Capacitance of p- and n-doped graphenes is dominated by structural defects regardless of the dopant type

Adriano Ambrosi, Hwee Ling Poh, Lu Wang, Zdenek Sofer, Martin Pumera

Research output: Contribution to journalArticle

35 Citations (Scopus)

Abstract

Graphene materials possess attractive properties that can be used for the fabrication of supercapacitors with enhanced energy-storage performance. It has been shown that both boron and nitrogen doping of graphene can improve the intrinsic capacitance of the material relative to the undoped precursor. We address the question of whether p-doping (using boron as dopant) or n-doping (using nitrogen as dopant) leads to increased capacitance relative to undoped graphene materials. Using thermal exfoliation we synthesized both boron- and nitrogen-doped graphene materials and measured capacitance relative to the undoped material. After a full characterization by SEM analysis, X-ray photoelectron spectroscopy, Raman spectroscopy, gamma-ray activation analysis, Brunauer-Emmett-Teller analysis, and electrochemical techniques we demonstrate that the doping process does not lead to enhancement of capacitive behavior and that the main characteristic influencing capacitance is the presence of structural defects within the graphitic structure, independent of doping level. Show the doping, get the capacitance: The distinctive structural differences between doped graphene materials in terms of density of defects revealed by Raman spectroscopy is the determining factor as far as their capacitive properties are concerned, whereas type and amount of the doping heteroatoms seem to be largely irrelevant.

Original languageEnglish
Pages (from-to)1102-1106
Number of pages5
JournalChemSusChem
Volume7
Issue number4
DOIs
Publication statusPublished - 2014 Apr

All Science Journal Classification (ASJC) codes

  • Environmental Chemistry
  • Chemical Engineering(all)
  • Materials Science(all)
  • Energy(all)

Fingerprint Dive into the research topics of 'Capacitance of p- and n-doped graphenes is dominated by structural defects regardless of the dopant type'. Together they form a unique fingerprint.

  • Cite this