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Gold/WO3 nanocomposite photoanodes for plasmonic solar water splitting

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Abstract

A facile electron-charging and reducing method was developed to prepare Au/WO3 nanocomposites for plasmonic solar water splitting. The preparation method involved a charging step in which electrons were charged into WO3 under negative bias, and a subsequent reducing step in which the stored electrons were used to reductively deposit Au on the surface of WO3. The electron-charged WO3 (c-WO3) exhibited tunable reducibility that could be easily controlled by varying the charging parameters, and this property makes this method a universal strategy to prepare metal/WO3 composites. The obtained Au/WO3 nanocomposite showed greatly improved photoactivity toward the oxygen evolution reaction (OER) when compared with WO3. After Au decoration, the OER photocurrent was improved by a percentage of over 80% at low potentials (<0.6 V vs. SCE), and by a percentage of over 30% at high potentials (>1.0 V vs. SCE). Oxygen evolution measurements were performed to quantitatively determine the Faraday efficiency for OER, which reflected the amount of photocurrent consumed by water splitting. The Faraday efficiency for OER was improved from 74% at the WO3 photoanode to 94% at the Au-8/WO3 composite photoanode, and this is the first direct evidence that the Au decoration significantly restrained the anodic side reactions and enhanced the photoelectrochemical (PEC) OER efficiency. The high photoactivity of the composite photoanode toward OER was ascribed to the plasmon resonance energy transfer (PRET) enhancement and the catalytic enhancement of Au nanoparticles (NPs).

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  1. Key Laboratory of Aerospace Materials and Performance (Ministry of Education), School of Materials Science and Engineering, Beihang University, Beijing, 100191, China

    Dianyi Hu, Peng Diao, Di Xu & Qingyong Wu

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  1. Dianyi Hu
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  2. Peng Diao
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  3. Di Xu
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  4. Qingyong Wu
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Correspondence to Peng Diao.

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Hu, D., Diao, P., Xu, D. et al. Gold/WO3 nanocomposite photoanodes for plasmonic solar water splitting. Nano Res. 9, 1735–1751 (2016). https://doi.org/10.1007/s12274-016-1067-0

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