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https://hdl.handle.net/2440/126376
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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 1873-3212 |
Statement of Responsibility: | 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 |
Grant ID: | http://purl.org/au-research/grants/arc/DP150103026 http://purl.org/au-research/grants/arc/DP170104264 http://purl.org/au-research/grants/arc/LE120100026 |
Published version: | http://dx.doi.org/10.1016/j.cej.2020.124634 |
Appears in Collections: | Aurora harvest 4 Chemical Engineering publications |
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