Mohanty, GC and Gowda, CC and Gakhad, P and Sanjay, M and Sarkar, S and Biswas, K and Singh, A and Tiwary, CS (2023) High energy density liquid state asymmetric supercapacitor devices using Co-Cr-Ni-Fe-Mn high entropy alloy. In: Materials Advances, 4 (17). 3839 -3852.
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Abstract
For satisfying the ever-growing need in novel material search for energy storage applications, high entropy alloys (HEAs) have been explored recently. A simple induction melting method was used to synthesize the CoCrNiFeMn bulk HEA sample that was later ball-milled to obtain nanoparticles. The dimension reduction provided an increased surface area for sample usage in supercapacitor applications. The highest specific capacitance of 386.66 F g−1 was obtained at 5 mV s−1 in an aqueous 3 M KOH electrolyte in a three-electrode system. We also studied the contribution of d-band electrons from the metals for electrochemical interaction in the system through DFT calculations. The liquid state CoCrNiFeMn//activated carbon (AC) asymmetric supercapacitor (ASC) device was fabricated, and the energy stored was used to glow a 1.5 V LED device. The energy density of the ASC device was 21 W h kg−1 at a power density of 307 W kg−1, which is one of the first reports on HEA-based liquid-state asymmetric devices.
| Item Type: | Journal Article |
|---|---|
| Publication: | Materials Advances |
| Publisher: | Royal Society of Chemistry |
| Additional Information: | The copyright for this article belongs to the Authors. |
| Department/Centre: | Division of Chemical Sciences > Materials Research Centre |
| Date Deposited: | 04 Nov 2023 03:56 |
| Last Modified: | 04 Nov 2023 03:56 |
| URI: | https://eprints.iisc.ac.in/id/eprint/83164 |
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