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Citation: CHU Dao-Bao, YAO Wen-Li, WANG Jin-Ping, GU Jia-Shan, LI Xiao-Hua, SHEN Guang-Xia. Heterogeneous Electrocatalytic Reduction of o-Nitrophenol on Nano-TiO₂ Film Modified Ti Electrode[J]. Chinese Journal of Applied Chemistry, ;2004, 21(10): 1006-1010. shu

Heterogeneous Electrocatalytic Reduction of o-Nitrophenol on Nano-TiO₂ Film Modified Ti Electrode

1.
a College of Chemistryand Materials Science, Anhui Normal University, Wuhu 241000;
2.
b Department of Chemistry, Xiamen University, Xiamen

Corresponding author: CHU Dao-Bao,
Received Date: 31 October 2003
Available Online: 18 March 2004
Fund Project: 安徽省自然科学基金(00045317) (00045317)

The precursor Ti(OEt)₄ prepared by anodic dissolution of metallic titanium in absolute ethanol was directly hydrolyzed by a sol-gel process to give nano-TiO₂ film on a titanium electrode(Ti/nano-TiO₂). Redox behavior and electrocatalytic activity of the Ti/nano-TiO₂ electrode was investigated by cyclic voltammetry, potential step chronoampermetry, and bulk electrolysis. The results indicated that there were two pairs of well defined redox peaks for Ti/nano-TiO₂ film electrode in the 1 mol/L H₂SO₄ in correspondence with TiO₂/Ti₂O₃ and TiO₂/Ti(OH)₃ reversible electrode processes with E_1/2^r being -0.56 V and -0.96 V(vs.SCE), respectively, at 0.1 V/s. Ti/nano-TiO₂ electrode showed a high heterogeneous electrocatalytic activitiy in acidic medium in reduction of o-nitrophenol. The indirect electroreduction of o-nitrophenol to o-aminophenol by Ti^Ⅳ/Ti^Ⅲ redox pair on nano TiO₂ film surface is believed to follow chemical catalysis mechanism(EC'). In preparative electrolysis at 50℃ on Ti/nano-TiO₂ electrode the current efficiency for o-aminophenol was over 90%.
- nano-TiO₂ film electrode,
- electrocatalysis,
- cyclic voltammetry,
- o-nitrophenol,
- o-aminophenol
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Heterogeneous Electrocatalytic Reduction of o-Nitrophenol on Nano-TiO₂ Film Modified Ti Electrode