Layered Fe(Ⅲ) doped TiO_2 thin-film electrodes for the photoelectrocatalytic oxidation of glucose and potassium hydrogen phthalate  

作　　者：YU Hua WANG Jing ZHANG ShanQing LI XinJun ZHAO HuiJun 

机构地区：[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

出　　处：《Chinese Science Bulletin》2011年第23期2475-2480,共6页

基　　金：supported by the Australian Research Council (ARC);the Knowledge Innovation Program of the Chinese Academy of Sciences (KGCX2-YW-343)

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.Four types of TiO2 thin-film electrodes were fabricated from TiOe and Fe（Ⅲ） doped TiO2 sols using a layer-by-layer dip-coating technique. Electrodes fabricated were TF （pure TiO2 surface, Fe（III）-TiO2 bottom layer）, FT （Fe（Ⅲ）-TiO2 surface, pure TiO2 bot- tom layer）, TT （both layers pure TiO2） and FF （both layers Fe（Ⅲ）-TiO2）. The photoelectrochemical behavior of these electrodes was characterized using linear sweep voltammetry （LSV）, electrochemical impedance spectroscopy （EIS） and steady-state photo- current measurements in aqueous 0.1 mol L-I NaNO3 containing varying concentrations of glucose or potassium hydrogen phtha- late （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.

关 键 词：TiO2薄膜电极 邻苯二甲酸氢钾 葡萄糖 光电催化氧化 掺杂 线性扫描伏安法 铁 层状 

分 类 号：O643.36[理学—物理化学]