Synergy of NiO quantum dots and temperature on enhanced photocatalytic and thermophoto hydrogen evolution
Date
2020
Authors
Li, X.
Zhang, H.
Liu, Y.
Duan, X.
Xu, X.
Liu, S.
Sun, H.
Wang, S.
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Advisors
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Journal article
Citation
Chemical Engineering Journal, 2020; 390:124634-1-124634-9
Statement of Responsibility
Xiaojie Lia, Huayang Zhang, Yazi Liu, Xiaoguang Duan, Xinyuan Xu, Shaomin Liu,Hongqi Sun, Shaobin Wang
Conference Name
Abstract
Solar-to-hydrogen holds a great sustainable energy solution, in which photocatalysis plays an important role. In this study, a composite photocatalyst with NiO quantum dots (NiO QDs) in graphitic carbon nitride (g-CN) was synthesized and evaluated in photocatalytic (PC) and thermophotocatalytic hydrogen evolution reaction (HER) under visible light. A sample of 9 wt% NiO QDs-g-CN achieved the highest PC-HER rate of 130 μmol·g−1·h−1 at ambient condition, 11 times higher than pristine g-CN. Meanwhile the thermophotocatalytic HER rate reached 260.2 μmol·g−1·h−1 at 55 °C. Photo-illumination led to the formation of CO bond between g-CN and NiO QDs to bridge photoelectron transport for low HER overpotential barriers and enhanced electrical conductivity. The higher thermophoto-induced HER can be ascribed to the increased electrical conductivity of NiO QDs-g-CN. This work underlines the importance of chemical binding in hetero-structures and quantum confinement effects in QDs-based composites, and it also demonstrates the thermal sensitivity effect in thermophotocatalytic HER process.
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© 2020 Elsevier B.V. All rights reserved.