电化学表面处理和Ti掺杂制备高光电化学性能的Fe2O3光阳极

Synthesis of Fe2O3 photoanode with improved photoelectrochemical performance by surface electrochemical pretreatment and Ti-doping

摘要:

通过金属有机物分解的方法合成了Ti掺杂Fe2O3光阳极。通过XRD、紫外—可见吸收光谱、X射线光电子能谱(XPS)、扫描电镜(SEM)对Fe2O3光阳极进行表征，并对Fe2O3光阳极进行了光电化学表征。为了提高Ti掺杂Fe2O3光阳极的光电性能，对Ti掺杂Fe2O3光阳极的Ti掺杂浓度进行了优化。光电化学测试结果表明电化学表面处理能够提高Ti掺杂Fe2O3光阳极的光电化学性能。说明Ti掺杂和电化学表面处理可以增加Fe2O3光阳极光电流。并基于Mott–Schottky曲线和电化学阻抗谱(EIS)分析了Fe2O3光阳极光电流增加的机理。

Abstract:

Ti-doped Fe2O3 photoanode was obtained through metal–organic decomposition method. The physical and photophysical properties of the hematite photoanode were investigated by X-ray diffraction (XRD), UV-vis absorption spectroscopy, X-ray photoelectron spectroscopy (XPS) and scanning electron microscopy (SEM) and the photo-electrochemical performance was evaluated for the Ti-doped Fe2O3 photoanode. In terms of maximizing the photoelectrochemical performances of the Ti-doped Fe2O3 photoanodes, the doping concentration of titanium was optimized. The Ti-doped Fe2O3 photoanode exhibits improved photoelectrochemical performance after the electrochemical surface pretreatment. The photoelctrochemical response of hematite photoanode can be improved by both titanium doping and the electrochemical surface pretreatment. Based on the analysis of the Mott–Schottky plots and electrochemical impedance spectra (EIS), a possible mechanism was proposed to explain the reason for the enhancement of photocurrent.