Effect of residual electrolyte on dispersion stability of graphene in aqueous solution

Hemraj Mahipati Yadav, Sae Youn Lee, Chan Hee Lee, Jongdeok Park, Jae Joon Lee

Research output: Contribution to journalArticlepeer-review

1 Scopus citations

Abstract

The stability of graphene dispersions in water is of both scientific and technological significance. We studied the dispersion stability of electrochemically exfoliated graphene in an aqueous medium to minimize the strong aggregation tendency, within a short period, of graphene prepared in various electrolytes. This study focused on increasing the dispersion stability of graphene and finding the reason for its poor dispersion stability. The residual electrolyte trapped in the graphene layers was difficult to be removed from electrochemically exfoliated graphite and caused a significant aggregation. The stability and dispersion concentration can be improved by removing the trace amount of aqueous electrolyte. The aggregation mechanism of graphene in aqueous media is proposed and discussed in detail.

Original languageEnglish
Pages (from-to)617-626
Number of pages10
JournalJournal of Solid State Electrochemistry
Volume25
Issue number2
DOIs
StatePublished - Feb 2021

Keywords

  • Dispersion in water
  • Electrochemical exfoliation
  • Electrolyte effect
  • Graphene dispersion
  • Surface interface

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