Formation of nickel-cobalt sulphide@graphene composites with enhanced electrochemical capacitive properties

Here, nickel-cobalt sulphide particles embedded in graphene layers (porous Ni-Co-S@G), were successfully prepared by one-step annealing of metallocene/metal-organic framework (MOF) hybrids involving simultaneous carbonization and sulfidation. Benefiting from the porous structure, highly conductive g...

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Veröffentlicht in:RSC advances 2019-02, Vol.9 (12), p.6946-6955
Hauptverfasser: Qiu, Junjie, Bai, Zhongxiong, Liu, Shucheng, Liu, Yi
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Sprache:eng
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Zusammenfassung:Here, nickel-cobalt sulphide particles embedded in graphene layers (porous Ni-Co-S@G), were successfully prepared by one-step annealing of metallocene/metal-organic framework (MOF) hybrids involving simultaneous carbonization and sulfidation. Benefiting from the porous structure, highly conductive graphene layers and large loading of super-capacitive Ni-Co-S, the obtained Ni-Co-S@G composites exhibited excellent electrochemical performance with a specific capacitance of 1463 F g −1 at a current density of 1 A g −1 . A flexible solid-state asymmetric supercapacitor (ASC), assembled with Ni-Co-S@G and active carbon, demonstrated a high energy density of 51.0 W h kg −1 at a power density of 650.3 W kg −1 . It is noteworthy that the ASC offered robust flexibility and excellent performance that was maintained when the devices were bent at various angles. The results indicate that the as-prepared materials could potentially be applied in high-performance electrochemical capacitors. Ni-Co-S@graphene composites, derived from a metallocene/MOF precursor, presents high energy density and excellent cycling stability.
ISSN:2046-2069
2046-2069
DOI:10.1039/c8ra06906a