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Engineering rhynchostylis retusa-like heterostructured α-nickel molybdate with enhanced redox properties for high-performance rechargeable asymmetric supercapacitors

Abstract

The demand for battery-type materials having hierarchical architectures, large surface areas, and excellent redox properties, to develop high-energy density asymmetric supercapacitors (ASCs), is increasing. Herein, a facile single-step wet chemical method is proposed, which allows the engineered combination of α-NiMoO4 hierarchical heterostructures usable as advanced battery-type electrodes for ASCs. The as-synthesized architectures consist of versatile nanogeometries including nanowires, nanosheets, and nanoparticles in the form of Rhynchostylis retusa-like heterostructures, which synergistically enhance the energy storage properties; specifically, at a current density of 2 A g–1, heterostructured α-NiMoO4 exhibits a superior specific capacitance of 1061 F g–1 and an outstanding cycling stability of 96%. Moreover, an aqueous ASC is fabricated by combining such a redox-type α-NiMoO4 heterostructure and activated porous carbon as the positive and negative electrodes, respectively, separated with a filter paper. This device shows high energy and power densities (31.8 Wh kg–1 and 786.5 W kg–1, respectively), which are useful to operate various portable electronic appliances. Together with the excellent cycling stability and energy storage properties, the synthesized heterostructured metal molybdates exemplifies a new approach to develop novel electrode materials for high-performance aqueous ASCs.

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Publication details

The article was received on 07 Aug 2019, accepted on 05 Nov 2019 and first published on 05 Nov 2019


Article type: Paper
DOI: 10.1039/C9TA08634J
J. Mater. Chem. A, 2019, Accepted Manuscript

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    Engineering rhynchostylis retusa-like heterostructured α-nickel molybdate with enhanced redox properties for high-performance rechargeable asymmetric supercapacitors

    G. S. R. Raju, E. Pavitra, G. Nagaraju, N. R. Chodankar, S. K. Vishwanath, J. Y. Park, Y. S. Huh and Y. Han, J. Mater. Chem. A, 2019, Accepted Manuscript , DOI: 10.1039/C9TA08634J

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