气候变化领域集成服务门户(CCPortal): Synergistic effects of crystal structure and oxygen vacancy on Bi2O3 polymorphs: intermediates activation, photocatalytic reaction efficiency, and conversion pathway

CCPortal

DOI	10.1016/j.scib.2020.01.007
	Synergistic effects of crystal structure and oxygen vacancy on Bi2O3 polymorphs: intermediates activation, photocatalytic reaction efficiency, and conversion pathway
	Lei B.; Cui W.; Sheng J.; Wang H.; Chen P.; Li J.; Sun Y.; Dong F.
发表日期	2020
ISSN	20959273
起始页码	467
结束页码	476
卷号	65 期号:6
英文摘要	This work unraveled the synergistic effects of crystal structure and oxygen vacancy on the photocatalytic activity of Bi2O3 polymorphs at an atomic level for the first time. The artificial oxygen vacancy is introduced into α-Bi2O3 and β-Bi2O3 via a facile method to engineer the band structures and transportation of carriers and redox reaction for highly enhanced photocatalysis. After the optimization, the photocatalytic NO removal ratio on defective β-Bi2O3 was increased from 25.2% to 52.0% under visible light irradiation. On defective α-Bi2O3, the NO removal ratio is just increased from 7.3% to 20.1%. The difference in the activity enhancement is associated with the different structure of crystal phase and oxygen vacancy. The density functional theory (DFT) calculation and experimental results confirm that the oxygen vacancy in α-Bi2O3 and β-Bi2O3 could promote the activation of reactants and intermediate as active centers. The crystal structure and oxygen vacancy could synergistically regulate the electrons transfer pathway. On defective β-Bi2O3 with tunnel structure, the reactants activation and charge transfer were more efficient than that on α-Bi2O3 with zigzag-type configuration because the defect structures on the surface of α-Bi2O3 and β-Bi2O3 were different. Moreover, the in situ FT-IR revealed the mechanisms of photocatalytic NO oxidation. The photocatalytic NO conversion pathway on α-Bi2O3 and β-Bi2O3 can be tuned by the different surface defect structures. This work could provide a novel strategy to regulate the photocatalytic activity and conversion pathway via the synergistic effects of crystal structure and oxygen vacancy. © 2020 Science China Press
关键词	Crystal structure In situ FT-IR Oxygen vacancy Reaction mechanism Synergistic effect
英文关键词	Charge transfer; Chemical activation; Crystal atomic structure; Crystal structure; Defect structures; Density functional theory; Oxygen; Oxygen vacancies; Photocatalytic activity; Reaction intermediates; Redox reactions; Surface defects; Activity enhancement; Different structure; In-situ FT-IR; Photocatalytic reactions; Reaction mechanism; Synergistic effect; Tunnel structures; Visible-light irradiation; Bismuth compounds
语种	英语
来源期刊	Science Bulletin
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/207088
作者单位	Chongqing Key Laboratory of Catalysis and New Environmental Materials, College of Environment and Resources, Chongqing Technology and Business University, Chongqing, 400067, China; Research Center for Environmental Science & Technology, Institute of Fundamental and Frontier Sciences, University of Electronic Science and Technology of China, Chengdu, 611731, China; The Center of New Energy Materials and Technology, School of Materials Science and Engineering, Southwest Petroleum University, Chengdu, 610500, China; College of Architecture and Environment, Sichuan University, Chengdu, 610065, China
推荐引用方式 GB/T 7714	Lei B.,Cui W.,Sheng J.,et al. Synergistic effects of crystal structure and oxygen vacancy on Bi2O3 polymorphs: intermediates activation, photocatalytic reaction efficiency, and conversion pathway[J],2020,65(6).
APA	Lei B..,Cui W..,Sheng J..,Wang H..,Chen P..,...&Dong F..(2020).Synergistic effects of crystal structure and oxygen vacancy on Bi2O3 polymorphs: intermediates activation, photocatalytic reaction efficiency, and conversion pathway.Science Bulletin,65(6).
MLA	Lei B.,et al."Synergistic effects of crystal structure and oxygen vacancy on Bi2O3 polymorphs: intermediates activation, photocatalytic reaction efficiency, and conversion pathway".Science Bulletin 65.6(2020).