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Enhanced energy density of high entropy alloy (Fe-Co-Ni-Cu-Mn) and green graphene hybrid supercapacitor
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  • Gobinda Chandra Mohanty,
  • Chinmayee Chowde Gowda,
  • Pooja Gakhad,
  • Anu Verma,
  • Shubhasikha Das,
  • Shamik Chowdhary,
  • Jayanta Bhattacharya,
  • Abhishek Singh,
  • Koushik Biswas,
  • Chandra Sekhar Tiwary
Gobinda Chandra Mohanty
Indian Institute of Technology Kharagpur School of Nano Science and Technology
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Chinmayee Chowde Gowda
Indian Institute of Technology Kharagpur School of Nano Science and Technology
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Pooja Gakhad
Indian Institute of Science Materials Research Centre
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Anu Verma
Indian Institute of Technology Kharagpur School of Environmental Science and Engineering
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Shubhasikha Das
Indian Institute of Technology Kharagpur School of Environmental Science and Engineering
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Shamik Chowdhary
Indian Institute of Technology Kharagpur School of Environmental Science and Engineering
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Jayanta Bhattacharya
Indian Institute of Technology Kharagpur School of Environmental Science and Engineering
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Abhishek Singh
Indian Institute of Science Materials Research Centre
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Koushik Biswas
Indian Institute of Technology Kharagpur School of Nano Science and Technology
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Chandra Sekhar Tiwary
Indian Institute of Technology Kharagpur School of Nano Science and Technology

Corresponding Author:chandra.tiwary@metal.iitkgp.ac.in

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Abstract

Given the growing demand for new materials for supercapacitor applications, high entropy alloys (HEAs) are being extensively investigated. They are an efficient alternative to existing energy sources due to their synergistic contribution from individual element. We demonstrate the development of nanostructured HEA (FeCoNiCuMn) as a cathode material with specific capacitance (C s) of ~388 F g -1 (5 mV s -1). As anode material, green graphene (rice straw biochar) synthesized using pyrolysis shows a maximum C s of ~560 F g -1 at similar scan rate (5 mV s -1). A hybrid asymmetric liquid state device was assembled using the FeCoNiCuMn nanostructured HEA and green graphene as electrodes. Utilizing the green source, the device provided a high C s of 83.22 F g -1 at 2 A g -1. The specific energy of the device was 33.4 Wh kg -1 and specific power of 1.7 kW kg -1. The electrochemical behavior of each element in the high entropy composition was studied through post X-ray photoelectron spectroscopy and scanning electron microscopic analysis. The chemical behavior of FeCoNiCuMn is further investigated using DFT studies. The enhanced electrochemical properties and synergistic contribution of each element of the HEA is studied via of d-band theory. The current work can be utilized to develop asymmetric hybrid supercapacitors as environmental friendly energy source.
Submitted to Energy Storage
28 Mar 2024Review(s) Completed, Editorial Evaluation Pending
28 Mar 2024Submission Checks Completed
28 Mar 2024Assigned to Editor
09 Apr 2024Reviewer(s) Assigned
19 May 2024Editorial Decision: Accept