Vanadomanganate as a synergistic component in high-performance symmetric supercapacitor

Maity, Sukanya and Vannathan, Anjana Anandan and Shee, Debaprasad and et al, . (2022) Vanadomanganate as a synergistic component in high-performance symmetric supercapacitor. Journal of Alloys and Compounds, 899. pp. 1-11. ISSN 0925-8388

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Abstract

Supercapacitor devices fabricated from capacitive and battery-type hybrid electrodes have been projected as a promising energy storage system because of their ability to produce high specific power and energy simultaneously. In this work, we have demonstrated a facile method of impregnation of faradaic type manganese (III) polyoxovanadate, [MnV14O40]−6 on the high surface area substrate of activated carbon (AC) as well as graphene oxide (GO). Materials and electrochemical characterizations data confirm the successful incorporation of capacitive and faradaic type manganese (III) polyoxovanadate into the nanohybrid electrode material. Furthermore, the synergic effect between the carbonaceous nanostructures (AC/GO) and redox-active oxometalate (MnV14) provides a better pathway for ion transport to the interface resulting in enhancement of the conductivity, diffusion ability of the nanohybrid. Moreover, the battery-type MnV14 clusters disperse in the micro/mesopores of AC, whereas the oxygen-containing functional groups in GO act as active sites for anchoring of MnV14 clusters. Thus, the surface modification with MnV14 clusters enhances the specific capacitance of nanohybrid with remarkable electrical and mechanical stability. The AC/MnV14 nanohybrid exhibits an enhanced specific capacitance of 547 F g−1 with specific energy and power of 76 Wh kg−1 and 1600 W kg−1, respectively, at 0.8 A g−1 current density. Additionally, GO/MnV14 shows a specific capacitance of 330 F g−1 with improved specific energy and power of 30 Wh kg−1 and 1276 W kg−1, respectively, at the same current density. Moreover, both the nanohybrids possess excellent cycle stability by retaining 92% (AC/MnV14) and 90.6% (GO/MnV14) of initial capacitance even after 5000 sweeping cycles. © 2021 Elsevier B.V.

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IITH Creators:

IITH Creators	ORCiD
Shee, Debaprasad	https://orcid.org/0000-0002-3503-8098

Item Type:

Article

Additional Information:

This work is supported by the Council of Scientific and Industrial Research under scheme 01/(2906)/17/EMR-II . S. M thanks to the National Institute of Technology Karnataka for financial assistance to carry out the research

Uncontrolled Keywords:

Activated carbon; Graphene oxide; Nanocomposite; Polyoxometalates; Symmetric supercapacitors

Subjects:

Physics
Chemistry
Chemical Engineering

Divisions:

Department of Chemical Engineering
Department of Chemistry
Department of Physics

Depositing User:

. LibTrainee 2021

Date Deposited:

02 Jul 2022 10:00

Last Modified:

13 Jul 2022 10:41