Ⅳ)/Ti(Ⅲ)作为媒质间接电还原硝基苯为对氨基苯酚,收率和电流效率分别达91.6%和95.2%.

关键词: 纳米TiO2膜电极, 电催化, 循环伏安, 硝基苯, 对氨基苯酚

Abstract: The precursor Ti(OEt)4 was prepared by anodic dissolution of metallic titanium in absolutionethanol and directly hydrolyzed to prepare nanocrystalline TiO2 film on titanium electrode (Ti/nano-TiO2)by a sol-gel process.TEM and XRD were used to characterize the structure of nanocrystalline TiO2 film(Anatase, 25 nm).Redox behavior and electrocatalytic activities of the Ti/nano-TiO2 electrode were in-vestigated by cyclic voltammetry and cyclic osteryoung square wave voltammetry and bulk electrolysis.Theresults indicated that there were two pairs of well-defined redox peaks for Ti/nano-TiO2 electrode in 1mol/L H2SO4, with Epc1= -0.56 V, Epc2= -0.95 V(vs.SCE) at 100 mV/s and the heterogeneous catalyticredox behavior of this electrode in nitrobenzene(NB) in H2SO4 medium.It was found that the indirect elec-troreduction of NBto p-aminophenol(PAP) by Ti(Ⅳ)/Ti(Ⅲ) redox system occurred on nanocrystallineTiO2 film surface.In preparative electrolysis under optimal conditions, the average yield and current effi-ciency for PAPwere 91.6% and 95.2% respectively.

Key words: Nanocrystalline TiO2 film electrode, Electrocatalysis, Cyclic votalmmetry, Nitrobenzene, p-Aminophenol

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