Flux Synthesis of Layered Oxyhalide Bi4 NbO8 Cl Photocatalyst for Efficient Z-Scheme Water Splitting Under Visible Light

ACS Applied Materials & Interfaces
Kanta OgawaRyu Abe

Abstract

An oxyhalide photocatalyst Bi4NbO8Cl has recently been proven to stably oxidize water under visible light, enabling the Z-scheme water splitting when coupled with another photocatalyst for water reduction. We herein report the synthesis of Bi4NbO8Cl particles via a flux method, testing various molten salts to improve its crystallinity and hence photocatalytic activity. The eutectic mixture of CsCl/NaCl with a low melting point allowed the formation of single-phase Bi4NbO8Cl at as low as 650 °C. Thus, synthesized Bi4NbO8Cl particles exhibited a well-grown and plate-like shape while maintaining surface area considerably higher than those grown with others fluxes. They showed three times higher O2 evolution rate under visible light than the samples prepared via a solid-state reaction. Time-resolved microwave conductivity measurements revealed greater signals (approximately 4.8 times) owing to the free electrons in the conduction band, indicating much improved efficiency of carrier generation and/or its mobility. The loading of RuO2 or Pt cocatalyst on Bi4NbO8Cl further enhanced the activity for O2 evolution because of efficient capturing of free electrons, facilitating the surface chemical reactions. In combination with a H2-evolv...Continue Reading

References

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Feb 16, 2016·Journal of the American Chemical Society·Hironori FujitoRyu Abe

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Citations

Apr 6, 2019·Dalton Transactions : an International Journal of Inorganic Chemistry·Kaustav ChatterjeeUjjal K Gautam
Apr 11, 2020·Advanced Science·Boon-Junn NgSiang-Piao Chai
Jan 9, 2021·Journal of the American Chemical Society·Akinobu NakadaRyu Abe
Jan 14, 2021·Advanced Science·Sen LinYihe Zhang
Jul 29, 2021·ACS Applied Materials & Interfaces·Kaustav Chatterjee, Sara E Skrabalak
Apr 10, 2019·The Journal of Physical Chemistry Letters·Kento YamadaAkinori Saeki

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