Elucidating graphene-ionic liquid interfacial region: A combined experimental and computational study

M. Vijayakumar, Birgit Schwenzer, V. Shutthanandan, Jian Zhi Hu, Jun Liu, Ilhan A. Aksay

Research output: Contribution to journalArticlepeer-review

30 Scopus citations

Abstract

Graphene and ionic liquids are promising candidates for electrode materials and electrolytes, respectively, for modern energy storage devices such as supercapacitors. Understanding the interactions at the interfacial region between these materials is crucial for optimizing the overall performance and efficiency of supercapacitors. The interfacial region between graphene and an imidazolium-based ionic liquid is analyzed in a combined experimental and computational study. This dual approach reveals that the imidazolium-based cations mostly orient themselves parallel to the graphene surface due to π-π stacking interaction and form a primary interfacial layer, which is subsequently capped by a layer of anions from the ionic liquid. However, it also becomes apparent that the molecular interplay at the interfacial region is highly influenced by functional group defects on the graphene surface, in particular by hydroxyl groups.

Original languageEnglish (US)
Pages (from-to)152-158
Number of pages7
JournalNano Energy
Volume3
DOIs
StatePublished - Jan 1 2014

All Science Journal Classification (ASJC) codes

  • Renewable Energy, Sustainability and the Environment
  • Materials Science(all)
  • Electrical and Electronic Engineering

Keywords

  • Graphene surface defects
  • Interfacial region
  • Ionic liquid
  • Molecular spectroscopy
  • Supercapacitors

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