Hierarchical networks of redox-active reduced crumpled graphene oxide and functionalized few-walled carbon nanotubes for rapid electrochemical energy storage

Byeongyong Lee, Chongmin Lee, Tianyuan Liu, Kwangsup Eom, Zhongming Chen, Suguru Noda, Thomas F. Fuller, Hee Dong Jang, Seung Woo Lee

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    20 Citations (Scopus)

    Abstract

    Crumpled graphene is known to have a strong aggregation-resistive property due to its unique 3D morphology, providing a promising solution to prevent the restacking issue of graphene based electrode materials. Here, we demonstrate the utilization of redox-active oxygen functional groups on the partially reduced crumpled graphene oxide (r-CGO) for electrochemical energy storage applications. To effectively utilize the surface redox reactions of the functional groups, hierarchical networks of electrodes including r-CGO and functionalized few-walled carbon nanotubes (f-FWNTs) are assembled via a vacuum-filtration process, resulting in a 3D porous structure. These composite electrodes are employed as positive electrodes in Li-cells, delivering high gravimetric capacities of up to ∼170 mA h g-1 with significantly enhanced rate-capability compared to the electrodes consisting of conventional 2D reduced graphene oxide and f-FWNTs. These results highlight the importance of microstructure design coupled with oxygen chemistry control, to maximize the surface redox reactions on functionalized graphene based electrodes.

    Original languageEnglish
    Pages (from-to)12330-12338
    Number of pages9
    JournalNanoscale
    Volume8
    Issue number24
    DOIs
    Publication statusPublished - 2016 Jun 28

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    ASJC Scopus subject areas

    • Materials Science(all)

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