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Effect of trap states on photocatalytic properties of boron-doped anatase TiO2 microspheres studied by time-resolved infrared spectroscopy
Du, Yijie1,2; Wang, Zhuan1; Chen, Hailong1; Wang, Hao-Yi1; Liu, Gang3,4; Weng, Yuxiang1,2
Corresponding AuthorWang, Zhuan(zhuanwang@iphy.ac.cn) ; Weng, Yuxiang(yxweng@aphy.iphy.ac.cn)
2019-02-28
Source PublicationPHYSICAL CHEMISTRY CHEMICAL PHYSICS
ISSN1463-9076
Volume21Issue:8Pages:4349-4358
AbstractThe 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.
Funding OrganizationNational Science Foundation of China ; Ministry of Science and Technology
DOI10.1039/c8cp06109b
Indexed BySCI
Language英语
Funding ProjectNational Science Foundation of China[21633015] ; National Science Foundation of China[11721404] ; Ministry of Science and Technology[2018YFA0208701]
WOS Research AreaChemistry ; Physics
WOS SubjectChemistry, Physical ; Physics, Atomic, Molecular & Chemical
WOS IDWOS:000461722500021
PublisherROYAL SOC CHEMISTRY
Citation statistics
Cited Times:8[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/132574
Collection中国科学院金属研究所
Corresponding AuthorWang, Zhuan; Weng, Yuxiang
Affiliation1.Chinese Acad Sci, Inst Phys, Beijing Natl Lab Condensed Matter Phys, Key Lab Soft Matter Phys, Beijing 100190, Peoples R China
2.Univ Chinese Acad Sci, Sch Phys Sci, Beijing 100049, Peoples R China
3.Chinese Acad Sci, Inst Met Res, Shenyang Natl Lab Mat Sci, 72 Wenhua Rd, Shenyang 110016, Peoples R China
4.Univ Sci & Technol China, Sch Mat Sci & Engn, 72 Wenhua Rd, Shenyang 110016, Peoples R China
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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.
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