Insights into the effects of surface/bulk defects on photocatalytic hydrogen evolution over TiO2 with exposed {001} facets

doi:10.1016/j.apcatb.2017.08.046

	Insights into the effects of surface/bulk defects on photocatalytic hydrogen evolution over TiO2 with exposed {001} facets
	Meng, M; Zhang, H; Cai, JM; Wang, YT; Wu, MQ; Tian, Y; Li, XG; Zhang, J; Zheng, LR; Jiang, Z
刊名	APPLIED CATALYSIS B-ENVIRONMENTAL
	2018
卷号	220 页码:126-136
关键词	TiO2 Defect distribution Surface/bulk {001} facets Photocatalytic hydrogen evolution
ISSN号	0926-3373
DOI	10.1016/j.apcatb.2017.08.046
文献子类	Article
英文摘要	This paper describes the effects of defect distribution on energy band structure and the subsequent photo catalytic activity over TiO2 with exposed {001} facets as the model catalyst. Our results show that only surface oxygen vacancies (V-o's) and Ti3+ centers in TiO2 can be induced by hydrogenation treatment, whereas the generation of bulk Vo's and Ti3+ species depends on the thermal treatment in nitrogen. Both the surface and bulk defects in TiO2 can promote the separation of electron-hole pairs, enhance the light absorption, and increase the donor density. The presence of surface and bulk defects in TiO2 can not change the valence band maximum, but determine the conduction band minimum. Surface defects in TiO2 induce a tail of conduction band located above the H+/H-2 redox potential, which benefits the photocatalytic performance. However, bulk defects in TiO2 generate a band tail below the H+/H-2 potential, which inhibits hydrogen production. Thus, the change of band gap structure by defects is the major factor to determine the photocatalytic activity of TiO2 for hydrogen evolution. It is a new insight into the rational design and controllable synthesis of defect-engineered materials for various catalytic processes.
电子版国际标准刊号	1873-3883
WOS关键词	ANATASE TIO2 ; TITANIUM-DIOXIDE ; PHASE-TRANSFORMATION ; BLACK TIO2 ; NANOCRYSTALS ; DISORDER ; WATER ; BULK ; NANOPARTICLES ; NANOMATERIALS
WOS研究方向	Chemistry ; Engineering
语种	英语
WOS记录号	WOS:000412957200013
内容类型	期刊论文
源URL	[http://ir.ihep.ac.cn/handle/311005/285493]
专题	高能物理研究所_多学科研究中心高能物理研究所_实验物理中心中国科学院高能物理研究所_中国散裂中子源
作者单位	中国科学院高能物理研究所
推荐引用方式 GB/T 7714	Meng, M,Zhang, H,Cai, JM,et al. Insights into the effects of surface/bulk defects on photocatalytic hydrogen evolution over TiO2 with exposed {001} facets[J]. APPLIED CATALYSIS B-ENVIRONMENTAL,2018,220:126-136.
APA	Meng, M.,Zhang, H.,Cai, JM.,Wang, YT.,Wu, MQ.,...&郑黎荣.(2018).Insights into the effects of surface/bulk defects on photocatalytic hydrogen evolution over TiO2 with exposed {001} facets.APPLIED CATALYSIS B-ENVIRONMENTAL,220,126-136.
MLA	Meng, M,et al."Insights into the effects of surface/bulk defects on photocatalytic hydrogen evolution over TiO2 with exposed {001} facets".APPLIED CATALYSIS B-ENVIRONMENTAL 220(2018):126-136.