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Hollow ZnCdS Dodecahedral Cages for Highly Efficient Visible-Light-Driven Hydrogen Generation

Abstract

Hydrogen production through water splitting under visible-light irradiation is considered as an ideal process to convert solar energy into chemical energy. In this work, we report the rational design of a new kind of visible-light photocatalysts consisted of hollow ZnCdS rhombic dodecahedral cages via simple sulfurization and cation-exchange using zeolitic-imidazolate-framework-8 (ZIF-8) as the single precursor. The hollow cages and mesoporous structures can endow Zn1-xCdxS solid solutions with significantly improved visible-light utilization and charge carrier separation and transfer. In addition, BET surface areas of hollow ZnCdS cages were also significantly enhanced with the introduction of Cd as compared to that of ZnS cages, beneficial to provide abundant exposed active sites and decrease the charge transport distance. Moreover, suitable band matching and strong electron coupling in these solid solutions could be simultaneously achieved via ion-exchange, featuring the balance between light absorption ability and the potential of conduction band of the Zn1-xCdxS photocatalysts. Consequently, the hollow Zn0.6Cd0.4S cage material exhibited the highest hydrogen production rate of 5.68 mmol h-1 g-1 under cocatalyst-free and visible-light irradiation (λ > 420 nm) conditions. Furthermore, these hollow ZnCdS cages showed excellent long-term stability, maintaining high photocatalytic activity for hydrogen evolution over a number of cycles. We believe that this facile strategy for developing highly efficient ZnCdS photocatalysts from MOFs could be extended to the synthesis of other metal hollow cages for a variety of advanced applications.

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Publication details

The article was received on 28 Aug 2017, accepted on 12 Oct 2017 and first published on 13 Oct 2017


Article type: Paper
DOI: 10.1039/C7TA07587A
Citation: J. Mater. Chem. A, 2017, Accepted Manuscript
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    Hollow ZnCdS Dodecahedral Cages for Highly Efficient Visible-Light-Driven Hydrogen Generation

    J. Chen, J. Chen and Y. Li, J. Mater. Chem. A, 2017, Accepted Manuscript , DOI: 10.1039/C7TA07587A

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