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https://hdl.handle.net/2440/81624
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Type: | Journal article |
Title: | Enhanced visible-light hydrogen-production activity of copper-modified ZnₓCd₁₋ₓS |
Other Titles: | Enhanced visible-light hydrogen-production activity of copper-modified Zn(x)Cd(1-x)S |
Author: | Zhang, J. Xu, Q. Qiao, S. Yu, J. |
Citation: | ChemSusChem: chemistry and sustainability, energy and materials, 2013; 6(10):2009-2015 |
Publisher: | Wiley - VCH Verlag GmbH & Co KGaA |
Issue Date: | 2013 |
ISSN: | 1864-5631 1864-564X |
Statement of Responsibility: | Jun Zhang, Quanlong Xu, Shi Zhang Qiao, and Jiaguo Yu |
Abstract: | Copper modification is an efficient way to enhance the photocatalytic activity of ZnS-based materials; however, the mechanisms of Cu(2+) 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 Cu(2+)-modified Znx Cd1-x S photocatalysts through cation-exchange and coprecipitation methods, respectively. Different Cu(2+) modifications brought different effects on the phase structure, morphology, surface area, optical property, as well as the photocatalytic H2-production activity of the final products. The optimized Cu(2+)-surface-modified Znx Cd1-x S photocatalyst has a high H2-production rate of 4638.5 μmolh(-1) g(-1) and an apparent quantum efficiency of 20.9% at 420 nm, exceeding that of Cu(2+)-bulk-modified catalyst at the same copper content. Cu(2+) 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. |
Keywords: | charge transfer copper hydrogen photochemistry water splitting |
Rights: | Copyright © 2013 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim |
DOI: | 10.1002/cssc.201300409 |
Published version: | http://dx.doi.org/10.1002/cssc.201300409 |
Appears in Collections: | Aurora harvest 4 Chemical Engineering publications |
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