Enhanced visible-light hydrogen-production activity of copper-modified ZnxCd1-xS

Zhang, Jun, Xu, Quanlong, Qiao, Shi Zhang and Yu, Jiaguo (2013) Enhanced visible-light hydrogen-production activity of copper-modified ZnxCd1-xS. ChemSusChem, 6 10: 2009-2015. doi:10.1002/cssc.201300409


Author Zhang, Jun
Xu, Quanlong
Qiao, Shi Zhang
Yu, Jiaguo
Title Enhanced visible-light hydrogen-production activity of copper-modified ZnxCd1-xS
Journal name ChemSusChem   Check publisher's open access policy
ISSN 1864-5631
1864-564X
Publication date 2013-01-01
Year available 2013
Sub-type Article (original research)
DOI 10.1002/cssc.201300409
Open Access Status Not yet assessed
Volume 6
Issue 10
Start page 2009
End page 2015
Total pages 7
Place of publication Weinheim, Germany
Publisher Wiley - V C H Verlag
Language eng
Abstract Copper modification is an efficient way to enhance the photocatalytic activity of ZnS-based materials; however, the mechanisms of Cu2+ surface and bulk modifications for improving the activity are quite different. In this work, two different synthetic pathways were devised to prepare surface and bulk Cu2+-modified ZnxCd1-xS photocatalysts through cation-exchange and coprecipitation methods, respectively. Different Cu2+ modifications brought different effects on the phase structure, morphology, surface area, optical property, as well as the photocatalytic H 2-production activity of the final products. The optimized Cu 2+-surface-modified ZnxCd1-xS photocatalyst has a high H2-production rate of 4638.5 μmol h-1 g -1 and an apparent quantum efficiency of 20.9 % at 420 nm, exceeding that of Cu2+-bulk-modified catalyst at the same copper content. Cu2+ surface modification not only brings a new electron-transferring pathway (interfacial charge transfer), but also produces new surface active sites for H2 evolution, reducing the recombination rate of photogenerated charge carriers. Surface modification: Two different synthetic pathways are devised to prepare surface and bulk Cu2+-modified ZnxCd1-xS through cation-exchange and coprecipitation methods, respectively. Cu2+ surface modification can provide a new electron-transferring pathway (interfacial charge transfer) and also form new surface active sites for H2 evolution, resulting in enhanced visible-light H2-production activity (see picture). Copyright
Keyword Charge transfer
Copper
Hydrogen
Photochemistry
Water splitting
Q-Index Code C1
Q-Index Status Provisional Code
Grant ID 2013CB632402
2012AA062701
51102190
2013-VII-030
2013-ZD-1
DP1095861
Institutional Status Non-UQ

Document type: Journal Article
Sub-type: Article (original research)
Collection: Australian Institute for Bioengineering and Nanotechnology Publications
 
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