Charge Storage Properties of Aqueous Halide Supercapatteries with Activated Carbon and Graphene Nanoplatelets as Active Electrode Materials

Bamidele Akinwolemiwa, Chaohui Wei, Qinghua Yang, George Z. Chen

    Research output: Journal PublicationArticlepeer-review

    1 Citation (Scopus)

    Abstract

    Device level performance of aqueous halide supercapatteries fabricated with equal electrode mass of activated carbon or graphene nanoplatelets has been characterized. It was revealed that the surface oxygen groups in the graphitic structures of the nanoplatelets contributed toward a more enhanced charge storage capacity in bromide containing redox electrolytes. Moreover, the rate performance of the devices could be linked to the effect of the pore size of the carbons on the dynamics of the inactive alkali metal counterion of the redox halide salt. Additionally, the charge storage performance of aqueous halide supercapatteries with graphene nanoplatelets as the electrode material may be attributed to the combined effect of the porous structure on the dynamics of the non-active cations and a possible interaction of the Br/(Br2 + Br3) redox triple with the surface oxygen groups within the graphitic layer of the nanoplatelets. Generally, it has been shown that the surface groups and microstructure of electrode materials must be critically correlated with the redox electrolytes in the ongoing efforts to commercialize these devices.

    Original languageEnglish
    Pages (from-to)481-491
    Number of pages11
    JournalEnergy and Environmental Materials
    Volume4
    Issue number3
    DOIs
    Publication statusPublished - Jul 2021

    Keywords

    • carbon materials
    • device engineering
    • energy efficiency
    • redox electrolyte
    • supercapattery

    ASJC Scopus subject areas

    • Renewable Energy, Sustainability and the Environment
    • Energy (miscellaneous)
    • Materials Science (all)
    • Waste Management and Disposal
    • Water Science and Technology
    • Environmental Science (miscellaneous)

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