光催化
材料科学
氧气
催化作用
氨生产
化学工程
纳米材料
吸附
铋
光化学
带隙
纳米技术
空位缺陷
化学
有机化学
工程类
结晶学
冶金
光电子学
作者
Xiaolan Xue,Renpeng Chen,Hongwei Chen,Yi Hu,Qingqing Ding,Ziteng Liu,Lianbo Ma,Guoyin Zhu,Wenjun Zhang,Qian Yu,Jie Liu,Jing Ma,Zhong Jin
出处
期刊:Nano Letters
[American Chemical Society]
日期:2018-10-12
卷期号:18 (11): 7372-7377
被引量:316
标识
DOI:10.1021/acs.nanolett.8b03655
摘要
The catalytic conversion of nitrogen to ammonia is one of the most important processes in nature and chemical industry. However, the traditional Haber-Bosch process of ammonia synthesis consumes substantial energy and emits a large amount of carbon dioxide. Solar-driven nitrogen fixation holds great promise for the reduction of energy consumption and environmental pollution. On the basis of both experimental results and density functional theory calculations, here we report that the oxygen vacancy engineering on ultrathin BiOBr nanosheets can greatly enhance the performance for photocatalytic nitrogen fixation. Through the addition of polymetric surfactant (polyvinylpyrrolidone, PVP) in the synthesis process, VO-BiOBr nanosheets with desirable oxygen vacancies and dominant exposed {001} facets were successfully prepared, which effectively promote the adsorption of inert nitrogen molecules at ambient condition and facilitate the separation of photoexcited electrons and holes. The oxygen defects narrow the bandgap of VO-BiOBr photocatalyst and lower the energy requirement of exciton generation. In the case of the specific surface areas are almost equal, the VO-BiOBr nanosheets display a highly improved photocatalytic ammonia production rate (54.70 μmol·g–1·h–1), which is nearly 10 times higher than that of the BiOBr nanoplates without oxygen vacancies (5.75 μmol·g–1·h–1). The oxygen vacancy engineering on semiconductive nanomaterials provides a promising way for rational design of catalysts to boost the rate of ammonia synthesis under mild conditions.
科研通智能强力驱动
Strongly Powered by AbleSci AI