Journal
RENEWABLE ENERGY
Volume 168, Issue -, Pages 1112-1121Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.renene.2020.12.102
Keywords
Photocatalyst; CdS nanorod; alpha-NiS-beta-NiS; Photocatalytic hydrogen evolution; Metal organic frameworks
Funding
- Guangxi Natural Science Foundation [2017GXNSFBA198186 2018GXNSFAA281290, 2018GXNSFAA294062]
- National Natural Science Foundation of China [51768002]
- China Postdoctoral Science Foundation [2018M633295]
- Young Teachers Innovation Cultivation Program From Guangxi Bossco Environmental Protection Technology Co., Ltd. [BRP180261]
- Open Fund of Guangxi Key Laboratory of Clean Pulp & Papermaking and Pollution Control [2019KF19]
- Guangxi science and technology plan project [AD17195058]
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Utilizing MOF as the charge transfer mode converter, in combination with CdS and α-NiS-β-NiS, led to high photocatalytic hydrogen evolution activity under simulated sunlight. NH2-UiO-66/CdS/α-NiS-β-NiS exhibited the highest hydrogen production rate and significant apparent quantum efficiency.
Developing favorable charge transfer mode for photocatalytic hydrogen evolution in a photocatalyst is a promising way to enhance photocatalytic activity. In this study, MOF, decorated with different functional groups, was initially used as charge transfer mode convertor coupled with CdS/alpha-NiS-beta-NiS. The NH2-UiO-66/CdS/alpha-NiS-beta-NiS lead to twice and triple higher H-2 evolution compared to (OH)(2)-UiO-66/CdS/alpha-NiS-beta-NiS and UiO-66/CdS/alpha-NiS-beta-NiS respectively under simulated sunlight. The NH2-UiO-66 provides suitable energy band structure to formed Z-scheme with CdS/alpha-NiS-beta-NiS, which plays a synergistic role in the photocatalytic process. The loading of alpha-NiS-beta-NiS significantly improves the visible light absorption ability and provides abundant active sites. As a result, the alpha-NiS-beta-NiS/CdS/NH2-UiO-66 show considerable photocatalytic hydrogen production rate of 17.88 mmol h(-1) g(-1), which is 7.9 times and 2.5 times as high as-those of pure CdS and 7-alpha-NiS-beta-NiS/CdS, and it also shows a prominent apparent quantum efficiency (AQE) of 14.7% at 420 nm. This work provides a new insight design a metal organic frameworks based heterojunction with highly-efficient photo-induced charge separation and excellent visible-light absorption ability. (c) 2020 Elsevier Ltd. All rights reserved.
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