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Selective integration of hierarchical nanostructured energy materials: An effective approach to boost energy storage performance of flexible hybrid supercapacitor

Abstract

High energy density, fast charge-discharge capability, high flexibility, and sustained cycle life are the main key challenges for flexible supercapacitors (SCs) in modern electronics. These primary requirements could be accomplished by engineering a new class of current collector consisting hierarchical combination of various active materials. Here, this study reports the selective integration of hierarchical Ni(OH)2 nanoneedle arrays with NiO-NiCo2O4 nanosheet arrays (Ni(OH)2 NNAs@NiO-NiCo2O4 NSAs) on flexible fabric for high-performance electrodes. The novel core-shell-like hetero-nanoarchitectures not only enhance the electrochemical activity and specific surface area but also, more importantly, provide superhighway for the ultrafast transport of electrons and ions. As a battery-type material, the core-shell-like Ni(OH)2 NNAs@NiO-NiCo2O4 NSAs displays the high specific capacity of 326.7 mA h g-1 at 2 A g-1 in aqueous 3 M KOH, and it is 1.89, 1.23 and 1.14 times superior than NiO-NiCo2O4, NiO@NiO-NiCo2O4 and Co3O4@NiO-NiCo2O4 electrodes. Most importantly, a flexible hybrid SC (FHSC, Ni(OH)2 NNAs@NiO-NiCo2O4 NSAs//Graphene-ink) demonstrates a superhigh energy density of 97.1 W h kg-1 and superior long cycling lifespan of 94.7% retention over 5000 cycles. Utilizing such an excellent energy storage property, the fabricated FHSC operated the multifunction electronic display and light up different colored light emitting diodes for real-time applications.

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Publication details

The article was received on 29 Dec 2018, accepted on 13 Feb 2019 and first published on 13 Feb 2019


Article type: Paper
DOI: 10.1039/C8TA12508B
Citation: J. Mater. Chem. A, 2019, Accepted Manuscript

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    Selective integration of hierarchical nanostructured energy materials: An effective approach to boost energy storage performance of flexible hybrid supercapacitor

    C. V. V. Muralee Gopi, P. J. S. Rana, P. Rapur, R. Vinodh and H. Kim, J. Mater. Chem. A, 2019, Accepted Manuscript , DOI: 10.1039/C8TA12508B

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