Supercapacitors with Prussian Blue Derived Carbon Encapsulated Fe/Fe3C Nanocomposites

Kumar, A and Das, D and Sarkar, D and Patil, S and Shukla, A (2020) Supercapacitors with Prussian Blue Derived Carbon Encapsulated Fe/Fe3C Nanocomposites. In: Journal of the Electrochemical Society, 167 (6).

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Abstract

A one-step synthesis of carbon encapsulated Fe/Fe3C nanoparticles by pyrolyzing single source precursor of Prussian Blue (Iron (III) ferrocyanide) for its usage as anode material in high-performance supercapacitors is reported. The synthetic method produces 3D doughnut shaped porous structures comprising numerous interconnected Fe/Fe3C nanoparticles entirely encapsulated within layers of graphitic carbon. Such a porous structure facilitates electrolytic ion diffusion during charge storage on Fe/Fe3C nanoparticles through surface or near surface-based faradaic reactions, while the metallic iron helps enhancing the electronic conductivity of the electroactive material. Accordingly, the charge storage in such carbon encapsulated Fe/Fe3C nanoparticles is governed by capacitive as well as diffusion-controlled processes at lower scan rates, and is taken over by capacitive processes at higher scan rates. The material achieves a specific capacitance of 223 F g-1 at a scan rate of 10 mV s-1 along with compelling cycling performance exhibiting a little decay in capacitance over 20,000 cycles. When coupled with activated-carbon cathode, Fe/Fe3C//activated-carbon asymmetric supercapacitor out-performs many recently reported supercapacitors. © 2020 The Electrochemical Society ("ECS"). Published on behalf of ECS by IOP Publishing Limited.

Item Type:	Journal Article
Publication:	Journal of the Electrochemical Society
Publisher:	Institute of Physics Publishing
Additional Information:	Copy right for this article belongs to Institute of Physics Publishing
Keywords:	Activated carbon; Anodes; Capacitance; Nanoparticles; Porosity; Supercapacitor; Surface reactions; Synthesis (chemical), Asymmetric supercapacitor; Carbon-encapsulated; Cycling performance; Diffusion-controlled process; Electroactive material; Electronic conductivity; Single-source precursor; Specific capacitance, Iron compounds
Department/Centre:	Division of Chemical Sciences > Materials Research Centre Division of Chemical Sciences > Solid State & Structural Chemistry Unit
Date Deposited:	19 Nov 2020 11:45
Last Modified:	19 Nov 2020 11:45
URI:	http://eprints.iisc.ac.in/id/eprint/65629

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