Mg<sup>2+</sup> ion-powered hybrid supercapacitor with β-MnO<inf>2</inf> as a cathode and α-Fe<inf>2</inf>O<inf>3</inf> as an anode
Issued Date
2022-06-01
Resource Type
eISSN
2352152X
Scopus ID
2-s2.0-85128184761
Journal Title
Journal of Energy Storage
Volume
50
Rights Holder(s)
SCOPUS
Bibliographic Citation
Journal of Energy Storage Vol.50 (2022)
Suggested Citation
Shaikh N.S., Mali S.S., Patil J.V., Mujawar A.I., Shaikh J.S., Pathan S.C., Praserthdam S., Hong C.K., Kanjanaboos P. Mg<sup>2+</sup> ion-powered hybrid supercapacitor with β-MnO<inf>2</inf> as a cathode and α-Fe<inf>2</inf>O<inf>3</inf> as an anode. Journal of Energy Storage Vol.50 (2022). doi:10.1016/j.est.2022.104525 Retrieved from: https://repository.li.mahidol.ac.th/handle/20.500.14594/84556
Title
Mg<sup>2+</sup> ion-powered hybrid supercapacitor with β-MnO<inf>2</inf> as a cathode and α-Fe<inf>2</inf>O<inf>3</inf> as an anode
Other Contributor(s)
Abstract
Commercial electrochemical supercapacitors are expensive, toxic, and have inadequate energy density at a high power density. To overcome above complications, researchers are focusing on aqueous magnesium-ion-based supercapacitors via bivalent Mg2+ ions. Herein, the facile hydrothermal method was employed for the synthesis of the β-MnO2 and α-Fe2O3 electrodes, which are confirmed by X-ray diffraction (XRD) and X-ray photoelectron spectroscopic (XPS) techniques. We fabricated a Mg2+-based hybrid supercapacitor (Mg-HSC) with β-MnO2 as a cathode, α-Fe2O3 as an anode, and 1 M MgSO4 as an electrolyte; β-MnO2 exhibited a specific capacitance of 1867 F/g while α-Fe2O3 showed 1896 F/g. The good performance is attributed to small ions of Mg2+ and its bivalent nature. The Mg-HSC exhibited excellent specific capacitance of 230.0 F/g at 1 A/g current density in a wide voltage range of 0 to 1.7 V. The Mg-HSC showed 82.1 Wh/kg energy density at 6153.8 W/kg power density. Moreover, this configured device showed superior long-term cycling stability with capacitance retention of >96.2% over 5000 cycles at 15 A/g current density. The facile synthesis method of electrode materials and the bivalent MgSO4 yield into the high-performance hybrid supercapacitor which can compete with current electrochemical energy storage devices.