Oxygen vacancy mediated construction of anatase/brookite heterophase junctions for high-efficiency photocatalytic hydrogen evolution

CORC > 生态环境研究中心 > 中国科学院生态环境研究中心 > 中国科学院饮用水科学与技术重点实验室

	Oxygen vacancy mediated construction of anatase/brookite heterophase junctions for high-efficiency photocatalytic hydrogen evolution
	Liu, Huijuan; An, Xiaoqiang; Hu, Chengzhi; Qu, Jiuhui
刊名	JOURNAL OF MATERIALS CHEMISTRY A
	2017-12-21
卷号	5 期号:47 页码:24989-24994
英文摘要	In the past several years, the exploration of non-stoichiometric metal oxides has triggered an explosion of interest for many important applications, while the contribution of oxygen vacancy defects to the photocatalytic performance of surface heterophase junctions is still an open question. In this paper, a hydrogenation treatment method was used to fabricate defect-rich heterophase junctions. Experimental characterization indicated that the generation of oxygen vacancies not only influenced the electronic structure of TiO2 nanofibers, but also facilitated the phase transformation from anatase/rutile to anatase/brookite junctions. For improved interfacial charge separation, a novel urea-assisted strategy was further developed to achieve the subsequent rearrangement of oxygen vacancy defects. As a result, ESR and XPS measurements evidenced the diminishment of bulk defects and the preservation of surface oxygen vacancies. Anatase/brookite heterophase junctions with surface oxygen vacancies exhibited an unprecedented hydrogen production rate of 1.6 mmol h(-1), which was more than 12 times higher than that of pristine TiO2 nanofibers. Our work revealed the significant impact of oxygen vacancies on the phase and electronic structures of heterophase junctions. It also provided an effective strategy to develop highly active TiO2-based photocatalysts through integrating defect modulation and junction design.
内容类型	期刊论文
源URL	[http://ir.rcees.ac.cn/handle/311016/39721]
专题	生态环境研究中心_中国科学院饮用水科学与技术重点实验室
推荐引用方式 GB/T 7714	Liu, Huijuan,An, Xiaoqiang,Hu, Chengzhi,et al. Oxygen vacancy mediated construction of anatase/brookite heterophase junctions for high-efficiency photocatalytic hydrogen evolution[J]. JOURNAL OF MATERIALS CHEMISTRY A,2017,5(47):24989-24994.
APA	Liu, Huijuan,An, Xiaoqiang,Hu, Chengzhi,&Qu, Jiuhui.(2017).Oxygen vacancy mediated construction of anatase/brookite heterophase junctions for high-efficiency photocatalytic hydrogen evolution.JOURNAL OF MATERIALS CHEMISTRY A,5(47),24989-24994.
MLA	Liu, Huijuan,et al."Oxygen vacancy mediated construction of anatase/brookite heterophase junctions for high-efficiency photocatalytic hydrogen evolution".JOURNAL OF MATERIALS CHEMISTRY A 5.47(2017):24989-24994.