Hexagonal WO3 nanorods as ambipolar electrode material in asymmetric WO3//WO3/MnO2 supercapacitor

Sarkar, D and Mukherjee, S and Pal, S and Sarma, DD and Shukla, A (2018) Hexagonal WO3 nanorods as ambipolar electrode material in asymmetric WO3//WO3/MnO2 supercapacitor. In: Journal of the Electrochemical Society, 165 (10). A2108-A2114.

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Abstract

Unique efficacy of hexagonal WO3 (h-WO3) nanorods (NRs) both as anode and cathode materials realized via a core-shell design for constructing an asymmetric supercapacitor (ASC) with compelling performances is demonstrated. The WO3/MnO2 core-shell NR cathode designed by combining ultra-thin MnO2 nano-flake shell with h-WO3 NR core shows ameliorated electrochemical performance in terms of areal capacitance and rate capability in relation to pristine MnO2 electrodes. The study also elucidates the high charge storage capacity of h-WO3 NRs anode with contributions arising both from redox pseudocapacitance and intercalation capacitance due to proton intercalation/deintercalation inside the intracrystalline tunnels in h-WO3. Accordingly, the WO3//WO3/MnO2 ASC exhibits stable capacitance within a potential window of 1.8 V in an aqueous electrolyte with a volumetric capacitance of 7.22 F/cm3 and an energy density of 3.25 mWh/cm3, characterizing it as one of the state-of-the-art ASCs in the present scenario. The use of versatile h-WO3 NRs in designing both the negative and positive electrodes could be critical in realizing next-generation high-performance supercapacitors.

Item Type:	Journal Article
Publication:	Journal of the Electrochemical Society
Publisher:	Electrochemical Society Inc.
Additional Information:	The copyright for this article belongs to the Electrochemical Society Inc.
Keywords:	Anodes; Capacitance; Cathodes; Electrochemical electrodes; Electrolytes; Manganese oxide; Nanorods; Shells (structures); Supercapacitor, Aqueous electrolyte; Asymmetric supercapacitor; Cath-ode materials; Electrochemical performance; Intercalation capacitance; Positive electrodes; Proton intercalations; Volumetric capacitance, Tungsten compounds
Department/Centre:	Division of Chemical Sciences > Solid State & Structural Chemistry Unit
Date Deposited:	19 Aug 2022 06:04
Last Modified:	19 Aug 2022 06:04
URI:	https://eprints.iisc.ac.in/id/eprint/76008

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