Polyoxomolybdate–Polypyrrole–Graphene Oxide Nanohybrid Electrode for High-Power Symmetric Supercapacitors

Maity, Sukanya and JE, Madhusree and Biradar, Bhimaraya R. and Chandewar, Pranay R. and Shee, Debaprasad and et al, . (2021) Polyoxomolybdate–Polypyrrole–Graphene Oxide Nanohybrid Electrode for High-Power Symmetric Supercapacitors. Energy & Fuels, 35 (22). pp. 18824-18832. ISSN 0887-0624

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Supercapacitors have emerged as one of the most promising candidates for high-performance, safe, clean, and economical routes to store and release of nonfossil energy. Designing hybrid materials by integrating double-layer and pseudocapacitive materials is crucial to achieving high-power and high-energy storage devices simultaneously. Herein, we synthesized a polyoxomolybdate-polypyrrole-graphene oxide nanohybrid via a one-pot reaction. The inclusion of polypyrrole enables a uniform distribution of the polyoxomolybdate clusters; it also confines the restacking of graphene oxide nanosheets. The structural and morphological analysis to unveil the nanohybrid architecture implies excellent interfacial contact, enabling fast redox reaction of polyanions, and a quick transfer of charge to the interfaces. Electrochemical characteristics tested under a two-electrode system exhibit the highest capacitance of 354 F g-1 with significantly high specific energy and power of 49.16 Wh kg-1 and 999.86 W kg-1, respectively. In addition, the cell possesses a high-rate capability and long cycle life by maintaining 96% of its capacitance over 5000 sweeping cycles. The highest specific power of ∼10 »000 W kg-1 was computed with Coulombic efficiency of 92.30% at 5 A g-1 current density. Electrochemical impedance spectroscopy additionally reveals enhanced redox charge transfer due to double hybridization. Furthermore, it also demonstrates the impedance and capacitive behavior of supercapacitor cells over a definite frequency regime. ©

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IITH Creators:
IITH CreatorsORCiD
Shee, Debaprasadhttps://orcid.org/0000-0002-3503-8098
Item Type: Article
Additional Information: This work was funded by the Science and Engineering Research Board (SERB), DST, Government of India [EMR/2016/000808]; Vision Group on Science and Technology (VGST), Govt. of Karnataka [KSTePS/VGST-RGS-F/2018-19/GRD no. 827/315]; Vision Group on Science and 490 Technology (VGST), Govt. of Karnataka [KSTePS/VGSTRGS-F/2018-19/GRD no. 806/315]. S.M. and B.R.B. acknowledge financial support from the National Institute of Technology Karnataka and University Grants Commission India.
Uncontrolled Keywords: Double layers; Graphene oxides; High power; Hybrids material; Nanohybrids; Non-fossil energies; Performance; Polyoxomolybdates; Specific power; Symmetrics
Subjects: Chemical Engineering
Divisions: Department of Chemical Engineering
Depositing User: . LibTrainee 2021
Date Deposited: 14 Sep 2022 14:38
Last Modified: 14 Sep 2022 14:38
URI: http://raiith.iith.ac.in/id/eprint/10576
Publisher URL: http://doi.org/10.1021/acs.energyfuels.1c03300
OA policy: https://v2.sherpa.ac.uk/id/publication/7773
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