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Highly efficient H2 evolution over ZnO-ZnS-CdS heterostructures from an aqueous solution containing SO32- and S2- ions

Published online by Cambridge University Press:  31 January 2011

Xuewen Wang ,
Gang Liu ,
Zhi-Gang Chen ,
Feng Li ,
Gao Qing Lu  and
Hui-Ming Cheng
Feng Li
Affiliation:
Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, People’s Republic of China
Gao Qing Lu*
Affiliation:
ARC Centre of Excellence for Functional Nanomaterials, School of Engineering and Australian Institute of Bioengineering and Nanotechnology, The University of Queensland, QLD 4072, Australia
Hui-Ming Cheng*
Affiliation:
Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, People’s Republic of China
*
a)Address all correspondence to this author. e-mail: maxlu@uq.edu.au
b)Address all correspondence to this author. e-mail: cheng@imr.ac.cn
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Abstract

ZnO-ZnS-CdS heterostructure photocatalysts for water splitting were designed and prepared by a wet chemistry method. It was found that ZnO-ZnS-CdS heterostructures are highly active photocatalysts for H2 evolution under simulated solar light irradiation in an aqueous solution containing SO32- and S2- ions as sacrificial reagents. H2 evolution with (ZnO)2-(ZnS)1-(CdS)1 heterostructure reaches up to 2790 μmol h−1 g−1. The photoexcited electrons in the ZnO-ZnS-CdS heterostructures have a much longer lifetime (>225 ns) than that of the sole ZnO, ZnS, and CdS (<65 ns). The favorable interface processes of the heterostructures make a significant contribution to high photocatalytic H2 evolution rate.

Keywords

Energy generationPhotochemicalSemiconducting
Type
Articles
Information
Journal of Materials Research , Volume 25 , Issue 1: Photocatalysis for Energy and Environmental Sustainability , January 2010 , pp. 39 - 44
Copyright
Copyright © Materials Research Society 2010

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References

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