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Type: Journal article
Title: Synergy of NiO quantum dots and temperature on enhanced photocatalytic and thermophoto hydrogen evolution
Author: Li, X.
Zhang, H.
Liu, Y.
Duan, X.
Xu, X.
Liu, S.
Sun, H.
Wang, S.
Citation: Chemical Engineering Journal, 2020; 390:124634-1-124634-9
Publisher: Elsevier
Issue Date: 2020
ISSN: 1385-8947
Statement of
Xiaojie Lia, Huayang Zhang, Yazi Liu, Xiaoguang Duan, Xinyuan Xu, Shaomin Liu,Hongqi Sun, Shaobin Wang
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.
Keywords: Quantum dots; graphitic carbon nitride; photocatalysis; thermophotolysis; hydrogen production
Rights: © 2020 Elsevier B.V. All rights reserved.
DOI: 10.1016/j.cej.2020.124634
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Chemical Engineering publications

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