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In situ topotactic fabrication of 2D/2D direct Z-scheme ZnO/ZnxCd1-xS single crystal nanosheet heterojunction for efficient photocatalytic water splitting

Abstract

Direct Z-scheme heterojunction is an effective construction to enhance the photocatalytic activity due to its low carrier recombination rate and high redox ability. In this work, 2D/2D ZnO/ZnxCd1-xS single crystal nanosheet heterojunction is synthesized by the in situ topotactic sulfurization/oxidization pyrolysis of Zn/Cd/Al layer double hydroxides (LDHs). Its unique structure provides not only far more intimate interfaces but also a direct Z-scheme junction. The in-situ topotactic fabrication of ZnO by oxidation process implies some Zn ions dissolves out from Zn0.67Cd0.33S solid solution nanosheets with the increase of annealing temperature and time. The longer the oxidation proceed, the more ZnO is obtained. The emergence of ZnO gives rise to the formation of 2D/2D ZnO/ZnxCd1-xS single crystal nanosheet heterojunction that increases the visible light absorption and boosts the separation of photogenerated carriers. The ZnO/ZnxCd1-xS-4 single crystal nanosheet heterojunction presents highest photocatalytic activity under visible light irradiation (38.93 mmol h-1g-1), nearly 16.93 times higher than that of Zn0.67Cd0.33S-300, and external quantum efficiency of 40.97% at λ = 420 nm. The proposed synthetic route for construction of 2D/2D ZnO/ ZnxCd1-xS single crystal nanosheet provides a direct Z-scheme structure with highly efficient photocatalytic hydrogen evolution activity.

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Publication details

The article was received on 09 Sep 2018, accepted on 04 Nov 2018 and first published on 07 Nov 2018


Article type: Paper
DOI: 10.1039/C8CY01884G
Citation: Catal. Sci. Technol., 2018, Accepted Manuscript
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    In situ topotactic fabrication of 2D/2D direct Z-scheme ZnO/ZnxCd1-xS single crystal nanosheet heterojunction for efficient photocatalytic water splitting

    J. Shi, S. Li, F. Wang, L. Gao, Y. Li, X. Zhang and J. Lu, Catal. Sci. Technol., 2018, Accepted Manuscript , DOI: 10.1039/C8CY01884G

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