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Proton conduction through oxygen functionalized few-layer graphene.

Chanderpratap Singh1, Nikhil S1, Anwesha Jana1

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This study introduces oxygen functionalized few-layer graphene (OFG) as a superior proton conductor by leveraging edge functionalities. The novel OFG material also demonstrates remarkable supercapacitor capabilities.

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Nanotechnology

Background:

  • Proton conduction in graphene-based materials is crucial for energy applications.
  • Theoretical limitations hinder efficient proton transport through graphene basal planes.
  • Edge-plane functionalities offer an alternative pathway for proton conduction.

Purpose of the Study:

  • To report the first instance of oxygen functionalized few-layer graphene (OFG) as an effective proton conductor.
  • To investigate the role of hydrophilic oxygen functionalities at sheet edges in enhancing proton conductivity.
  • To evaluate the supercapacitor performance of the synthesized OFG.

Main Methods:

  • Synthesis of oxygen functionalized few-layer graphene (OFG).
  • Characterization of OFG's interlayer distance and surface functionalities.
  • Measurement of proton conductivity under varying temperature and humidity.
  • Electrochemical testing for supercapacitor performance evaluation.

Main Results:

  • OFG achieved a proton conductivity of 8.7 × 10⁻³ S cm⁻¹ at 80 °C and 95% RH.
  • The enhanced conductivity utilized hydrophilic oxygen functionalities at the sheet edges.
  • OFG demonstrated a high supercapacitor performance of 296 F g⁻¹.
  • The material bypassed theoretical limitations of basal plane proton conduction.

Conclusions:

  • Oxygen functionalized few-layer graphene (OFG) is a promising material for proton-conductive applications.
  • Utilizing edge-plane functionalities overcomes limitations in graphene-based proton conductors.
  • OFG exhibits dual functionality, serving as both an excellent proton conductor and a high-performance supercapacitor material.