Layered Fe(Ⅲ) doped TiO2 thin-film electrodes for the photoelectrocatalytic oxidation of glucose and potassium hydrogen phthalate |
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作者姓名: | YU Hua WANG Jing ZHANG ShanQing LI XinJun ZHAO HuiJun |
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作者单位: | [1]Environmental Futures Centre and Griffith School of Environment, Gold Coast Campus, Griffith University, QLD 4222, Australia [2]Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences, Guangzhou 510640, China [3]Graduate University of the Chinese Academy of Sciences, Beijing 100049, China |
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基金项目: | The work was supported by the Australian Research Council (ARC), and the Knowledge Innovation Program of the Chinese Academy of Sciences (KGCX2-YW-343). |
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摘 要: | Four types of TiO 2 thin-film electrodes were fabricated from TiO 2 and Fe(III) doped TiO 2 sols using a layer-by-layer dip-coating technique. Electrodes fabricated were TF (pure TiO 2 surface, Fe(III)-TiO 2 bottom layer), FT (Fe(III)-TiO 2 surface, pure TiO 2 bottom layer), TT (both layers pure TiO 2 ) and FF (both layers Fe(III)-TiO 2 ). The photoelectrochemical behavior of these electrodes was characterized using linear sweep voltammetry (LSV), electrochemical impedance spectroscopy (EIS) and steady-state photocurrent measurements in aqueous 0.1 mol L –1 NaNO 3 containing varying concentrations of glucose or potassium hydrogen phthalate (KHP). EIS and LSV results revealed that exciton separation efficiency followed the sequence of TF﹥TT﹥FT > FF. Under a constant potential of +0.3 V, steady-state photocurrent profiles were recorded with varying organic compound concentrations. The TF electrode possessed the greatest photocatalytic capacity for oxidizing glucose and KHP, and possessed a KHP anti-poisoning effect. Enhanced photoelectrochemical performance of the TF electrode was attributed to effective exciton separation because of the layered TF structure.
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关 键 词: | Fe(III)-doped TiO 2 charge separation efficiency photoelectrocatalysis |
收稿时间: | 25 May 2010 |
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