α-Fe2O3-Based Core-Shell-Nanorod–Structured Positiveand Negative Electrodes for a High-Performance α-Fe2O3/C//α-Fe2O3/MnOxAsymmetric Supercapacitor

Sarkar, Debasish and Pal, Somnath and Mandal, Suman and Shukla, Ashok and Sarma, DD (2017) α-Fe2O3-Based Core-Shell-Nanorod–Structured Positiveand Negative Electrodes for a High-Performance α-Fe2O3/C//α-Fe2O3/MnOxAsymmetric Supercapacitor. In: Journal of The Electrochemical Society, 164 (12). A2707-A2715. ISSN 0013-4651

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Abstract

A α-Fe2O3/MnOx core-shell nanorod (NR)-based positive electrode is designed combining the traits of α-Fe2O3 and MnOx with an ultrathin MnOx shell serving as active site for surface or near-surface based fast and reversible faradaic-reactions and α-Fe2O3 NR core facilitating electron transfer toward the current collector. The α-Fe2O3/MnOx core-shell NR electrode shows ameliorated electrochemical performance in terms of capacitance and rate capability within the potential window of 0–1 V in relation to both pristine α-Fe2O3 NR electrode and pristine MnOx thin film electrode. Similarly, α-Fe2O3/C core-shell NR negative electrode is also realized. The assembled α-Fe2O3/C//α-Fe2O3/MnOx core-shell NR asymmetric supercapacitor (ASC) exhibits a volumetric capacitance of ∼ 1.28 F/cm3 at a scan rate of 10 mV/s with nearly 78% capacitance retention at the scan rate of 400 mV/s within a potential window of 0–2 V in aqueous electrolyte medium. Interestingly, the ASC delivers a maximum energy-density of ∼ 0.64 mWh/cm3 and a maximum power-density of 155 mW/cm3, which are higher than the values obtained for α-Fe2O3 //α-Fe2O3/MnOx core-shell NR ASC. Thus the study clearly exhibits the potency of core-shell nano-architechtured electrode design in realizing high-performance, cost-effective and environment-friendly ASCs.

Item Type:	Journal Article
Publication:	Journal of The Electrochemical Society
Publisher:	Electrochemical Society Inc.
Additional Information:	The Copyright of this article belongs to the Electrochemical Society Inc.
Keywords:	Capacitance; Cost effectiveness; Electrochemical electrodes; Electrodes; Electrolytes; Manganese compounds; Nanorods; Shells (structures); Supercapacitor; Aqueous electrolyte; Asymmetric supercapacitor; Capacitance retention; Electrochemical performance; Environment friendly; Maximum power density; Thin-film electrode; Volumetric capacitance; Iron compounds
Department/Centre:	Division of Chemical Sciences > Solid State & Structural Chemistry Unit
Date Deposited:	24 Jun 2022 06:34
Last Modified:	24 Jun 2022 06:34
URI:	https://eprints.iisc.ac.in/id/eprint/73492

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