标题：Oxygen vacancy-rich BiO2-x ultra-thin nanosheet for efficient full-spectrum responsive photocatalytic oxygen evolution from water splitting
作者：Sun, Benteng ;Qian, Yeye ;Liang, Zhangqian ;Guo, Yichen ;Xue, Yanjun ;Tian, Jian ;Cui, Hongzhi
作者机构：[Sun, Benteng ;Qian, Yeye ;Liang, Zhangqian ;Guo, Yichen ;Xue, Yanjun ;Tian, Jian ;Cui, Hongzhi ] School of Materials Science and Engineering, Shandon 更多
来源：Solar Energy Materials and Solar Cells
摘要：Photocatalytic water splitting is an environmentally friendly technique for oxygen evolution. Vacancy-rich layered materials with good electromigration properties are of great interests. Herein, we synthesized full-spectrum responsive vacancy-rich BiO2-x ultra-thin nanosheets (UTNSs). The band gap is narrowed and the edge of valence band is increased in the BiO2-x UTNSs, which are responsible for the enhanced light response and are confirmed by UV–Vis–NIR diffuse reflectance spectra (DRS), electronic spin resonance (ESR), X-ray photoelectron spectroscopy (XPS) and valence measurement. Compared to Bi2O3 nanosheets (NSs), BiO2-x UTNSs exhibits enhanced photocatalytic performance for oxygen evolution under full-spectrum irradiation, which can be attributed to the oxygen vacancies. The presence of oxygen vacancies in BiO2-x UTNSs promote the oxidation ability. This finding provides defect level understanding for developing highly efficient full-spectrum light responsive photocatalysts.
© 2019 Elsevier B.V.