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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; Wang, Zhuan; Chen, Hailong; Wang, Hao-Yi; Liu, Gang; Weng, Yuxiang | |
| 2019-02-28 | |
| Source Publication | PHYSICAL CHEMISTRY CHEMICAL PHYSICS
 |
| ISSN | 1463-9076 |
| Volume | 21Issue:8Pages:4349-4358 |
| Abstract | 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. |
| Indexed By | SCI |
| Language | 英语 |
| WOS ID | WOS:000461722500021 |
| Publisher | ROYAL SOC CHEMISTRY |
| Citation statistics | |
| Document Type | 期刊论文 |
| Identifier | http://ir.imr.ac.cn/handle/321006/81356 |
| Collection | 中国科学院金属研究所 |
| Recommended Citation 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. |
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