Colloidal WO3 Nanowires as a Versatile Route to Prepare a Photoanode for Solar Water Splitting

Authors

  • Ricardo H. Gonçalves,

    Corresponding author
    1. Department of Chemistry, Federal University of Sao Carlos, 13565-905 Sao Carlos, SP (Brazil), Fax: (+55) 16 3351 8214
    • Department of Chemistry, Federal University of Sao Carlos, 13565-905 Sao Carlos, SP (Brazil), Fax: (+55) 16 3351 8214
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  • Lucas D. T. Leite,

    1. Department of Chemistry, Federal University of Sao Carlos, 13565-905 Sao Carlos, SP (Brazil), Fax: (+55) 16 3351 8214
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  • Prof. Dr. Edson R. Leite

    Corresponding author
    1. Department of Chemistry, Federal University of Sao Carlos, 13565-905 Sao Carlos, SP (Brazil), Fax: (+55) 16 3351 8214
    • Department of Chemistry, Federal University of Sao Carlos, 13565-905 Sao Carlos, SP (Brazil), Fax: (+55) 16 3351 8214
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Abstract

This work describes a synthetic method to produce a WO3 nanowire as well as to prepare photoanodes by colloidal nanowire deposition. We also studied the influence of a nanowire phase on the photoanode performance for water splitting. Among the nanowires synthesized by using nonhydrolytic media, the orthorhombic WO3H2O nanowire produced a photoanode with excellent performance (a photocurrent of 1.96 mA cm−2 at 1.23 VRHE) and good photocurrent stability during long-term analysis (chronoamperometry test). The structural and photoelectrochemical characterization showed the importance of nanostructural features such as exposed (200), (020), and (002) facets and porosity in the WO3 photoanode performance.

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