Effect of trap states on photocatalytic properties of boron-doped anatase TiO2 microspheres studied by time-resolved infrared spectroscopy

doi:10.1039/c8cp06109b

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	Effect of trap states on photocatalytic properties of boron-doped anatase TiO2 microspheres studied by time-resolved infrared spectroscopy
	Du, Yijie 2,3; Wang, Zhuan 2; Chen, Hailong 2; Wang, Hao-Yi 2; Liu, Gang 1,4; Weng, Yuxiang 2,3
刊名	PHYSICAL CHEMISTRY CHEMICAL PHYSICS
	2019-02-28
卷号	21 期号:8 页码:4349-4358
ISSN号	1463-9076
DOI	10.1039/c8cp06109b
通讯作者	Wang, Zhuan(zhuanwang@iphy.ac.cn) ; Weng, Yuxiang(yxweng@aphy.iphy.ac.cn)
英文摘要	The features of the electronic structure of semiconductor photocatalysts are fundamental to understanding the corresponding photocatalytic process. Besides the bandgap and edges, the behavior of photogenerated charge carriers and trap states can also greatly affect the photocatalytic process but it has been less considered during the material design. A previous study (G. Liu, J. Pan, L. Yin et al., Adv. Funct. Mater., 2012, 22, 3233-3238) showed that the interstitial boron on anatase {001} facets can change the photocatalytic preference from reductive H-2 evolution to oxidative O-2 evolution in the water splitting reaction, interpreted as the change in the band edges. In this work, we employed transient infrared absorption-excitation energy scanning spectroscopy and femtosecond time-resolved mid-infrared spectroscopy to investigate this phenomenon in view of the effect caused by the boron dopant on the photogenerated carrier kinetics and the energy level distribution of the trap states. We found that the surface boron doping eliminates significantly the trap states above the valence band, which improves its photocatalytic oxygen generation. On the other hand, surface boron doping also introduces a substantial amount of electron recombination centers (i.e., B sigma+ in the shell layer). Furthermore, surface boron doping also leads to an inefficient electron transfer from TiO2 to the co-catalyst Pt. Both of these effects give rise to its inferior photocatalytic capability in H-2 evolution.
资助项目	National Science Foundation of China[21633015] ; National Science Foundation of China[11721404] ; Ministry of Science and Technology[2018YFA0208701]
WOS研究方向	Chemistry ; Physics
语种	英语
出版者	ROYAL SOC CHEMISTRY
WOS记录号	WOS:000461722500021
资助机构	National Science Foundation of China ; Ministry of Science and Technology
内容类型	期刊论文
源URL	[http://ir.imr.ac.cn/handle/321006/132573]
专题	金属研究所_中国科学院金属研究所
通讯作者	Wang, Zhuan; Weng, Yuxiang
作者单位	1.Chinese Acad Sci, Inst Met Res, Shenyang Natl Lab Mat Sci, 72 Wenhua Rd, Shenyang 110016, Peoples R China 2.Chinese Acad Sci, Inst Phys, Beijing Natl Lab Condensed Matter Phys, Key Lab Soft Matter Phys, Beijing 100190, Peoples R China 3.Univ Chinese Acad Sci, Sch Phys Sci, Beijing 100049, Peoples R China 4.Univ Sci & Technol China, Sch Mat Sci & Engn, 72 Wenhua Rd, Shenyang 110016, Peoples R China
推荐引用方式 GB/T 7714	Du, Yijie,Wang, Zhuan,Chen, Hailong,et al. Effect of trap states on photocatalytic properties of boron-doped anatase TiO2 microspheres studied by time-resolved infrared spectroscopy[J]. PHYSICAL CHEMISTRY CHEMICAL PHYSICS,2019,21(8):4349-4358.
APA	Du, Yijie,Wang, Zhuan,Chen, Hailong,Wang, Hao-Yi,Liu, Gang,&Weng, Yuxiang.(2019).Effect of trap states on photocatalytic properties of boron-doped anatase TiO2 microspheres studied by time-resolved infrared spectroscopy.PHYSICAL CHEMISTRY CHEMICAL PHYSICS,21(8),4349-4358.
MLA	Du, Yijie,et al."Effect of trap states on photocatalytic properties of boron-doped anatase TiO2 microspheres studied by time-resolved infrared spectroscopy".PHYSICAL CHEMISTRY CHEMICAL PHYSICS 21.8(2019):4349-4358.