Electrocatalytic Activity of Nanocrystalline TiO2 Film Modified Ti Electrode

Abstract

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 E_pc1= -0.56 V, E_pc2= -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

CLC Number:

O646

TrendMD:

CHU Dao-Bao, SHEN Guang-Xia, ZHOU Xing-Fu, LIN Chang-Jian, LIN Hua-Shui. Electrocatalytic Activity of Nanocrystalline TiO₂ Film Modified Ti Electrode[J]. Chem. J. Chinese Universities, 2002, 23(4): 678.

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Electrocatalytic Activity of Nanocrystalline TiO₂ Film Modified Ti Electrode

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