Effect of various aqueous electrolytes on the electrochemical performance of V2O5 spindle-like nanostructures as electrode material for supercapacitor application

Abstract

The electrochemical behavior of V 2 O 5 spindle-like nanostructures synthesized through hydrothermal method is studied for supercapacitor applications. The electrochemical supercapacitive performance of the prepared electrode was investigated using cyclic voltammeters (CV), Chronopotentiometry (CP), and Electrochemical impedance spectroscopy (EIS) analyses. The crystallographic structure and phase purity of the V 2 O 5 electrode is investigated by the X-ray diffraction (XRD) analysis. To further confirm the formation of V 2 O 5 , the Fourier-transform infrared (FT-IR) spectroscopy, and Fourier-transform Raman spectroscopy (FT-Raman) investigations were carried out. The formation of V 2 O 5 is confirmed by high-resolution transmission electron microscopy (HR-TEM) analyses. The electrode material delivered a high specific capacitance of 403F/g at 1A/g current density in the mixed electrolyte solution (1 M Na 2-SO 4 ? 0.5 M KOH). In this mixed electrolyte, V 2 O 5 spindle-like electrode showed a good cyclic stability of 3000 cycles with better capacity retention of 85% at 10A/g.

Boosting the Capacitor Performance of the Metal Organic Frameworks Derived V2O5 Nanoflower by Cu Doping

“…V 2 O 5 has been developed for supercapacitor electrodes due to its abundant oxidation state (+5, +4, +3, and +2), which leads to the possibility of storing multiple electrons per formula unit, and this may be one of the possible reasons for their high theoretical specific capacity (2010 F g –1 ) . But, due to the poor electron diffusion rate and slow diffusion of Li + , , the specific capacitance of the previously reported V 2 O 5 (400–500 F g –1 ) ,,− was far from the theoretical specific capacitance. Considerable efforts have been devoted to boosting the electron diffusion rate of V 2 O 5 and further enhancing its capacitive performances .…”