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In-situ grown nickel selenide onto graphene nanohybrid electrodes for high energy density asymmetric supercapacitors

Abstract

Nickel selenide (NiSe) nanoparticles uniformly supported onto graphene nanosheets (G) to form NiSe-G nanohybrids were prepared by an in-situ hydrothermal process. The uniform distribution of NiSe onto graphene bestowed the NiSe-G nanohybrid with faster charge transport and diffusion along with the abundant accessible electrochemical active sites. The synergistic effect between NiSe nanoparticles and graphene nanosheets for supercapacitor applications was systematically investigated for the first time. The freestanding NiSe-G nanohybrid electrode exhibited better electrochemical performance with a high specific capacitance of 1280 F g-1 at a current density of 1 A g-1 with excellent cycling stability and the capacitance retention of 98% after 2500 cycles than that of NiSe nanoparticles. Furthermore, an asymmetric supercapacitor device assembled using NiSe-G nanohybrid as the positive electrode, activated carbon as the negative electrode and electrospun PVdF membrane containing 6 M KOH as the separator as well as electrolyte delivered a high-energy density of 50.1 Wh kg-1 with a power density of 816 W kg-1 in an extended operating voltage of 1.6 V. Thus, the NiSe-G nanohybrid can be used as a potential electrode material for high-performance supercapacitor.

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Publication details

The article was received on 06 Aug 2018, accepted on 01 Oct 2018 and first published on 01 Oct 2018


Article type: Paper
DOI: 10.1039/C8NR06345A
Citation: Nanoscale, 2018, Accepted Manuscript
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    In-situ grown nickel selenide onto graphene nanohybrid electrodes for high energy density asymmetric supercapacitors

    B. Kirubasankar, V. Murugadoss, J. Lin, M. Dong, J. Zhang, T. Li, N. Wang, Z. Guo, T. Ding, H. Liu and S. Angaiah, Nanoscale, 2018, Accepted Manuscript , DOI: 10.1039/C8NR06345A

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