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Issue 10, 2011
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Fabrication of efficient TaON and Ta3N5 photoanodes for water splitting under visible light irradiation

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Abstract

Efficient TaON and Ta3N5 photoanodes for water splitting were fabricated on conducting glass support (FTO). A necking treatment, which forms effective contacts between TaON (or Ta3N5) particles, afforded a significant increase in the photocurrent. Furthermore, loading of IrO2·nH2O nanoparticles as a cocatalyst for water oxidation improved the photocurrent of the TaON (or Ta3N5) photoanode. The incident photon to charge carrier efficiencies (IPCEs) of the TaON and Ta3N5 photoanodes were calculated to be ca. 76% at 400 nm and ca. 31% at 500 nm, respectively, at 1.15 V vs. reversible hydrogen electrode (RHE) in aqueous Na2SO4 solution. Overall water splitting into H2 and O2 under visible light was demonstrated using an IrO2·nH2O-loaded TaON (or Ta3N5) photoanode combined with a Pt electrode under an externally applied bias (TaON: > 0.6 V, Ta3N5: > 1.0 V).

Graphical abstract: Fabrication of efficient TaON and Ta3N5 photoanodes for water splitting under visible light irradiation

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Publication details

The article was received on 02 Jun 2011, accepted on 11 Jul 2011 and first published on 16 Aug 2011


Article type: Paper
DOI: 10.1039/C1EE01878G
Citation: Energy Environ. Sci., 2011,4, 4138-4147
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    Fabrication of efficient TaON and Ta3N5 photoanodes for water splitting under visible light irradiation

    M. Higashi, K. Domen and R. Abe, Energy Environ. Sci., 2011, 4, 4138
    DOI: 10.1039/C1EE01878G

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