期刊
NANO ENERGY
卷 61, 期 -, 页码 54-59出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.nanoen.2019.04.029
关键词
Bi2MoO6; Photocatalytic; CO2 reduction; Ultrathin; Vacancy pairs
类别
资金
- National Natural Science Foundation of China [21676128, 21606113, 21576123]
- Singapore National Research Foundation under NRF RF Award [NRF-RF2013-08, MOE2016-T2-1-131, MOE2015-T2-2-007, Tier 1 2017-T1-001-075]
Exploring efficient strategies to increase CO2 photoreduction performance is a key challenge in the energy conversion field. Herein, a cooperative role involving an ultrathin 2D structure and surface defects is employed to design defective Bi2MoO6 ultrathin nanosheets, to boost the CO2 photoreduction activity under water with no sacrificial agent, co-catalyst or extra photosensitizer. Bi2MoO6 ultrathin nanosheets with surface Bi-O '' vacancy pairs are grown via a template-directed strategy, as proved by STEM-ADF and positron annihilation spectroscopy. The engineered Bi-O '' vacancy pairs tune the local atomic structure, electronic structure of Bi2MoO6 and serve as charge separation centers to boost the electron-hole separation. Meanwhile, the defective ultrathin structure favors the CO2 adsorption, activation and CO desorption processes. With the merits of atomically-thin configuration and surface defects, the defective Bi2MoO6 ultrathin nanosheets display 2.55 times improved CO formation rate than their bulk counterpart under light irradiation.
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