Super critically synthesized V2O5 spheres based supercapacitors using polymer electrolyte

• Published in: Applied surface science 2018-10, Vol.456, p.13-18
• Main Author: Kannagi, K.
• Format: Article
• Language: English
• Subjects: Energy storage; Solvothermal; Supercapacitor; V2O5 spheres
• ISSN: 0169-4332; 1873-5584
• DOI: 10.1016/j.apsusc.2018.06.089

Polymer gel and V2O5 based super capacitor device facilities attractive electrochemical features towards design of high performance supercapacitors. [Display omitted] •Advantageous supercritical fluid assisted solvothermal method has been adopted for synthesis of V2O5.•V2O5 spheres exhibit the maximum specific capacitance of 451 F g−1.•Asymmetric device based on V2O5, AC and gel polymer electrolyte exhibits the excellent electrochemical features. V2O5 spheres were successfully synthesized via solvothermal treatment using a super critical fluid. Structural, morphological and electrochemical properties of the V2O5 spheres were analysed. X-ray diffraction analysis confirms the formation of V2O5 with orthorhombic structure. Scanning electron microscopic images shows the formation of spheres and High resolution transmission electron microscopic images confirms the formation of spheres. The V2O5 sphere exhibits the maximum specific capacitance of 451 F g−1 at a scan rate of 2 mV s−1. Galvanostatic charge discharge (GCD) analysis reveals the maximum specific capacitance of 431 F g−1 at the current density of 0.5 A g−1. Asymmetric V2O5//AC device exhibits the energy density of 27.4 W h kg−1 and a power density of 747.3 W kg−1 with excellent cyclic stability i.e., 94% capacitance retention even at 2000 cycles.