Electrochemical Behavior of Li+, Na+ and K+ Ion Electrolyte in Na0.33V2O5 Symmetric Pseudocapacitor with High-Performance and Extremely High Cyclic Stability

A high performance symmetric supercapacitor was fabricated using Na0.33V2O5 nanocomposite synthesized via a simple co-precipitation technique. The structural and morphological investigation showed that the synthesized Na0.33V2O5 nanocomposite exhibited a monoclinic structure with nanorod like morphology. The electrochemical properties of the Na0.33V2O5 symmetric supercapacitor was studied utilizing three different aqueous electrolytes such as 1M of LiCl, NaCl and KCl respectively. Interestingly, the fabricated Na0.33V2O5 symmetric supercapacitors exhibited excellent electrochemical capacitance behavior in all the electrolytes with a maximum specific capacitance value of 168 F g-1 in 1M LiCl, 146 F g-1 in 1M NaCl and 132 F g-1 in 1M KCl electrolytes at 0.5 A g-1 discharge current density. In addition, Na0.33V2O5 symmetric supercapacitors demonstrated an excellent cyclic stability especially in 1M NaCl electrolyte with high capacitance retention of ~81% after 50,000 charge/discharge cycles.