高等学校化学学报Issue(2)：377-383,7.DOI:10.7503/cjcu20130537
电化学还原预处理对BiVO4薄膜电极光电化学氧化水性能的提高
Enhanced the Performance of Photoelectrochemical Oxidation of Water over BiVO4 Film Electrodes by Electrochemical Reduction Pretreatment
摘要
Abstract
BiVO4 thin film electrodes were pretreated by electrochemical reduction( ER) in acid aqueous so-lutions(pH=2), and its impact on the performance of photoelectrochemical oxidation of water was tested. The results show that this treatment enhances the photoelectrochemical oxidation of water over the BiVO4 thin film electrodes and the treated electrodes have a good photoelectrochemical stability. The untreated and ER treated electrode films were characterized by scanning electron microscopy, X-ray diffraction, Raman spectroscopy, X-ray photoelectron spectroscopy, UV-Vis diffuse reflectance spectroscopy, photoluminescence, electrochemi-cal impedance spectroscopy, Mott-Schottky measurements, etc. From a physical chemistry perspective, the ER pretreatment resulted an increase of the roughness of the electrode with increasing in surface area by a fac-tor of 1.4;no detectable change in crystalline but a slightly red-shift in the V-O symmetric stretching;a de-crease in binding energy for the surface Bi, V and O; partly reduction of Bi3+ with an increase in the atom ratio of Bi/V on the surface. From the view of photoelectrochemistry, due to ER treatment, the flatband poten-tial for the electrode was negatively shifted, the charge-transfer rate of photocarriers at the electrode/solution interface was accelerated while the surface recombination rate was decreased. These changes and the increased surface area are the main reasons for the enhanced photoelectrochemical performance.关键词
BiVO4/电化学还原/光电化学氧化水/预处理Key words
BiVO4/Electrochemical reduction/Photoelectrochemical oxidation of water/Pretreatment分类
化学化工引用本文复制引用
李海丽,朱红乔,曹发和,冷文华..电化学还原预处理对BiVO4薄膜电极光电化学氧化水性能的提高[J].高等学校化学学报,2014,(2):377-383,7.基金项目
国家重点基础研究发展规划项目(批准号:2011CB936003)和国家自然科学基金(批准号:50971116)资助.@@@@Supported by the National Key Basic Research and Development Program of China(No.2011CB936003) and the National Natural Science Foundation of China(No.50971116) （批准号:2011CB936003）
