A Simple and Robust Functionalization of Graphene for Advanced Energy Devices

Rizwan Khan, Ryo Nakagawa, Benoit Campeon, Yuta Nishina

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

Efficient and selective methods for graphene functionalization are needed because they allow tuning of the graphene surface and electronic properties. To date, graphene has been functionalized using ionic bonds, π-πinteractions, and covalent bonds. Graphene derivatives based on these methods have been used in various applications, but a new functionalization strategy that improves the properties of graphene is still needed. Herein, a new concept for graphene functionalization using halogenated graphene has been developed, in which brominated graphene is successfully functionalized by heteroatom-containing molecules to form onium bonds, such as pyridinium or ammonium. The counterion bromide is replaced with other anions, such as sulfate, by treating with sulfuric acid while retaining the molecules, which demonstrates the durable properties of onium bonding. To emphasize the advantages of this strategy for graphene functionalization, the performance for energy-related applications, such as biofuel cells, supercapacitors, and Li-ion batteries, is evaluated after introducing redox-active moieties onto graphene through onium bonding. This new graphene functionalization concept will provide a new approach to the design of tailor-made materials with targeted functions.

Original languageEnglish
Pages (from-to)12736-12742
Number of pages7
JournalACS Applied Materials and Interfaces
Volume12
Issue number11
DOIs
Publication statusPublished - Mar 18 2020

Keywords

  • electrodes
  • energy devices
  • graphene
  • onium bond
  • pyridinium
  • quaternary ammonium

ASJC Scopus subject areas

  • Materials Science(all)

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