Role of Peroxide Ions in Formation of Graphene Nanosheets by Electrochemical Exfoliation of Graphite

This study demonstrates a facile, mild and environmentally-friendly sustainable approach for the efficient electrochemical exfoliation of graphite using a sodium hydroxide/hydrogen peroxide/water system that can produce high-quality, anodic few-layer graphene nanosheets in 95% yield at ambient reaction conditions

Kodepelly Sanjeeva Rao; Jaganathan Senthilnathan; Yung-Fang Liu; Masahiro Yoshimura

2014

Scholarcy highlights

  • Promotion Centre for Global Materials Research, Department of Material Science and Engineering, National Cheng Kung University, Tainan, Taiwan
  • This study demonstrates a facile, mild and environmentally-friendly sustainable approach for the efficient electrochemical exfoliation of graphite using a sodium hydroxide/hydrogen peroxide/water system that can produce high-quality, anodic few-layer graphene nanosheets in 95% yield at ambient reaction conditions
  • The reaction of H2O2 with hydroxyl ions leads to the formation of highly nucleophilic peroxide ions, which play a crucial role in the exfoliation of graphite via electrochemical-potential-assisted intercalation and strong expansion of graphite sheets
  • The exfoliation mechanism was examined to understand the role of H2O2 in the electrochemical exfoliation process
  • A possible exfoliation mechanism based on the experimental results and published literature is proposed
  • Similar intercalation of O222 ions into graphite has been reported in previous papers, where sodium metal in presence of oxygen was used to prepare O222 ions
  • Graphite rod was inserted as anode into the electrolytic solution, placed parallel to the Pt sheet as counter-electrode with 5 cm separation

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