Laser-reduced graphene-oxide/ferrocene: A 3-D redox-active composite for supercapacitor electrodes

Arie Borenstein, Volker Strauss, Matthew D. Kowal, Mitra Yoonessi, Mit Muni, Mackenzie Anderson, Richard B. Kaner

Research output: Contribution to journalArticlepeer-review

38 Scopus citations

Abstract

Supercapacitors are energy storage and conversion devices that display high power. In order to increase energy density, redox-active materials can be incorporated into the carbonaceous electrode(s). Although in recent years many studies have offered different redox-active candidates and composite methods, there is a constant search for an effective, easily producible and stable composite material. Here, we present a graphene/ferrocene composition as a redox active 3-D supercapacitor electrode material. The combination of highly reversible, conductive and strongly attached ferrocene with the high surface area and open porous structure of graphene results in high-power, high-energy density supercapacitors. The graphene scaffold is converted from graphene-oxide (GO) by laser irradiation, a facile, fast and eco-friendly method. The ferrocene is chemically bonded to the graphene by two different approaches that take advantage of the strong and stable pi-pi interactions between the carbon and the aromatic ligands. The excellent bonding between the components results in low internal resistance and high reversibility of the redox reaction. The composite demonstrated a 205% increase in specific capacitance from 87 F g-1 for pure laser reduced graphene oxide to 178 F g-1 for the composite with ferrocene. This is equivalent to an energy density of 6.19 W h kg-1 while maintaining a power density of 26.0 kW kg-1.

Original languageEnglish
Pages (from-to)20463-20472
Number of pages10
JournalJournal of Materials Chemistry A
Volume6
Issue number41
DOIs
StatePublished - 2018
Externally publishedYes

Bibliographical note

Publisher Copyright:
© 2018 The Royal Society of Chemistry.

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