Iron-cobalt-nickel-copper-zinc (FeCoNiCuZn) high entropy alloy as positive electrode for high specific capacitance supercapacitor

Mohanty, GC and Chowde Gowda, C and Gakhad, P and Das, S and Sanjay, M and Chowdhury, S and Biswas, K and Singh, A and Tiwary, CS (2023) Iron-cobalt-nickel-copper-zinc (FeCoNiCuZn) high entropy alloy as positive electrode for high specific capacitance supercapacitor. In: Electrochimica Acta, 470 .

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Abstract

High entropy alloys (HEAs) are new-generation supercapacitive materials providing multiple active sites for enhanced electrochemical redox reactions. In this regard, we have successfully synthesized HEA comprising of Iron-Cobalt-Nickel-Copper-Zinc (Fe-Co-Ni-Cu-Zn) using induction melting and reduced its dimensions via ball milling. The ball-milled Fe-Co-Ni-Cu-Zn sample is throughly characterized by using basic structural and morphological techniques. A positive electrode is fabricated for supercapacitor application. This quinary HEA shows the highest gravimetric capacitance of 325.17 F g − 1 at 1 A g − 1 (3 M potassium hydroxide, aqueous electrolyte) in single electrode system. The asymmetric device also demonstrates energy density of 23.82 Wh kg−1 by consuming a power density of 325 W kg−1. Additionally, theoretical studies (DFT) shows that the electronic distribution of quinary Fe-Co-Ni-Cu-Zn elements in the alloy enhances chemical stability which is the reason for higher specific capacitance. © 2023 Elsevier Ltd

Item Type:	Journal Article
Publication:	Electrochimica Acta
Publisher:	Elsevier Ltd
Additional Information:	The copyright for this article belongs to the Elsevier Ltd.
Keywords:	Ball milling; Chemical stability; Cobalt; Cobalt alloys; Copper alloys; Electrochemical electrodes; Electrolytes; Entropy; High-entropy alloys; Nickel; Potassium hydroxide; Redox reactions; Supercapacitor; Zinc alloys, Active site; And asymmetric device; Cobalt-nickel-copper; Electrochemical redox reactions; High entropy alloy; High entropy alloys; High specific capacitances; Iron-cobalt; Iron-cobalt-nickel-copper-zinc (feconicuzn); Positive electrodes, Iron alloys
Department/Centre:	Division of Chemical Sciences > Materials Research Centre
Date Deposited:	12 Dec 2023 03:36
Last Modified:	12 Dec 2023 03:36
URI:	https://eprints.iisc.ac.in/id/eprint/83343

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