期刊
CHEMICAL ENGINEERING JOURNAL
卷 420, 期 -, 页码 -出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2020.127681
关键词
TiO2 nanosheet; Isolated cobalt atom; Charge kinetics steering; Hydrogen evolution; Photocatalysis
资金
- NSFC [21773242, 21935010]
- Strategic Priority Research Program of the Chinese Academy of Sciences [XDB20000000]
- National Key Research and Development Program of China [2018YFA0208600, 2017YFA0403400]
- NSF of Fujian province [2020J05085]
This study successfully locates isolated Co atoms on the surface of TiO2 nanosheets, providing efficient catalytic sites for photocatalytic hydrogen evolution. X-ray absorption fine structure measurements confirm that the Co atoms are successfully dispersed on the TiO2 surface via grafting. Experimental and theoretical results demonstrate that the isolated Co atoms can accelerate electron transfer and hydrogen evolution reactions through effective Co-O electronic coupling.
Precisely constructed dispersion of well-defined single-atom active centers on the semiconductor could allow of the investigation of reaction mechanisms, yet targeted delivery of solar energy to steer the charge kinetics for hydrogen evolution remains challenging. Here we realize the location of isolated Co atoms on the TiO2 nanosheets with the thickness of 6 nm, providing highly active catalytic sites for the significantly boosted photocatalytic hydrogen evolution. X-ray absorption fine structure measurements verify that the atomically dispersed Co is successfully grafted on the surface of TiO2 nanosheets. Experimental exploration and theoretical demonstration not only confirm the isolated Co atoms perform as reactive sites, but also verify that the electron transfer and hydrogen adsorption/desorption processes can be greatly accelerated via the effective Co-O electronic coupling in atomic scale, thereby facilitating the hydrogen evolution.
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