Fabricating sandwich-shelled ZnCdS/ZnO/ZnCdS dodecahedral cages with “one stone” as Z-scheme photocatalysts for highly efficient hydrogen production

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. Herein, novel sandwich-shelled ZnCdS/ZnO/ZnCdS cages are fabricated with “on...

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Veröffentlicht in:Journal of materials chemistry. A, Materials for energy and sustainability Materials for energy and sustainability, 2018, Vol.6 (40), p.19631-19642
Hauptverfasser: Chen, Jianmin, Shen, Zirong, Lv, Siming, Shen, Kui, Wu, Rongfang, Jiang, Xiao-fang, Fan, Ting, Chen, Junying, Li, Yingwei
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Sprache:eng
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Zusammenfassung: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. 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 the ZnO particles filling up the voids between the 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 Zn 0.5 Cd 0.5 S/ZnO/Zn 0.5 Cd 0.5 S cages exhibit a H 2 production rate of 28.6 mmol g −1 h −1 and long-term durability, achieving the highest activities among the ZnCdS and ZnO families under noble-metal-free conditions. This 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.
ISSN:2050-7488
2050-7496
DOI:10.1039/C8TA07362G