Hierarchical NiCoO@CuS composite electrode with enhanced surface area for high-performance hybrid supercapacitors
Hierarchical binder-free NiCo 2 O 4 @CuS composite electrodes have been successfully fabricated on a nickel foam surface using a facile hydrothermal method and directly used as a battery-type electrode material for supercapacitor applications. The surface morphological studies reveal that the compos...
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Veröffentlicht in: | RSC advances 2024-12, Vol.14 (54), p.487-497 |
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Zusammenfassung: | Hierarchical binder-free NiCo
2
O
4
@CuS composite electrodes have been successfully fabricated on a nickel foam surface using a facile hydrothermal method and directly used as a battery-type electrode material for supercapacitor applications. The surface morphological studies reveal that the composite electrode exhibited porous NiCo
2
O
4
nanograss-like structures with CuS nanostructures. The surface area of the composite is significantly enhanced (91.38 m
2
g
−1
) compared to NiCo
2
O
4
(52.16 m
2
g
−1
), with a predominant pore size of 3-6 nm. This synergistic combination enhanced the electrode's electrochemical properties. The NiCo
2
O
4
@CuS electrode delivered an impressive specific capacitance of 141.13 mA h g
−1
at 1 A g
−1
, surpassing the performance of the bare NiCo
2
O
4
electrode. The composite electrode also exhibited excellent rate capability and cycling stability, retaining 87.49% of its initial capacity at high current densities and 88.62% after 3000 cycles. A hybrid supercapacitor (HSC) device assembled using NiCo
2
O
4
@CuS and G-ink electrodes attained a peak energy density of 28.85 W h kg
−1
at a power density of 238.2 W kg
−1
, outperforming many reported HSCs. Additionally, the HSC device demonstrated exceptional cycling stability, retaining 87.59% of its initial capacitance after 4000 cycles. The superior performance of the NiCo
2
O
4
@CuS composite electrode is attributed to the synergistic combination of NiCo
2
O
4
and CuS, which promotes interfacial electron separation and facilitates rapid electron transfer.
Hierarchical NiCo
2
O
4
@CuS composite electrodes, synthesized
via
a hydrothermal method, exhibit superior electrochemical performance as battery-type electrode materials for supercapacitors, outperforming bare NiCo
2
O
4
. |
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ISSN: | 2046-2069 |
DOI: | 10.1039/d4ra07808j |