In-situ photo-reducing graphene oxide to create Zn0.5Cd0.5S porous nanosheets/RGO composites as highly stable and efficient photoelectrocatalysts for visible-light-driven water splitting
Date
2014
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Zhang, J.
Zhao, W.
Xu, Y.
Xu, H.
Zhang, B.
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International Journal of Hydrogen Energy, 2014; 39(2):702-710
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Nanoporous Zn0.5Cd0.5S nanosheets/reduced graphene oxide (Zn0.5Cd0.5S/RGO) composites were prepared by a facile in-situ photo reduction method of graphene oxide (GO) in the presence of nanoporous Zn0.5Cd0.5S single-crystal-like nanosheets under visible light irradiation.The Zn0.5Cd0.5S/RGO photo electrodes was characterized by TEM, IR and Ramanspectra. Electrochemical measurements demonstrated that Zn0.5Cd0.5S/RGO photo electrodes own a higher anodic photocurrent density, a lower zero current potential, and a higher photo electrochemical response than that of pure Zn0.5Cd0.5S photo electrodes under visible light irradiation under the same conditions. This high photochemical activity is predominately ascribed to the presence of RGO, which serves as the electron collector to efficiently prolong the lifetime of photo induced electrons from the excited Zn0.5Cd0.5S nanosheets. In addition, the content of RGO in the composites had a remarkable influence on the photo electrochemical behaviors of the photoelectrodes and the optimal RGO content was found tobe 5 wt%. Zn0.5Cd0.5S/RGO composites at RGO content of 5 wt% reached a stable hydrogen production rate of 12.05 mmol h1 cm2 at an externally applied bias of 0.6 V. Furthermore,the Zn0.5Cd0.5S/RGO composites as photoelectrodes were found to be highly stable for hydrogen evolution reaction. The electrons stored in RGO are readily discharged or scavenged on demand by the applied positive bias to the counter electrode, and thus rectify the flow of electrons. Importantly, this work may open up a facile in-situ method for using RGOscaffold to create a stable photoelectrode with enhanced photo electrochemical activities.Crown Copyright
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Copyright 2013, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. Allrights reserved.