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Enhanced Photoexcited Carrier Separation in Oxygen‐Doped ZnIn 2 S 4 Nanosheets for Hydrogen Evolution
Author(s) -
Yang Wenlong,
Zhang Lei,
Xie Junfeng,
Zhang Xiaodong,
Liu Qinghua,
Yao Tao,
Wei Shiqiang,
Zhang Qun,
Xie Yi
Publication year - 2016
Publication title -
angewandte chemie international edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 1433-7851
DOI - 10.1002/anie.201602543
Subject(s) - photocatalysis , doping , oxygen , materials science , charge carrier , hydrogen , photochemistry , ultrafast laser spectroscopy , semiconductor , chemical engineering , spectroscopy , nanotechnology , optoelectronics , chemistry , catalysis , organic chemistry , physics , quantum mechanics , engineering
Limited by the relatively sluggish charge‐carrier separation in semiconductors, the photocatalytic performance is still far below what is expected. Herein, a model of ZnIn 2 S 4 (ZIS) nanosheets with oxygen doping is put forward to obtain in‐depth understanding of the role that doping atoms play in photocatalysis. It shows enhanced photocatalytic activity compared with pristine ZIS. The electron dynamics analyzed by ultrafast transient absorption spectroscopy reveals that the average recovery lifetime of photoexcited electrons is increased by 1.53 times upon oxygen incorporation into the ZIS crystals, indicating enhanced separation of photoexcited carriers in oxygen‐doped ZIS nanosheets. As expected, the oxygen‐doped ZIS nanosheets show a remarkably improved photocatalytic activity with a hydrogen evolution rate of up to 2120 μmol h −1 g −1 under visible‐light irradiation, which is 4.5 times higher than that of the pristine ZIS nanosheets.