| Two Photoelectrochemical Processes for TiO2 Electrode under UV Illumination |
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| 引用本文： | 崔晓莉 任达森 沃松涛 沈杰 杨锡良 章壮健. Two Photoelectrochemical Processes for TiO2 Electrode under UV Illumination[J]. 中国化学, 2003, 21(8): 1001-1004. DOI: 10.1002/cjoc.20030210805 |
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| 作者姓名： | 崔晓莉 任达森 沃松涛 沈杰 杨锡良 章壮健 |
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| 作者单位： | DepartmentofMaterialsScience,FudanUniversity,Shanghai200433,China |
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| 基金项目： | theNationalNaturalScienceFoundationofChina (Nos .2 0 0 73 0 11and 2 0 2 73 0 18)，ChinaPostdoctoralScienceFoundation |
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| 摘 要： | TiO2 thin film electrode was prepared by a sol-gel method on ITO substrates. Cyclic voltammetric behavior of the ITO/TiO2 electrode under ultraviolet (UV) illumination was investigated in the solution of Na2SO4.There are two photoelectrochemical processes for TiO2 electrode under UV illumination.One is a fast process,which results in the appearance of anodic photocurrent.The anodic photocurrent will appear and disappear with the light on and off.The other is a slow process,which will be responsible for the appearance of an oxidative peak. When the electrode is illuminated under UV light for a long time,a new oxidative peak can be observed.The peak current increases with the increase of UV illumination time.It is assumed that the new peak belongs to the oxidation of Ti^3 ,which formed and accumulated on the electrode surface during the UV illumination.A detailed mechanism is proposed on the base of these two photoelectrochemical processes.It is assumed that the change of hydrophilicity of TiO2 thin film may be related to the slow process while the film irradiated by UV light.
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| 关 键 词： | 光电化学 TiO2电极 紫外光照射 循环伏安法 亲水性 氧化钛 溶胶-凝胶法 硫酸钠溶液 |
Two Photoelectrochemical Processes for TiO_2 Electrode under UV Illumination |
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| Cui,Xtao‐Li,Ren, Da‐Sen,Wo, Song‐Tao,Shen, Jie,Yang, Xi‐Liang,Zhang, Zhuang‐Jian. Two Photoelectrochemical Processes for TiO_2 Electrode under UV Illumination[J]. Chinese Journal of Chemistry, 2003, 21(8): 1001-1004. DOI: 10.1002/cjoc.20030210805 |
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| Authors: | Cui Xtao‐Li Ren Da‐Sen Wo Song‐Tao Shen Jie Yang Xi‐Liang Zhang Zhuang‐Jian |
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| Abstract: | TiO 2 thin film electrode was prepared by a sol gel method on ITO substrates. Cyclic voltammetric behavior of the ITO/TiO 2 electrode under ultraviolet (UV) illumination was investigated in the solution of Na 2SO 4. There are two photoelectrochemical processes for TiO 2 electrode under UV illumination. One is a fast process, which results in the appearance of anodic photocurrent. The anodic photocurrent will appear and disappear with the light on and off. The other is a slow process, which will be responsible for the appearance of an oxidative peak. When the electrode is illuminated under UV light for a long time, a new oxidative peak can be observed. The peak current increases with the increase of UV illumination time. It is assumed that the new peak belongs to the oxidation of Ti 3+ , which formed and accumulated on the electrode surface during the UV illumination. A detailed mechanism is proposed on the base of these two photoelectrochemical processes. It is assumed that the change of hydrophilicity of TiO 2 thin film may be related to the slow process while the film irradiated by UV light. |
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| Keywords: | TiO_2 electrode UV illumination cyclic voltammetry hydrophilicity |
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