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Facilitating charge transfer of ZnMoS4/CuS p-n heterojunction through ZnO intercalation for efficient photocatalytic hydrogen generation

Abstract

Photocatalyst p-n junction heterostructure has demonstrated its ability to enhance separation of photo-generated charge carriers and promote its lifetimes for photocatalytic hydrogen evolution. However, few reported studies have extended into the optimization of the charge carrier dynamics to facilitate favorable kinetics of the targeted surface reaction for photocatalysis. Herein, a novel ternary chalcogenide photocatalyst ZnMoS4 is developed with ideal multi-heterojunctions of ZnMoS4/ZnO/CuS band structure. Beside synergistically enhances charge carrier separation, more importantly, the intercalated ZnO layer between ZnMoS4/CuS p-n heterojunction induces interfacial band bending that consequently allows kinetically desirable electron migration from ZnMoS4 across the multi-junction heterostructures, towards the photocatalyst surface for efficient water reduction reaction. This optimized electron dynamic configuration results in a 97% higher hydrogen evolution rate as compared to a typical unoptimized ZnMoS4/CuS p-n heterostructure. Essentially, this work offers a band structure engineering strategy for heterostructured photocatalyst design which enables efficient charge carrier dynamics and electrochemical reactivity.

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Publication details

The article was received on 26 Mar 2018, accepted on 14 May 2018 and first published on 16 May 2018


Article type: Paper
DOI: 10.1039/C8TA02763C
Citation: J. Mater. Chem. A, 2018, Accepted Manuscript
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    Facilitating charge transfer of ZnMoS4/CuS p-n heterojunction through ZnO intercalation for efficient photocatalytic hydrogen generation

    W. Y. Lim, H. Wu, Y. Lim and G. W. W. Ho, J. Mater. Chem. A, 2018, Accepted Manuscript , DOI: 10.1039/C8TA02763C

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