Journal
CATALYSTS
Volume 11, Issue 8, Pages -Publisher
MDPI
DOI: 10.3390/catal11080980
Keywords
carbon nanotube; freestanding negative electrode; polypyrrole; vanadium pentoxide gel; supercapacitor
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Funding
- Ministry of Science and Technology (MOST) of Taiwan
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In this study, V2O5/f-CNT/PPy composite films were prepared and evaluated as freestanding negative electrodes of supercapacitors. The composite electrode exhibited high areal capacitance and good cycling stability, attributed to the synergy between f-CNT with high conductivity and V2O5 and PPy with high-energy densities.
In this study, the vanadium pentoxide (V2O5), functionalized carbon nanotubes (f-CNT), and polypyrrole (PPy) based composites films have been prepared through a facile synthesis method and their electrochemical performance were evaluated as freestanding negative electrodes of supercapacitor. A hydrous V2O5 gel prepared by treating V2O5 powder with H2O2 was mixed with f-CNT to obtain V2O5/f-CNT composite film. V2O5/f-CNT composite was then coated with PPy through vapor phase polymerization method. The PPy deposited on the V2O5/f-CNT prevented the dissolution of V2O5 and thus resulted in an improved the capacitance and cycle life stability for V2O5/f-CNT/PPy composite electrode. V2O5/f-CNT/PPy freestanding negative electrode exhibited a high areal capacitance value (1266 mF cm(-2) at a current density of 1 mA cm(-2)) and good cycling stability (83.0% capacitance retention after 10,000 charge-discharge cycles). The superior performance of the V2O5/f-CNT/PPy composite electrode can be attributed to the synergy between f-CNT with high conductivity and V2O5 and PPy with high-energy densities. Thus, V2O5/f-CNT/PPy composite based electrode can effectively mitigate the drawbacks of the low specific capacitance of CNTs and the poor cycling life of V2O5.
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