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Issue 14, 2012
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Crystal facet-dependent photocatalytic oxidation and reduction reactivity of monoclinic WO3 for solar energy conversion

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Abstract

The reactivity of a photocatalyst is basically influenced by its surface atomic and linked electronic structure. Tuning different crystal facets is becoming an important strategy to optimize the reactivity of a photocatalyst for targeted reactions. Here we report a facile and new route of synthesizing a quasi-cubic-like WO3 crystal with a nearly equal percentage of {002}, {200} and {020} facets, and a rectangular sheet-like WO3 crystal with predominant {002} facet by controlling acidic hydrolysis of crystalline WB. As a result of electronic structure effects induced by crystal facet, the quasi-cubic-like WO3 crystal with a deeper valence band maximum shows a much higher O2 evolution rate in photocatalytic water oxidation than the rectangular sheet-like WO3 crystal. The latter, with an elevated conduction band minimum of 0.3 eV, is able to photoreduce CO2 to generate CH4 in the presence of H2O vapor.

Graphical abstract: Crystal facet-dependent photocatalytic oxidation and reduction reactivity of monoclinic WO3 for solar energy conversion

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Publication details

The article was received on 27 Nov 2011, accepted on 04 Feb 2012 and first published on 27 Feb 2012


Article type: Paper
DOI: 10.1039/C2JM16178H
Citation: J. Mater. Chem., 2012,22, 6746-6751
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    Crystal facet-dependent photocatalytic oxidation and reduction reactivity of monoclinic WO3 for solar energy conversion

    Y. P. Xie, G. Liu, L. Yin and H. Cheng, J. Mater. Chem., 2012, 22, 6746
    DOI: 10.1039/C2JM16178H

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