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Enhanced Power Density of Graphene Oxide–Phosphotetradecavanadate Nanohybrid for Supercapacitor Electrode.
- Source :
- Journal of Materials Engineering & Performance; Feb2021, Vol. 30 Issue 2, p1371-1377, 7p
- Publication Year :
- 2021
-
Abstract
- Successful exploration of supercapacitor (SC) material to integrate with high energy and high power density storage device still remains a daunting challenge. Conducting carbon nanostructures have been primarily used for this purpose; however, most of their surface area remains unutilized throughout the storage process. Herein, a new type of hybrid material has been reported by effectively using active sides of carbon nanostructures. Insertion of faradaic-type polyoxometalates (POMs), namely phosphotetradecavanadate (Na<subscript>7</subscript>[H<subscript>2</subscript>PV<subscript>14</subscript>O<subscript>42</subscript>, hereafter described as PV<subscript>14</subscript>), into the graphene oxide (GO) matrix creates a novel hybrid material for SC applications. Owing to the formation of nanohybrid, it can store charges both electrostatically and electrochemically. PV<subscript>14</subscript>/GO composite's electrochemical behavior in different electrolyte (acidic/neutral) solutions shows different types of characteristics. The PV<subscript>14</subscript>/GO composite as a working electrode exhibits a high galvanostatic capacitance of 139 F/g while maintaining at a power density of 97.94 W/kg in 0.25 M H<subscript>2</subscript>SO<subscript>4</subscript> electrolyte. The specific energy density was also found out to be around 56.58 Wh/kg at a 5 mV/s scan rate for the same electrolyte. Furthermore, in 1 M Na<subscript>2</subscript>SO<subscript>4</subscript> solution, PV<subscript>14</subscript>/GO composite demonstrates a specific capacitance of 85.4 F/g at a scan rate of 5 mV/s. The equivalent series resistance for the device was found to be approximately 0.51 Ω with a circuit resistance of 3.881 Ω, using electrochemical impedance spectroscopy. The cell capacitance, employing the Nyquist plot, was calculated to be around 2.78 mF. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 10599495
- Volume :
- 30
- Issue :
- 2
- Database :
- Complementary Index
- Journal :
- Journal of Materials Engineering & Performance
- Publication Type :
- Academic Journal
- Accession number :
- 148678625
- Full Text :
- https://doi.org/10.1007/s11665-020-05349-w