Proportion of composition in a composite does matter for advanced supercapacitor behavior

We report an advanced aqueous asymmetric supercapacitor (AAS) comprised of Ni 3 V 2 O 8 @MWCNT (CNV) composite as the positive electrode and β FeOOH@rGO (GF) composite as the negative electrode. According to the literature surveyed, this new Ni 3 V 2 O 8 @MWCNT composite has been exploited for the f...

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Bibliographic Details
Published in:Journal of materials chemistry. A, Materials for energy and sustainability Materials for energy and sustainability, 2016-01, Vol.4 (44), p.17440-17454
Main Authors: Sahoo, Ramkrishna, Pal, Anjali, Pal, Tarasankar
Format: Article
Language:English
Subjects:
Alternative energy sources
Asymmetry
Capacitance
Electrodes
Iron
Rechargeable batteries
Supercapacitors
Synthesis
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Summary:We report an advanced aqueous asymmetric supercapacitor (AAS) comprised of Ni 3 V 2 O 8 @MWCNT (CNV) composite as the positive electrode and β FeOOH@rGO (GF) composite as the negative electrode. According to the literature surveyed, this new Ni 3 V 2 O 8 @MWCNT composite has been exploited for the first time as a positive electrode. We have prepared different Ni 3 V 2 O 8 @MWCNT composites using variable proportions of participating materials via our laboratory-developed modified hydrothermal (MHT) technique. Among them, the as-synthesized CNV composite exhibited excellent pseudocapacitive activity (specific capacitance value of 2920 F g −1 at 2 A g −1 specific current, excellent rate capability and 96% capacitance retention after 10 000 cycles). Similarly, different β FeOOH@rGO composites were also synthesized using the same MHT, again with different proportions of the iron component and rGO. Among them, GF exhibited specific capacitance values of 1306 F g −1 at 1 A g −1 specific current with excellent rate capability and extraordinary cyclic durability. Furthermore, the assembled Ni 3 V 2 O 8 @MWCNT//β FeOOH@rGO asymmetric supercapacitor exhibited very impressive electrochemical activity. It exhibited a specific capacitance of 976 F g −1 at 0.25 A g −1 specific current and maximum specific energy of 86.7 W h kg −1 at a specific power of 198.71 W kg −1 . Due to the impressive specific energy value, the as-fabricated asymmetric supercapacitor could be a good alternative for rechargeable batteries.
ISSN:2050-7488
2050-7496
DOI:10.1039/c6ta07467g