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Ultra-high energy density flexible asymmetric supercapacitor based on hierarchical fabric decorated with 2D bimetallic oxide nanosheets and MOF derived porous carbon polyhedrons

Abstract

Flexible supercapacitors (SCs) are an emergent and auspicious technology for next-generation energy storage devices, however, the low energy densities hindered their practical applications. Two dimensional (2D) nanosheets can exhibit excellent electrochemical charge storage properties due to their short ion-diffusion distance and rich electroactive sites with multiple valence states. Herein, we report the direct growth of mesoporous 2D zinc cobaltite nanosheets on a flexible carbon cloth substrate (Zn-Co-O@CC) with an average thickness of ~ 45 nm by the facile hydrothermal method at low temperature. The Zn-Co-O@CC can be realized as a binder-free electrode for high-performance SC. Zn-Co-O@CC electrode displays a high capacitance of 1750 Fg-1 at 1.0 Ag-1 with excellent rate capability of 61 % at 20 Ag-1 and also demonstrates good cycling stability (95.64 %) up to 5000 cycles in aqueous electrolyte. Moreover, highly flexible asymmetric supercapacitor (ASC) devices have been fabricated using Zn-Co-O@CC as a positive electrode and bimetallic organic framework (MOF) derived nanoporous carbon polyhedrons (NPC@CC) as a negative electrode (Zn-Co-O@CC//NPC@CC). The as-fabricated ASC can operate at large potential window of 0.0-2.0 V and shows outstanding energy storage performance by delivering an ultra-high energy density of 117.92 Wh kg-1 at a power density of 1490.4 W kg-1 with cycling stability of 94 % after 5000 charge/discharge cycles. According to the best of our knowledge, the achieved energy storage performance of ASC device is very competitive and highest as compared with all binary metal oxides, carbonaceous materials, and MXenes based SCs and ASCs to date. The applied strategy to fabricate the SC is capable to enhance both electrochemical activities as well as cycling stability and can be readily applied to other metal oxide based SCs.

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Publication details

The article was received on 11 Sep 2018, accepted on 03 Dec 2018 and first published on 03 Dec 2018


Article type: Communication
DOI: 10.1039/C8TA08816K
Citation: J. Mater. Chem. A, 2018, Accepted Manuscript
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    Ultra-high energy density flexible asymmetric supercapacitor based on hierarchical fabric decorated with 2D bimetallic oxide nanosheets and MOF derived porous carbon polyhedrons

    M. S. Javed, N. Shaheen, S. Hussain, J. Li, S. S. A. Shah, Y. Abbas, M. A. Ahmad, R. Raza and W. Mai, J. Mater. Chem. A, 2018, Accepted Manuscript , DOI: 10.1039/C8TA08816K

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