Three-dimensionally assembled manganese oxide ultrathin nanowires: Prospective electrode material for asymmetric supercapacitors

Gunendra Prasad Ojha, Bishweshwar Pant, Alagan Muthurasu, Su-Hyeong Chae, Soo-Jin Park, Taewoo Kim and Hak-Yong Kim

Energy, 2019, vol. 188, issue C

Abstract: In this report, we have forwarded a noble synthesis route for the fabrication of self-supported three-dimensional networks of manganese oxide ultrathin nanowires (3D MnO2-UTNWs) via a simple and cost-effective process for the first time. The formation of ultrathin nanowires (5 nm in diameter with several micrometer lengths) and their 3D assembly was achieved via a slow-reduction of potassium permanganate by oleylamine under constant stirring at 80 °C for 50 h. The resultant material was characterized using FE-SEM, TEM, XRD, FTIR, BET, XPS and Raman techniques. As-fabricated 3D MnO2-UTNWs network was used as the electrode material for supercapacitor. The electrochemical studies of the material revealed an excellent electrochemical performance with a high specific capacitance of 544.7 Fg-1 at 1 Ag-1 and excellent life span of 86.3% after 5000 cycles. An asymmetric supercapacitor was assembled using 3D-MnO2 UTNWs and nitrogen-doped graphene hydrogels (NGHs) as the positive and negative electrodes; respectively. The 3D-MnO2 UTNWs//NGHs device delivered an admirable specific capacitance of 56.5 Fg-1 at 1 Ag-1, energy density of 21 Whkg−1 at 840 Wkg-1, and extraordinary cyclic stability of 81.3% after 5000 cycles. This method provides a novel green synthetic route to prepare 3D MnO2-UTNWs without utilizing non-ambient reaction parameters.

Keywords: MnO2 nanowires; 3D assembly; Oleylamine; Supercapacitor (search for similar items in EconPapers)
Date: 2019
References: View complete reference list from CitEc
Citations: View citations in EconPapers (5)

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Persistent link: https://EconPapers.repec.org/RePEc:eee:energy:v:188:y:2019:i:c:s036054421931761x

DOI: 10.1016/j.energy.2019.116066

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