Facile synthesis of hierarchical NiCoP nanowires@NiCoP nanosheets core–shell nanoarrays for high-performance asymmetrical supercapacitor
Transition metal phosphides have been regarded as reliable supercapacitor electrode materials and extensively researched. In this work, a facile three-step way has been taken to synthesize NiCoP@NiCoP core–shell nanoarrays directly grown on carbon cloth, which was used as a high-performance supercap...
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Veröffentlicht in: | Journal of materials science 2020, Vol.55 (3), p.1157-1169 |
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Format: | Artikel |
Sprache: | eng |
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Zusammenfassung: | Transition metal phosphides have been regarded as reliable supercapacitor electrode materials and extensively researched. In this work, a facile three-step way has been taken to synthesize NiCoP@NiCoP core–shell nanoarrays directly grown on carbon cloth, which was used as a high-performance supercapacitor electrode. Compared with the NiCo-LDH precursor and NiCoP nanowire and NiCoP nanosheet, NiCoP@NiCoP core–shell composite shows higher electrochemical performance owing to the integration of the advantages of phosphides and core–shell structure. To be specific, the as-fabricated NiCoP C–S electrode exhibits great electrochemical performance with high specific capacitance (1492.5 F g
−1
at 1 A g
−1
), good rate performance (68.82% of the initial specific capacitance at 15 A g
−1
) and outstanding cycling stability (maintains 80.9% of the initial capacitances after 5000 cycles at 10 A g
−1
). Moreover, the assembled NiCoP C–S//rGO asymmetric supercapacitor device delivers a high energy density of 48.13 Wh kg
−1
at the power density of 1125 W kg
−1
and it still retains 20.94 Wh kg
−1
at a high power density of 11250 W kg
−1
, indicating its great possibility of practical application. |
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ISSN: | 0022-2461 1573-4803 |
DOI: | 10.1007/s10853-019-04011-8 |