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Cyclic voltammetric preparation of graphene-coated electrodes for positive electrode materials of vanadium redox flow battery

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Abstract

In this work, a one-step procedure for preparing graphene pencil graphite electrodes is developed by using cyclic voltammetry (CV). The potential is scanned from − 1.0 to + 1.90 V (vs. Ag/AgCl) in a sulfuric acid solution in this system. The in situ electrochemical oxidation of graphite to graphene oxide (GO) and then the electrochemical reduction of GO to graphene are observed in the cyclic voltammograms. The electrochemical behaviors of GO and graphene electrode are investigated by CV and electrochemical impedance spectroscopy. The morphological and physical properties of the graphene layers are elucidated by Raman spectroscopy, scanning electron microscopy, and X-ray photoelectron spectroscopy. The prepared graphene-coated electrodes are as the positive electrode component of a vanadium redox battery (VRB). The electrodes show excellent electrochemical performance and high cyclic stability (more than 500 cycles) in a VRB system. The presented processing route is faster, easier, less expensive, and more environmentally friendly than other electrochemical and chemical methods to obtain graphene electrodes.

Keywords

Pencil graphite electrode Graphene electrode Cyclic voltammetry Vanadium redox battery Sulfuric acid 

Notes

Acknowledgements

The authors would like to thank Dr. M. Baris Yagci for the XPS analysis. Y. Sahin thanks Prof. Dr. Ender SUVACI for his support to this study.

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Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2018

Authors and Affiliations

  • Hürmüs Gürsu
    • 1
  • Metin Gençten
    • 2
  • Yücel Şahin
    • 1
  1. 1.Department of Chemistry, Faculty of Arts & SciencesYildiz Technical UniversityIstanbulTurkey
  2. 2.Department of Metallurgical and Materials Engineering, Faculty of Chemical and Metallurgical EngineeringYildiz Technical UniversityIstanbulTurkey

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