Mohanty, GC and Chowde Gowda, C and Gakhad, P and Verma, A and Das, S and Chowdhary, S and Bhattacharya, J and Singh, AK and Biswas, K and Tiwary, CS (2024) Enhanced energy density of high entropy alloy (Fe-Co-Ni-Cu-Mn) and green graphene hybrid supercapacitor. In: Energy Storage, 6 (4).
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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 (Cs) of ~388 F g�1 (5 mV s�1). As anode material, green graphene (rice straw biochar) synthesized using pyrolysis shows a maximum Cs 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 Cs 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 d-band theory. The current study can be utilized to develop asymmetric hybrid supercapacitors as environmental friendly energy source. © 2024 The Author(s). Energy Storage published by John Wiley & Sons Ltd.
| Item Type: | Journal Article |
|---|---|
| Publication: | Energy Storage |
| Publisher: | John Wiley and Sons Inc |
| Additional Information: | The copyright for this article belongs to Authors. |
| Keywords: | Anodes; Cathodes; Cobalt alloys; Copper alloys; Entropy; Graphene; High-entropy alloys; Iron alloys; Manganese alloys; Scanning electron microscopy; Supercapacitor, DFT analyse; Energy density; Energy source; Green graphene; Growing demand; High entropy alloys; Hybrid supercapacitors; Nano-structured; Supercapacitor application; XPS study, X ray photoelectron spectroscopy |
| Department/Centre: | Division of Chemical Sciences > Materials Research Centre |
| Date Deposited: | 04 Aug 2024 13:16 |
| Last Modified: | 04 Aug 2024 13:16 |
| URI: | http://eprints.iisc.ac.in/id/eprint/85713 |
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