Electrocatalytic activity of nanocrystalline TiO2 film modified Ti electrode
- 化学化工－已发表论文 
The precursor Ti(OEt)(4) was prepared by anodic dissolution of metallic titanium in absolution ethanol 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 investigated by cyclic voltammetry and cyclic osteryoung square wave voltammetry and bulk electrolysis. The results indicated that there were two pairs of well-defined redox peaks for Ti/nano-TiO2 electrode in 1 mol/ L H2SO4 with E-pc1 = -0.56 V, E-pc2 = - 0.95 V (vs. SCE) at 100 mV/s and the heterogeneous catalytic redox behavior of this electrode in nitrobenzene (NB) in H,SO, medium. It was found that the indirect electroreduction of NB to p-aminophonol (PAP) by Ti ( IV ) /Ti ( III ) redox system occurred on nanocrystalline TiO2 film surface. In preparative electrolysis under optimal conditions, the average yield and current efficiency for PAP were 91.6% and 95.2% respectively.