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Perovskite BiFeO3 nanocatalysts for electrochemical water oxidation

  • B. Jansi Rani
  • G. Ravi
  • R. YuvakkumarEmail author
  • M. Thambidurai
Brief Communication: Nano-structured materials (particles, fibers, colloids, composites, etc.)
  • 35 Downloads

Abstract

Perovskite BiFeO3 nanocatalyst electrodes for electrochemical water oxidation were fabricated using mineralizing agents, such as potassium hydroxide (KOH) and sodium hydroxide (NaOH) to produce two different kinds of morphologies, such as BiFeO3 nanocubes and nanorods by hydrothermal method. Pure-phase, good-quality rhombohedral BiFeO3 produced by NaOH was revealed by X-ray powder diffraction (XRD). Five intrinsic phonon vibration modes [Eg(1)+Ag(1)+Ag(2)+Ag(3)+Ag(4)] of rhombohedral BiFeO3 nanostructures were confirmed by Raman spectra. The optical properties of both nanocubes and nanorods were investigated by photoluminescence (PL) and UV-vis diffuse reflection spectra (UV-vis DRS). The optical bandgap of nanocubes and nanorods estimated by Tauc plot was 2.88 and 2.94 eV. The role of a mineralizing agent that strongly influenced the morphology of BiFeO3 was revealed by scanning electron microscope (SEM) images of nanocubes synthesized by KOH and nanorods by NaOH. Electrochemical water oxidation by the cyclic voltammogram (CV) study for nanorods exhibited a higher specific capacitance of 156 F/g at 10 mV/s scan rate and possessed higher water oxidation catalytic activity observed by the current density of 1.77 mA/g at 10 mV/s from the linear sweep voltammogram (LSV) study and higher ionic mobility and conductivity with a smaller Tafel slope value of 229 mV/dec. The stability was reported for 4 h for both the electrodes with 99% activity.

Highlights

  • BiFeO3 nanorods exhibited a higher specific capacitance of 156 F/g at 10 mV/s.

  • Higher water oxidation by current density of 1.77 mA/g at 10 mV/s.

  • Higher ionic mobility and conductivity with a smaller Tafel slope value of 229 mV/dec.

Keywords

BiFeO3 Nanocatalysts Water oxidation 

Notes

Acknowledgements

This work was supported by UGC Start-Up Research Grant No.F.30-326/2016 (BSR). This article has been written with the financial support of RUSA-Phase 2 grant sanctioned vide Letter No. 24-51/2014-U, Policy (TNMulti-Gen), Department of Education of Government of India, Dt.10.09.2018.

Compliance with ethical standards

Conflict of interest

The authors declare that they have no conflict of interest.

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Copyright information

© Springer Science+Business Media, LLC, part of Springer Nature 2019

Authors and Affiliations

  • B. Jansi Rani
    • 1
  • G. Ravi
    • 1
  • R. Yuvakkumar
    • 1
    Email author
  • M. Thambidurai
    • 2
  1. 1.Nanomaterials Laboratory, Department of PhysicsAlagappa UniversityKaraikudiIndia
  2. 2.Luminous! Centre of Excellence for Semiconductor Lighting and Displays, School of Electrical & Electronic Engineering, The Photonics Institute (TPI)Nanyang Technological UniversitySingaporeSingapore

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