Asymmetric polyoxometalate-polypyrrole composite electrode material for electrochemical energy storage supercapacitors
Anandan Vannathan, Anjana and Chandewar, Pranay R. and Shee, Debaprasad and Sankar Mal, Sib (2022) Asymmetric polyoxometalate-polypyrrole composite electrode material for electrochemical energy storage supercapacitors. Journal of Electroanalytical Chemistry, 904. pp. 1-12. ISSN 1572-6657
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Abstract
Nowadays, metal-oxides impregnated conducting polymers as electrode materials are attracted much attention due to their higher stability. Here, the metal-oxide cluster, polyoxometalate (K5H2[PV4W8O40]·11H2O, PV4W8), was introduced into the polypyrrole (PPy) matrix to overcome the polymers stability issues, and thus, the resulting novel PV4W8/PPy (symmetric) composite electrode has been reported. XPS confirmed the presence of all atoms on the polymer backbone with respective oxidation states. Nevertheless, doping of PV4W8 on the conductive PPy matrix's surface can affectively improve the ion's transfer. Finally, the asymmetric PV4W8-PPy/PPy composite exhibits a prodigious specific capacitance of 291 F g−1, larger than the PPy (90.01 F g−1) and PV4W8 (39.03 F g−1) at 0.4 A g−1 current density. The PV4W8-PPy/PPy (asymmetric) electrode showed excellent cycle stability. However, a symmetric supercapacitor device based on PV4W8/PPy composite possesses a specific capacitance of 195.27 F g−1 and an energy density of 8.94 Wh kg−1 at the same current density as PV4W8-PPy/PPy (asymmetric) electrode with remarkable cycle stability. © 2021 Elsevier B.V.
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Item Type: | Article | ||||
Additional Information: | A. A. V. thanked the National Institute of Technology Karnataka for financial aid to carry out the research. | ||||
Uncontrolled Keywords: | Asymmetric; cyclic stability; Polyoxometalate; Polypyrrole; Supercapacitor | ||||
Subjects: | Chemistry Chemical Engineering |
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Divisions: | Department of Chemical Engineering Department of Chemistry |
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Depositing User: | . LibTrainee 2021 | ||||
Date Deposited: | 28 Jul 2022 09:01 | ||||
Last Modified: | 28 Jul 2022 09:01 | ||||
URI: | http://raiithold.iith.ac.in/id/eprint/9984 | ||||
Publisher URL: | http://doi.org/10.1016/j.jelechem.2021.115856 | ||||
OA policy: | https://v2.sherpa.ac.uk/id/publication/12827 | ||||
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