Surface oxygen vacancy induced photocatalytic performance enhancement of a BiPO 4 nanorod

作者：Yanhui Lv, Yanfang Liu, Yanyan Zhu, Yanyan Zhu, Yongfa Zhu, Yongfa Zhu · 发表于：Journal of Materials Chemistry A · 年份：2013 · DOI：10.1039/c3ta13841k · 被引用次数：288 · 研究领域：Advanced Photocatalysis Techniques、Gas Sensing Nanomaterials and Sensors、ZnO doping and properties

A high concentration of surface oxygen vacancies were successfully introduced on the BiPO4−x nanorods via controllable hydrogen reduction. The BiPO4−x sample with surface oxygen vacancies shows a light-gray color, although the absorption sharp edge is not changed (still about 300 nm), the absorbance enhances in the range of 300–800 nm. The enhanced level of photocatalytic performance and photocurrent are both influenced by the concentration and extent of oxygen vacancies, which can be controlled by tuning hydrogen reduction temperature and time. Only high-concentration oxygen vacancies formed on the surface layers of BiPO4 can greatly improve the photocatalytic performance and photocurrent, while bulk oxygen vacancies will decrease the performance. The increasing of surface oxygen vacancies can results in broadening of the valence band width and narrowing of the bandgap, which can effect enhancement of the photoactivity and photocurrent, and extending the photoresponse wavelength range.