Solar-driven Z-scheme water splitting using tantalum/nitrogen co-doped rutile titania nanorod as an oxygen evolution photocatalyst

Akinobu Nakada; Shunta Nishioka; Junie Jhon M. Vequizo; Kanemichi Muraoka; Tomoki Kanazawa; Akira Yamakata; Shunsuke Nozawa; Hiromu Kumagai; Shin Ichi Adachi; Osamu Ishitani; Kazuhiko Maeda

doi:10.1039/c6ta10541f

Solar-driven Z-scheme water splitting using tantalum/nitrogen co-doped rutile titania nanorod as an oxygen evolution photocatalyst

Akinobu Nakada, Shunta Nishioka, Junie Jhon M. Vequizo, Kanemichi Muraoka, Tomoki Kanazawa, Akira Yamakata, Shunsuke Nozawa, Hiromu Kumagai, Shin Ichi Adachi, Osamu Ishitani, Kazuhiko Maeda

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Abstract

A visible-light-driven water-splitting system that involves two-step photoexcitation (Z-scheme) was constructed using rutile TiO₂ nanorod doped with Ta and N (TiO₂:Ta/N) as an O₂ evolution photocatalyst. The Ta-doped TiO₂ nanorods, prepared by a solvothermal synthesis, underwent nitridation to possess visible-light absorption under mild conditions, even at 623 K under an ammonia flow. The TiO₂:Ta/N powders modified with a RuO₂ cocatalyst were active under visible light up to 540 nm for water oxidation for producing O₂ in the presence of reversible electron acceptors (IO₃^- or Fe³⁺), while TiO₂:N exhibited negligible activity. The results of time-resolved infrared absorption spectroscopy indicated that co-doping Ta with N into TiO₂ prolonged the lifetime of photogenerated free electrons, leading to high photocatalytic activity. Simultaneous H₂ and O₂ evolution via water splitting was achieved using a combination of RuO₂-modified TiO₂:Ta/N, Ru-loaded SrTiO₃:Rh and an Fe³⁺/Fe²⁺ redox couple under visible-light irradiation (λ > 420 nm) and under AM 1.5G simulated sunlight.

Original language	English
Pages (from-to)	11710-11719
Number of pages	10
Journal	Journal of Materials Chemistry A
Volume	5
Issue number	23
DOIs	https://doi.org/10.1039/c6ta10541f
Publication status	Published - 2017
Externally published	Yes

ASJC Scopus subject areas

Chemistry(all)
Renewable Energy, Sustainability and the Environment
Materials Science(all)

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This output contributes to the following UN Sustainable Development Goals (SDGs)

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10.1039/c6ta10541f

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Nakada, A., Nishioka, S., Vequizo, J. J. M., Muraoka, K., Kanazawa, T., Yamakata, A., Nozawa, S., Kumagai, H., Adachi, S. I., Ishitani, O., & Maeda, K. (2017). Solar-driven Z-scheme water splitting using tantalum/nitrogen co-doped rutile titania nanorod as an oxygen evolution photocatalyst. Journal of Materials Chemistry A, 5(23), 11710-11719. https://doi.org/10.1039/c6ta10541f

Nakada, A, Nishioka, S, Vequizo, JJM, Muraoka, K, Kanazawa, T, Yamakata, A, Nozawa, S, Kumagai, H, Adachi, SI, Ishitani, O & Maeda, K 2017, 'Solar-driven Z-scheme water splitting using tantalum/nitrogen co-doped rutile titania nanorod as an oxygen evolution photocatalyst', Journal of Materials Chemistry A, vol. 5, no. 23, pp. 11710-11719. https://doi.org/10.1039/c6ta10541f

