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Flexible All-solid-state Ultrahigh-energy Asymmetric Supercapacitors Based on Tailored Morphology of NiCoO2/Ni(OH)2/Co(OH)2 Electrodes

Abstract

One of the important requirements of energy storage devices is to store more energy per space. In this paper a novel strategy is explored to design and fabricate the high-energy supercapacitors by enhancing the areal capacity of electrode based on the tailored morphology. The morphology of fabricated samples changed from 3D dense bulk and 2D agglomerated thick sheet to interconnected thin nanosheet networks with ordered nano-holes, and a new phase of NiCoO2 was simultaneously produced. And 3D interconnected NiCoO2/Ni(OH)2/Co(OH)2 nanosheets network was used as an electrode, high volumetric capacity of 420 C cm-3 was obtained at current density of 14.7 mA cm-2 and 294 C cm-3 of capacity retained at a current density of 100 mA cm-2. And the reason for the improvement of the electrochemical properties has also been discussed. Besides, an energy density of 37.41 mWh cm-3 with a power density of 155 mW cm-3 in an aqueous asymmetric supercapacitor has been achieved; An energy density of 11.98 mWh cm-3 with a power density of 77 mW cm-3 has also been demonstrated in an all-solid-state asymmetric supercapacitor, with an excellent cycling stability and outstanding flexibility. The fabricated all-solid-state supercapacitors are further tested in a heart-shaped logo to supply power for ~1 hour, indicating a promising applications of these supercapacitors. This strategy provides new opportunities for the fabrication of electrode and device with high energy and power density.

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Publication details

The article was received on 17 Aug 2018, accepted on 06 Sep 2018 and first published on 06 Sep 2018


Article type: Paper
DOI: 10.1039/C8CE01385C
Citation: CrystEngComm, 2018, Accepted Manuscript
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    Flexible All-solid-state Ultrahigh-energy Asymmetric Supercapacitors Based on Tailored Morphology of NiCoO2/Ni(OH)2/Co(OH)2 Electrodes

    T. Qin, H. Li, R. Ren, S. Peng, J. Hao, Y. Wen, Z. Wang, J. Huang, D. He and G. Cao, CrystEngComm, 2018, Accepted Manuscript , DOI: 10.1039/C8CE01385C

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