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Ultrathin nanosheet interconnected NiS/Ni(OH) hybrid nanocages: successive self-sacrifice template fabrication and exceptional performance in supercapacitors

Journal of Materials Chemistry C, ISSN: 2050-7534, Vol: 10, Issue: 16, Page: 6263-6270
2022
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Low-cost and highly electroactive nickel-based materials are important electrodes for the development of supercapacitors. The precise modulation of the morphology and microstructure has been a crucial measure to further enhance the electrochemical performance. Herein, a three-dimensional porous nanocage NiS/Ni(OH) hybrid formed by NiS nanoparticles anchored on Ni(OH) nanoflakes was creatively synthesized via a simple and scalable approach, which was based on two-time ion exchange reactions of the Mg(OH) precursor. Significantly, in asymmetric supercapacitors, the NiS/Ni(OH) hybrid exhibits a high specific capacitance of 2726 F g at a current density of 1 A g and an excellent energy density of 31.31 Wh kg at a power density of 62.56 W kg, which are superior to those of the currently reported nickel sulfide electrode materials. Compared with the nanoflower-like Mg(OH) and Ni(OH) precursors, the NiS/Ni(OH) hybrid possesses hollow, abundant porous morphology and better electrical conductivity, which could provide a large contact surface area, shorter ion diffusion path and excellent charge transport, resulting in a dramatic improvement in electrochemical performance, making the NiS/Ni(OH) hybrid a superb cathode material for supercapacitors.

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