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title = "Solar-driven Z-scheme water splitting using tantalum/nitrogen co-doped rutile titania nanorod as an oxygen evolution photocatalyst",

abstract = "A visible-light-driven water-splitting system that involves two-step photoexcitation (Z-scheme) was constructed using rutile TiO2 nanorod doped with Ta and N (TiO2:Ta/N) as an O2 evolution photocatalyst. The Ta-doped TiO2 nanorods, prepared by a solvothermal synthesis, underwent nitridation to possess visible-light absorption under mild conditions, even at 623 K under an ammonia flow. The TiO2:Ta/N powders modified with a RuO2 cocatalyst were active under visible light up to 540 nm for water oxidation for producing O2 in the presence of reversible electron acceptors (IO3- or Fe3+), while TiO2:N exhibited negligible activity. The results of time-resolved infrared absorption spectroscopy indicated that co-doping Ta with N into TiO2 prolonged the lifetime of photogenerated free electrons, leading to high photocatalytic activity. Simultaneous H2 and O2 evolution via water splitting was achieved using a combination of RuO2-modified TiO2:Ta/N, Ru-loaded SrTiO3:Rh and an Fe3+/Fe2+ redox couple under visible-light irradiation (λ > 420 nm) and under AM 1.5G simulated sunlight.",

author = "Akinobu Nakada and Shunta Nishioka and Vequizo, {Junie Jhon M.} and Kanemichi Muraoka and Tomoki Kanazawa and Akira Yamakata and Shunsuke Nozawa and Hiromu Kumagai and Adachi, {Shin Ichi} and Osamu Ishitani and Kazuhiko Maeda",

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year = "2017",

doi = "10.1039/c6ta10541f",

language = "English",

volume = "5",

pages = "11710--11719",

journal = "Journal of Materials Chemistry A",

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T1 - Solar-driven Z-scheme water splitting using tantalum/nitrogen co-doped rutile titania nanorod as an oxygen evolution photocatalyst

AU - Nakada, Akinobu

AU - Nishioka, Shunta

AU - Vequizo, Junie Jhon M.

AU - Muraoka, Kanemichi

AU - Kanazawa, Tomoki

AU - Yamakata, Akira

AU - Nozawa, Shunsuke

AU - Kumagai, Hiromu

AU - Adachi, Shin Ichi

AU - Ishitani, Osamu

AU - Maeda, Kazuhiko

PY - 2017

Y1 - 2017

N2 - A visible-light-driven water-splitting system that involves two-step photoexcitation (Z-scheme) was constructed using rutile TiO2 nanorod doped with Ta and N (TiO2:Ta/N) as an O2 evolution photocatalyst. The Ta-doped TiO2 nanorods, prepared by a solvothermal synthesis, underwent nitridation to possess visible-light absorption under mild conditions, even at 623 K under an ammonia flow. The TiO2:Ta/N powders modified with a RuO2 cocatalyst were active under visible light up to 540 nm for water oxidation for producing O2 in the presence of reversible electron acceptors (IO3- or Fe3+), while TiO2:N exhibited negligible activity. The results of time-resolved infrared absorption spectroscopy indicated that co-doping Ta with N into TiO2 prolonged the lifetime of photogenerated free electrons, leading to high photocatalytic activity. Simultaneous H2 and O2 evolution via water splitting was achieved using a combination of RuO2-modified TiO2:Ta/N, Ru-loaded SrTiO3:Rh and an Fe3+/Fe2+ redox couple under visible-light irradiation (λ > 420 nm) and under AM 1.5G simulated sunlight.

AB - A visible-light-driven water-splitting system that involves two-step photoexcitation (Z-scheme) was constructed using rutile TiO2 nanorod doped with Ta and N (TiO2:Ta/N) as an O2 evolution photocatalyst. The Ta-doped TiO2 nanorods, prepared by a solvothermal synthesis, underwent nitridation to possess visible-light absorption under mild conditions, even at 623 K under an ammonia flow. The TiO2:Ta/N powders modified with a RuO2 cocatalyst were active under visible light up to 540 nm for water oxidation for producing O2 in the presence of reversible electron acceptors (IO3- or Fe3+), while TiO2:N exhibited negligible activity. The results of time-resolved infrared absorption spectroscopy indicated that co-doping Ta with N into TiO2 prolonged the lifetime of photogenerated free electrons, leading to high photocatalytic activity. Simultaneous H2 and O2 evolution via water splitting was achieved using a combination of RuO2-modified TiO2:Ta/N, Ru-loaded SrTiO3:Rh and an Fe3+/Fe2+ redox couple under visible-light irradiation (λ > 420 nm) and under AM 1.5G simulated sunlight.

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Solar-driven Z-scheme water splitting using tantalum/nitrogen co-doped rutile titania nanorod as an oxygen evolution photocatalyst

Abstract

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