物理化学学报 >> 1999, Vol. 15 >> Issue (03): 222-227.doi: 10.3866/PKU.WHXB19990306

研究论文 上一篇    下一篇

二氧化钛和三氧化二铁复合纳米晶电极的光电化学性质

王艳芹, 程虎民, 马季铭   

  1. 北京大学化学系,北京 100871
  • 收稿日期:1998-07-07 修回日期:1998-09-01 发布日期:1999-03-15
  • 通讯作者: 程虎民

The Photoelectrochemical Properties of Composite Titanium Dioxide and Ferric Oxide Nanocrystalline Electrodes

Wang Yan-qin, Cheng Hu-Min, Ma Ji-Ming   

  1. Department of Chemistry,Peking University,Beijing 100871
  • Received:1998-07-07 Revised:1998-09-01 Published:1999-03-15
  • Contact: Cheng Hu-Min

摘要:

研究了以不同方式相互修饰的Fe2 O3和TiO2 纳米晶电极的光电化学行为 (包括离子的相互掺杂 ) .在不同的入射光波长下 ,瞬态光电流谱显示Ti4+掺杂的Fe2O3电极呈现n型半导体的特性(阳极光电流) ;以不同方式经Fe2O3包覆的TiO2 电极由于能级的不匹配 ,在整个的波长测量范围内没有光响应 ;而对Fe3+离子掺杂的TiO2 电极和经TiO2 修饰 (包覆或偶联)的Fe2O3纳米晶电极则呈现出p-n共存特性 ,甚至个别的电极表现出纯粹的p型半导体的特性 .这些现象可以从p型微区的形成得到解释 .

关键词: TiO2修饰的Fe2O3纳米晶电极, Fe2O3修饰的TiO2纳米晶电极, 瞬态光电流, p-n共存特性

Abstract:

The photoelectrochemical behaviors of the mutual modified nanocrystalline Fe 2O 3 and TiO 2 electrodes prepared by different methods (including the mutual doping of metal ions) were studied. With different incident light wavelength, transient photocurrent spectra showed different characteristics. A characteristics of n-type semiconductor appeared in Ti 4+ doped Fe2O3 nanocrystalline electrode; but there was no photoresponse in Fe2O3 coated TiO2 electrodes because of the dismatch of the energy levels of Fe 2O 3 and TiO 2; a characteristics of p n response coexistence appeared in Fe 3+ doped TiO 2 electrode and TiO 2 modified (coated or coupled ) Fe2O3 nanocrystalline electrodes, even the characteristic of p type semiconductor appeared in two special electrodes. All these phenomena can be explained reasonably by the formation of the microzone of p-type semiconductor.

Key words: TiO2-modified Fe2O3 nanocrystalline electrode, Fe2O3-modefied TiO2 nanocrystalline electrode, ransient photocurrent, Characteristic of p-n coexistence