Abstract
The performance of synergetic hybrid aerogel materials of vanadia and graphene as electrode materials in supercapacitors was evaluated. The hybrid materials were synthesized by two methods. In Method I, premade graphene oxide (GO) hydrogel was first chemically reduced by L-ascorbic acid and then soaked in vanadium triisopropoxide solution to obtain V2O5 gel in the pores of the reduced graphene oxide (rGO) hydrogel. The gel was supercritically dried to obtain the hybrid aerogel. In Method II, vanadium triisopropoxide was hydrolyzed from a solution in water with GO particles uniformly dispersed to obtain the hybrid gel. The hybrid aerogel was obtained by supercritical drying of the gel followed by thermal reduction of GO. The electrode materials were prepared by mixing 80 wt % hybrid aerogel with 10 wt % carbon black and 10 wt % polyvinylidene fluoride. The hybrid materials in Method II showed higher capacitance due to better interactions between vanadia and graphene oxide particles and more uniform vanadia particle distribution.
Highlights
Supercapacitors have gained considerable attention as energy storage devices due to their high storage capability, excellent discharge-charge rates, long life cycle, and low maintenance costs [1]
This paper presents two facile and green methods for preparation of hybrid aerogels based on V2 O5 and reduced graphene oxide
The BET-specific surface area of the V2 O5 -reduced graphene oxide (rGO)-6 hybrid aerogel is greater than the rGO-V2 O5 -0.82 hybrid aerogel, suggesting that there is more capacity for energy storage in hybrid materials produced by Method II
Summary
Supercapacitors have gained considerable attention as energy storage devices due to their high storage capability, excellent discharge-charge rates, long life cycle, and low maintenance costs [1]. C 2016, 2, 21 somewhat restricted due to poor cycle stability caused by the collapse of the structures during the charge-discharge process and the low values of electrical conductivity [8,9,10]. These obstacles must be removed to capitalize on the higher specific capacitance values of V2 O5 , possibly through identification of a set of synergistic materials. In this work, such a synergy was obtained by combining V2 O5 and graphene aerogels into single hybrid materials. The synergetic materials in this work avoid the often-encountered compatibility issues of two entirely different materials in the hybrids [11]
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
