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Research Article

Core–shell CdS@ZIF-8 structures for improved selectivity in photocatalytic H2 generation from formic acid

Min Zeng1,2,§, Zhigang Chai2,§, Xin Deng2, Qi Li2, Shiqiang Feng2, Juan Wang1,†( ), Dongsheng Xu2( )
College of Chemistry and Chemical EngineeringHubei UniversityWuhan430062China
College of Chemistry and Molecular EngineeringPeking UniversityBeijing100871China

§These authors contributed equally to this work.

†Present address: Key Laboratory for the Synthesis and Application of Organic Functional Molecules, Ministry of Education of China,Wuhan 430062, China

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Abstract

Encapsulating well-defined nanoparticles (NPs) into metal–organic frameworks (MOFs) to form core–shell structures not only combines their properties, but may also provide synergistic functionality. Much research attention has been focused on applying core–shell NP@MOF structures to gas storage and sensing, luminescence, lithium ion batteries, selective catalysis, and cascade reactions; however, their application as photocatalysts has been reported much more rarely. Herein, we report the design of a new core–shell structure composed of semiconductor CdS NPs as the core and ZIF-8 as the shell. Both single-core–shell and multiple-core–shell CdS@ZIF-8 were synthesized by varying the concentrations of the ZIF-8 precursor. Photocatalytic hydrogen generation from formic acid over CdS@ZIF-8 demonstrated that core–shell CdS@ZIF-8 structures exhibit increased photocatalytic selectivity for H2 generation from formic acid compared with pure CdS NPs. Furthermore, the concentration of CO in the products was significantly decreased, which benefits the application of CdS@ZIF-8 to proton-exchange membrane fuel cells. Our results provide guidance for the development of new photocatalysts based on NP@MOF core–shell materials.

Keywords

metal–organic frameworks (MOFs)cadmium sulfidecore–shellphotocatalytic H2 generationformic acidselectivity

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Nano Research
Volume 9 Issue 9,
September 2016
Pages 2729-2734
DOI: 10.1007/s12274-016-1161-3
Cite this article:
Zeng M, Chai Z, Deng X, et al. Core–shell CdS@ZIF-8 structures for improved selectivity in photocatalytic H2 generation from formic acid. Nano Research, 2016, 9(9): 2729-2734. https://doi.org/10.1007/s12274-016-1161-3

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Received: 07 April 2016
Revised: 17 May 2016
Accepted: 19 May 2016
Published: 26 July 2016
© Tsinghua University Press and Springer-Verlag Berlin Heidelberg 2016
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