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Fabricating Efficient CdSe–CdS Photocatalyst Systems by Spatially Resetting Water Splitting Sites

Abstract

Water oxidation and reduction over semiconductor-based photocatalysts intrinsically occur at different spatial sites. Modulation of the reaction sites and charge transfer between them are logically important in speeding up the reaction. Here, we demonstrate that divorcing a CdSe–CdS–Pt donor–acceptor system on different surface sites of TiO2 can significantly increase H2 generation rate. The increase is derived from effective reset of water oxidation and reduction sites. Widening of the site distance by employing TiO2 membraniform acceptor effectively decreases the electron–hole recombination especially for a membrane of TiO2 nanotube array. The oriented charge transfer characteristic of TiO2 nanotube array benefits electron long-range transport, thereby increasing the electron lifetime and reaction rate. When more conductive carbon nanotube array serves as electron acceptor to replace TiO2, the electron transport is greatly improved, resulting in an ultrahigh H2 generation rate of 1270 mmol•g−1•h−1. This work provides a basis toward the design and construction of highly efficient photocatalysts through rational modulation of reaction sites and charge transport.

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Publication details

The article was received on 13 Jul 2017, accepted on 14 Sep 2017 and first published on 15 Sep 2017


Article type: Communication
DOI: 10.1039/C7TA06085H
Citation: J. Mater. Chem. A, 2017, Accepted Manuscript
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    Fabricating Efficient CdSe–CdS Photocatalyst Systems by Spatially Resetting Water Splitting Sites

    Z. Wang, J. Wang, L. Li, J. Zheng, S. Jia, J. Chen, B. Liu and Z. Zhu, J. Mater. Chem. A, 2017, Accepted Manuscript , DOI: 10.1039/C7TA06085H

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