首页|BiFeO3 bandgap engineering by dopants and defects control for efficient photocatalytic water oxidation

BiFeO3 bandgap engineering by dopants and defects control for efficient photocatalytic water oxidation

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Tuning the electronic structure of a semiconductor via defects engineering is an effective strategy to modulate its I band structure and charge carrier transport for superior photocatalytic properties.Herein,we report visible-light driven photocatalytic water oxidation on BiFeO3 nanoplates with Ti-dopants and oxygen vacancies,synthesized via facile hydrothermal method followed by thermal treatment in H2 atmosphere.The gradual increase of Ti-1 dopants progressively changes BiFeO3 morphology from rectangular cuboids to nanoplates.The introduction of Ti-dopants and oxygen vacancies tuned the band-gap of BiFeO3,enhanced visible light absorption,improved photogenerated charge-carrier dynamics,and higher driving force for O2 evolution to demonstrate excellent O2 evolution at a rate of 274 pmol h~(-1)g~(-1)which is 2.6 times higher compared to pristine BiFeO3.Furthermore,threefold higher photocurrent density and superior surface photovoltage(SPV)results confirm improved charge carrier dynamics in BiFeO3 with Ti-dopants and oxygen vacancies,which make BiFeO3-based nanoplates promising material for photocatalytic applications.

BiFeO3Ti-dopingH2-treatmentBand-gap engineeringO2 evolution

Essossimna Djatoubai、Muhammad Shuaib Khan、Sajjad ul Haq

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International Research Center for Renewable Energy(IRCRE),State Key Laboratory of Multiphase Flow in Power Engineering(MPFE),Xi'an Jiaotong University,28 West Xianning Road,Xi'an 710049,PR China

2022

10.1016/j.apcata.2022.118737

Applied Catalysis

Applied Catalysis

ISSN：0926-860X
年,卷(期)：2022.643
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