In situ vanadophosphomolybdate impregnated into conducting polypyrrole for supercapacitor

Vannathan, Anjana Anandan and Maity, Sukanya and Kella, Tatinaidu and Shee, Debaprasad and Das, Partha Pratim and Mal, Sib Sankar (2020) In situ vanadophosphomolybdate impregnated into conducting polypyrrole for supercapacitor. Electrochimica Acta, 364. p. 137286. ISSN 00134686

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The fast modernization and advancement in lifestyle increase the consumption of power daily due to all innovative technologies, e.g., hybrid vehicles, solar cells, smart power grid, communication devices, artificial hearts, etc. Conducting organic polymer-based energy storage devices had attracted much attention due to the conductive nature for a long time. However, its application has been restricted because of swelling and shrinking capability during the charge and discharge cycle. The combination of redox-active inorganic metal oxides, such as polyoxometalates (multi-metal oxide cluster) with conduction polymers, could enhance the material's stability due to its fast multi-electron redox property. Here, we report the two polypyrroles combined vanadophosphomolybdates, namely PPy-H4[PVMo11O40] and PPy-H5[PV2Mo10O40] nanohybrid electrode materials. The PPy-H5[PV2Mo10O40] electrode material behaves as pseudocapacitance and can deliver an excellent capacitance of 561.1 F/g in 0.1 M H2SO4 electrolyte solution at a 0.2 A/g current density, indicating capacitive composite material. The electrochemical impedance spectroscopy (EIS) reveals that PPy-H5[PV2Mo10O40] is more capacitive than PPy-H4[PVMo11O40] and PPy with equivalent series resistance (ESR) of 5.74 Ω. The cell capacitance of PPy-H5[PV2Mo10O40] and PPy-H4[PVMo11O40] are found to be 5.38 and 9.15 mF, stipulating in small SC cell application. Likewise, the PPy-H5[PV2Mo10O40] nanohybrid electrode shows better responsive behavior with a relaxation time of 0.16 ms. Furthermore, the PPy-H5[PV2Mo10O40] electrode exhibits outstanding cycle stability, retaining ~95% of its capacitance after 4500 cycles as compare to PPy-H4[PVMo11O40] (~91%) electrode.

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IITH Creators:
IITH CreatorsORCiD
Shee, DebaprasadUNSPECIFIED
Item Type: Article
Uncontrolled Keywords: Cycle stability; Electrochemical impedance spectroscopy; Polypyrrole; Supercapacitors; Vanadophosphomolybdate;Artificial heart; Capacitance; Electric discharges; Electric power transmission networks; Electric resistance; Electrochemical impedance spectroscopy; Electrodes; Electrolytes; Electron spin resonance spectroscopy; Energy storage; Metals; Nanostructured materials; Organic polymers; Polymer solar cells; Polyoxometalates; Redox reactions; Supercapacitor; Swelling
Subjects: Electrical Engineering
Divisions: Department of Chemical Engineering
Depositing User: . LibTrainee 2021
Date Deposited: 24 Jul 2021 04:58
Last Modified: 24 Jul 2021 04:58
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