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Fabricating Sandwich-Shelled ZnCdS/ZnO/ZnCdS Dodecahedral Cages with “One Stone” as Z-scheme Photocatalysts for Highly Efficient Hydrogen Production

Abstract

Affording two semiconductors with one template in one step to construct a composite with delicate structures may endow low-cost photocatalysts with desired characteristics, i.e., high activity, stability and recyclability, albeit challenging. Herein, novel sandwich-shelled ZnCdS/ZnO/ZnCdS cages are fabricated with “one stone”—zeolitic-imidazolate-framework-8. ZnS and ZnO are formed simultaneously in the sulfidation stage, where ZnS serves as a barrier to localize ZnO particles filling up the voids between ZnS layers. It could therefore be very advantageous in photocatalysis that the ZnCdS, derived from cation-exchanged ZnS, and ZnO with well-defined interfaces also have staggered band structure configurations by virtue of the fine adjustment of the composition. The Zn0.5Cd0.5S/ZnO/Zn0.5Cd0.5S cages exhibit a H2 production rate of 28.6 mmol g–1 h–1 and long-term durability, among the highest activities in ZnCdS and ZnO families under noble-metal-free conditions. The remarkable performance could be ascribed to the unique morphology of the sandwich-shell and hollow interior integrating multiple vital merits for photocatalysis, including the enhanced light-harvesting ability, abundant active sites, shortened charge diffusion distances, and Z-scheme mechanism featuring preserved strong redox ability and improved charge separation and migration. This facile strategy may offer great opportunities in developing highly active metal sulfide/oxide-based photocatalysts for practical applications.

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Publication details

The article was received on 30 Jul 2018, accepted on 07 Sep 2018 and first published on 10 Sep 2018


Article type: Paper
DOI: 10.1039/C8TA07362G
Citation: J. Mater. Chem. A, 2018, Accepted Manuscript
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    Fabricating Sandwich-Shelled ZnCdS/ZnO/ZnCdS Dodecahedral Cages with “One Stone” as Z-scheme Photocatalysts for Highly Efficient Hydrogen Production

    J. Chen, Z. Shen, S. Lv, K. Shen, R. Wu, X. Jiang, T. Fan, J. Chen and Y. Li, J. Mater. Chem. A, 2018, Accepted Manuscript , DOI: 10.1039/C8TA07362G

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