Soft processing of graphene nanosheets by glycine-bisulfate ionic-complex-assisted electrochemical exfoliation of graphite for reduction catalysis

Kodepelly Sanjeeva Rao, Jaganathan Sentilnathan, Hsun Wei Cho, Jih Jen Wu, Masahiro Yoshimura

Research output: Contribution to journalArticlepeer-review

51 Citations (Scopus)

Abstract

This study demonstrates a mild, environmentally friendly, and cost-effective soft processing approach for the continuous synthesis of high-quality, few-layer graphene nanosheets. This has been achieved via electrochemical exfoliation of graphite, using an environmentally friendly glycine-bisulfate ionic complex and was performed under ambient reaction conditions. Graphene nanosheets with 2-5 layers were obtained under optimized exfoliation conditions using a 15 wt% glycine-bisulfate (aqueous) solution, with working biases of +1 V and +3 V applied for 5 min. The role of the glycine-bisulfate ionic complex in the electrochemical exfoliation process was confirmed through comparison with a control experiment using only sulfuric acid as the electrolyte. A plausible electrochemical exfoliation mechanism that involves the formation of surface molecule nuclei via the polymerization of intercalated monomeric HSO4 - and SO4 2- ions is proposed. The ionic complex plays a key role in the anodic graphite exfoliation via electrochemical-potential-induced intercalation, leading to an efficient expansion of graphite sheets via the insertion of oxygen functional groups.

Original languageEnglish
Pages (from-to)298-305
Number of pages8
JournalAdvanced Functional Materials
Volume25
Issue number2
DOIs
Publication statusPublished - 2015 Jan 14

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics

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