期刊
SOLAR RRL
卷 6, 期 11, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/solr.202200653
关键词
BiOBr; nitrogen fixation; photocatalysis; UV light; vacancies
资金
- National Natural Science Foundation of China [22002146]
- Shandong Provincial Natural Science Foundation [ZR2021QB056]
- Fundamental Research Funds for the Central Universities [202013050, 202242001]
- China Postdoctoral Science Foundation [2020M682241]
- Taishan Scholars Foundation of Shandong province [tsqn201909058]
Defect engineering is considered as a feasible approach to enhance photocatalytic activity. A controllable method for defect fabrication on BiOBr using UV light illumination is achieved. Different types of defects have different effects on photocatalytic activity, and V-Bi'''(VOVBi)-V-center dot center dot''' is a more stable type of defect.
Defect engineering has been considered as a feasible approach to improve the photocatalytic activity in nitrogen fixation. However, as the main determinants of photocatalytic properties, the type of vacancy and controllable preparation methods remain elusive. Herein, a controllable method for defect fabrication on BiOBr is achieved by ultraviolet (UV) light illumination. With extending the UV light illumination time, the type of defects is switched from oxygen vacancies to triple-vacancy associates (V-Bi'''(VOVBi)-V-center dot center dot'''). Notably, V-Bi'''(VOVBi)-V-center dot center dot''' is much more stable compared with oxygen vacancies on the surfaces of BiOBr, resulting in higher photocatalytic activity in nitrogen fixation. The reaction mechanism of photocatalytic reduction of N-2 to ammonia in different defects-modified BiOBr is also proposed along with the testing results. Herein, a controllable method to fabricate vacancies on BiOBr induced by UV light is provided, and the reaction pathways of photocatalytic fixation of N-2 on different defects-modified BiOBr are demonstrated.
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