Engineering one-dimensional and two-dimensional birnessite manganese dioxides on nickel foam-supported cobalt-aluminum layered double hydroxides for advanced binder-free supercapacitors

Xiaodong Hao, Yuxin Zhang, Zengpeng Diao, Houwen Chen, Aiping Zhang, Zhongchang Wang

    Research output: Contribution to journalArticlepeer-review

    19 Citations (Scopus)

    Abstract

    We report a facile decoration of the hierarchical nickel foam-supported CoAl layered double hydroxides (CoAl LDHs) with MnO<inf>2</inf> nanowires and nanosheets by a chemical bath method and a hydrothermal approach for high-performance supercapacitors. We demonstrate that owing to the sophisticated configuration of binder-free LDH@MnO<inf>2</inf> on the conductive Ni foam (NF), the designed NF/LDH@MnO<inf>2</inf> nanowire composites exhibit a highly boosted specific capacitance of 1837.8 F g<sup>-1</sup> at a current density of 1 A g<sup>-1</sup>, a good rate capability, and an excellent cycling stability (91.8% retention after 5000 cycles). By applying the hierarchical NF/LDH@MnO<inf>2</inf> nanowires as the positive electrode and activated microwave exfoliated graphite oxide activated graphene as the negative electrode, the fabricated asymmetric supercapacitor produces an energy density of 34.2 Wh kg<sup>-1</sup> with a maximum power density of 9 kW kg<sup>-1</sup>. Such strategies with controllable assembly capability could open up a new and facile avenue in fabricating advanced binder-free energy storage electrodes. This journal is

    Original languageEnglish
    Pages (from-to)63901-63908
    Number of pages8
    JournalRSC Advances
    Volume4
    Issue number109
    DOIs
    Publication statusPublished - 2014

    ASJC Scopus subject areas

    • Chemical Engineering(all)
    • Chemistry(all)

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