Transition metal-depleted graphenes for electrochemical applications via reduction of CO2 by lithium

Hwee Ling Poh, Zdenek Sofer, Jan Luxa, Martin Pumera

Research output: Contribution to journalArticle

18 Citations (Scopus)

Abstract

Graphene has immense potential for future applications in the electrochemical field, such as in supercapacitors, fuel cells, batteries, or sensors. Graphene materials for such applications are typically fabricated through a top-down approach towards oxidation of graphite to graphite oxide, with consequent exfoliation/reduction to yield reduced graphenes. Such a method allows the manufacture of graphenes in gram/kilogram quantities. However, graphenes prepared by this method can contain residual metallic impurities from graphite which dominate the electrochemical properties of the graphene formed. This dominance hampers their electrochemical application. The fabrication of transition metal-depleted graphene is described, using ultrapure CO2 (with benefits of low cost and easy availability) and elemental lithium by means of reduction of CO2 to graphene. This preparation method produces graphene of high purity with electrochemical behavior that is not dominated by any residual transition metal impurities which would dramatically alter its electrochemical properties. Wide application of such methodology in industry and research laboratories is foreseen, especially where graphene is used for electrochemical devices. The fabrication of transition metal-depleted graphene is described, by using ultrapure CO2 (with benefits of low cost and easy availability) and elemental lithium to reduce CO2 to form graphene. Such a preparation method produces graphene of high purity with electrochemical behavior that is not dominated by any residual transition metal impurities, which would dramatically alter its electrochemical properties.

Original languageEnglish
Pages (from-to)1529-1535
Number of pages7
JournalSmall
Volume10
Issue number8
DOIs
Publication statusPublished - 2014 Apr 24

All Science Journal Classification (ASJC) codes

  • Biotechnology
  • Biomaterials
  • Chemistry(all)
  • Materials Science(all)

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