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Issue 24, 2013
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Understanding the photoelectrochemical properties of a reduced graphene oxide–WO3 heterojunction photoanode for efficient solar-light-driven overall water splitting

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Abstract

WO3–reduced graphene oxide (WO3–RGO) heterojunction electrodes were prepared for photoelectrochemical (PEC) overall water splitting. The WO3 photoanode incorporated with RGO showed significantly enhanced PEC properties and, hence, photocatalytic water splitting, compared to the bare WO3 at a bias larger than 0.7 V vs. Ag/AgCl, while a decrease in the PEC properties of WO3–RGO compared to the WO3 electrode was observed at a bias smaller than 0.7 V vs. Ag/AgCl. RGO could play a favorable role in enhancing the electron–hole separation due to the presence of interface states according to the Bardeen model, but it could also provide active sites for the electron–hole recombination. A more positive applied bias is in favor of effective electron–hole separation, by means of quick collection and transport of electrons by RGO. As a result, a higher PEC performance of WO3–RGO can only be realised at a relatively more positive bias. This study gives insights into the complex nature of a RGO–semiconductor heterojunction, and its implications on the overall photoconversion efficiency.

Graphical abstract: Understanding the photoelectrochemical properties of a reduced graphene oxide–WO3 heterojunction photoanode for efficient solar-light-driven overall water splitting

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Publication details

The article was received on 31 Jan 2013, accepted on 03 Apr 2013 and first published on 03 Apr 2013


Article type: Paper
DOI: 10.1039/C3RA40550H
RSC Adv., 2013,3, 9330-9336

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    Understanding the photoelectrochemical properties of a reduced graphene oxide–WO3 heterojunction photoanode for efficient solar-light-driven overall water splitting

    J. Lin, P. Hu, Y. Zhang, M. Fan, Z. He, C. K. Ngaw, J. S. C. Loo, D. Liao and T. T. Y. Tan, RSC Adv., 2013, 3, 9330
    DOI: 10.1039/C3RA40550H

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