Modulation of the Electrostatic and Quantum Capacitances of Few Layered Graphenes through Plasma Processing


Narayanan R., Yamada H., KARAKAYA M. , Podila R., Rao A. M. , Bandaru P. R.

NANO LETTERS, vol.15, no.5, pp.3067-3072, 2015 (Journal Indexed in SCI) identifier identifier identifier

  • Publication Type: Article / Article
  • Volume: 15 Issue: 5
  • Publication Date: 2015
  • Doi Number: 10.1021/acs.nanolett.5b00055
  • Title of Journal : NANO LETTERS
  • Page Numbers: pp.3067-3072
  • Keywords: Graphene, charged defects, plasma processing charge correlation, quantum capacitance, energy storage, RAMAN-SPECTROSCOPY, GRAPHITE, DISORDER

Abstract

It is shown that charged defect generation, through argon ion-based plasma processing, in few layer graphene, could substantially enhance the electrical capacitance for electrochemical energy storage. Detailed consideration of the constituent space charge and quantum capacitances were used to delineate a new length scale, correlated to electrically active defects contributing to the capacitance, and was found to be smaller than a structural correlation length determined through Raman spectroscopy, The study offers insights into an industrially viable method (i.e., plasma processing) for modifying and enhancing the energy density of graphene-based electrochemical capacitors.