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Issue 6, 2009
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Redox properties of gold-substituted zirconia surfaces

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Abstract

We report the use of quantum mechanical calculations based on the density functional theory (DFT) to investigate the redox properties of zirconia surfaces with cationic gold centres. Two different charge compensation mechanisms for the Au/Zr substitution at the cubic zirconia (111) surface are investigated: formation of oxygen vacancies and surface protonation. Regardless of the mechanism of charge compensation, gold dopants are more likely to accumulate at the surface than to migrate to the zirconia bulk. We investigate the formation of oxygen vacancies in the pure and gold-substituted surfaces, exploring a range of vacancy configurations, and we show that the presence of gold in lattice positions at the zirconia surface induces a dramatic change in the redox properties of the surface, which becomes easily reducible thanks to Au(III) → Au(I) transitions.

Graphical abstract: Redox properties of gold-substituted zirconia surfaces

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Publication details

The article was received on 17 Jul 2008, accepted on 29 Oct 2008 and first published on 16 Dec 2008


Article type: Paper
DOI: 10.1039/B812245H
Citation: J. Mater. Chem., 2009,19, 710-717
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    Redox properties of gold-substituted zirconia surfaces

    R. Grau-Crespo, N. C. Hernández, J. F. Sanz and N. H. de Leeuw, J. Mater. Chem., 2009, 19, 710
    DOI: 10.1039/B812245H

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