Electrochemical Behaviour of Lithium, Sodium and Potassium Ion Electrolytes in a Na0.33V2O5 Symmetric Pseudocapacitor with High Performance and High Cyclic Stability

• Published in: ChemElectroChem Vol. 5; no. 1; pp. 101 - 111
• Main Authors: Manikandan, Ramu, Raj, C. Justin, Rajesh, Murugesan, Kim, Byung Chul, Sim, Ju Yong, Yu, Kook Hyun
• Format: Journal Article
• Language: English
• Published: Weinheim John Wiley & Sons, Inc 01.01.2018
• Subjects: Aqueous electrolytes; Capacitance; co-precipitation; Discharge; Electrochemical analysis; Electrolytes; Lithium; Nanocomposites; Nanorods; pseudocapacitors; Stability; Supercapacitors; symmetric supercapacitors; Synthesis; transition metal oxides
• ISSN: 2196-0216; 2196-0216
• DOI: 10.1002/celc.201700923

A high‐performance symmetric supercapacitor was fabricated using a Na0.33V2O5 nanocomposite synthesized by means of a simple co‐precipitation technique. The structural and morphological investigation showed that the synthesized Na0.33V2O5 nanocomposite exhibited a monoclinic structure with a nanorod‐like morphology. The electrochemical properties of the Na0.33V2O5 symmetric supercapacitor were studied utilizing three different aqueous electrolytes, such as 1 M of LiCl, NaCl and KCl, respectively. Interestingly, the fabricated Na0.33V2O5 symmetric supercapacitors exhibited excellent electrochemical capacitance behaviour in all the electrolytes with a maximum specific capacitance value of 168 F g−1 in 1 M LiCl, 146 F g−1 in 1 M NaCl and 132 F g−1 in 1 M KCl electrolytes at 0.5 A g−1 discharge current density. In addition, Na0.33V2O5 symmetric supercapacitors demonstrated an excellent cyclic stability in 1 M NaCl electrolyte with high capacitance retention of approximately 81 % after 50 000 charge/discharge cycles. On balance: A symmetric supercapacitor was fabricated utilizing Na0.33V2O5 nanorods and its performance was studied in Li+, Na+ and K+ cation based aqueous electrolytes. The Na0.33V2O5 symmetric supercapacitor showed better electrochemical performance with excellent cyclic stability for 50 000 charge/discharge cycles in all three electrolytes.