二氧化钛和三氧化二铁复合纳米晶电极的光电化学性质

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

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Fe2 O3电极呈现n型半导体的特性(阳极光电流 ) ;以不同方式经Fe2 O3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Fe2 O3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 .

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 Fe 2O 3 nanocrystalline electrode; but there was no photoresponse in Fe 2O 3 coated TiO 2 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 ) Fe 2O 3 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.