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Flame Spray Pyrolysis Engineering of Nanosized Mullite-Bi 2 Fe 4 O 9 and Perovskite-BiFeO 3 as Highly Efficient Photocatalysts for O 2 Production from H 2 O Splitting

Author

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  • Pavlos Psathas

    (Laboratory of Physical Chemistry of Materials and Environment, Department of Physics, University of Ioannina, GR45110 Ioannina, Greece)

  • Maria Solakidou

    (Laboratory of Physical Chemistry of Materials and Environment, Department of Physics, University of Ioannina, GR45110 Ioannina, Greece)

  • Asterios Mantzanis

    (Laboratory of Physical Chemistry of Materials and Environment, Department of Physics, University of Ioannina, GR45110 Ioannina, Greece)

  • Yiannis Deligiannakis

    (Laboratory of Physical Chemistry of Materials and Environment, Department of Physics, University of Ioannina, GR45110 Ioannina, Greece
    Institute of Environment & Sustainable Development, University Research Center of Ioannina (URCI), GR45110 Ioannina, Greece)

Abstract

Bi-Fe oxides are stable materials with potential photocatalytic activity under solar light photons. So far, however the photocatalytic potential of pure-phase nanosized mullite-Bi 2 Fe 4 O 9 has not been studied. Usually, synthesis of pure-phase nanosized mullite-Bi 2 Fe 4 O 9 is hampered by co-formation with perovskite BiFeO 3 . Herein we demonstrate that pure-phase mullite-Bi 2 Fe 4 O 9 nanoparticles prepared by Flame Spray Pyrolysis (FSP) technology are highly efficient O 2 production photocatalysts, achieving >1500 μmol g −1 h −1 . This outperforms all -so far reported- O 2 production Bi-Fe-O photocatalysts. We present an FSP-based process for production of a versatile Bi-Fe-O platform, that can be easily optimized to obtain 100% mullite-Bi 2 Fe 4 O 9 or 100% perovskite-BiFeO 3 or their heterojunctions. The phase-evolution of the Bi-Fe-O materials has been studied by XPS, Raman, and EPR spectroscopies. Short post-FSP annealing process impacts the photoactivity of the BiFeO 3 and Bi 2 Fe 4 O 9 in distinct ways. Fe 2+ centers in BiFeO 3 can improve dramatically its O 2 production efficiency, while solid-melt formation in Bi 2 Fe 4 O 9 is a limiting factor.

Suggested Citation

  • Pavlos Psathas & Maria Solakidou & Asterios Mantzanis & Yiannis Deligiannakis, 2021. "Flame Spray Pyrolysis Engineering of Nanosized Mullite-Bi 2 Fe 4 O 9 and Perovskite-BiFeO 3 as Highly Efficient Photocatalysts for O 2 Production from H 2 O Splitting," Energies, MDPI, vol. 14(17), pages 1-16, August.
    • Handle: RePEc:gam:jeners:v:14:y:2021:i:17:p:5235-:d:621053
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    References listed on IDEAS

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    1. Maria Solakidou & Yiannis Georgiou & Yiannis Deligiannakis, 2021. "Double-Nozzle Flame Spray Pyrolysis as a Potent Technology to Engineer Noble Metal-TiO 2 Nanophotocatalysts for Efficient H 2 Production," Energies, MDPI, vol. 14(4), pages 1-16, February.
    2. Zhigang Zou & Jinhua Ye & Kazuhiro Sayama & Hironori Arakawa, 2001. "Direct splitting of water under visible light irradiation with an oxide semiconductor photocatalyst," Nature, Nature, vol. 414(6864), pages 625-627, December.
    3. Rengui Li & Fuxiang Zhang & Donge Wang & Jingxiu Yang & Mingrun Li & Jian Zhu & Xin Zhou & Hongxian Han & Can Li, 2013. "Spatial separation of photogenerated electrons and holes among {010} and {110} crystal facets of BiVO4," Nature Communications, Nature, vol. 4(1), pages 1-7, June.
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