Facile synthesis of MCo2O4(M= Ni, Cu, and Zn) materials for high-performing electrochemical capacitors with robust cyclic stability using redox additive electrolyte
Year: 2024
Type: article
Abstract: Developing efficient electrochemical capacitors relies heavily on the quality of electrode materials and electrolytes used. This report presents the successful solvothermal synthesis of three cobaltites, NiCo 2 O 4 , CuCo 2 O 4 , and ZnCo 2 O 4 , and their electrochemical performance in a 2 M KOH electrolyte. Among the three cobaltites, NiCo 2 O 4 showed the best electrochemical performance, delivering a specific capacity of 178 C/g when using FTO (fluorine-doped tin oxide) as the current collector. In addition, the performance of NiCo 2 O 4 was tested in different aqueous electrolytes , including KOH, NaOH, NaCl, and Na 2 SO 4 , and the specific capacity was found to vary in the order of 2 M KOH > 2 M NaOH > 2 M NaCl > 2 M Na 2 SO 4 . The performance of NiCo 2 O 4 was also assessed in various concentrations of KOH electrolyte (2 M KOH, 3 M KOH, and 4 M KOH), and the best performance was observed in 3 M KOH with a specific capacity of 928.3 C/g with Ni foam as the current collector. Finally, using redox additive electrolytes , the electrochemical performance of NiCo 2 O 4 was evaluated in both 3-electrode and 2-electrode systems. No studies have been conducted on the electrochemical performance of NiCo 2 O 4 using KFCN redox additive in a 3 M KOH electrolyte. In the three-electrode system, NiCo 2 O 4 showed a high specific capacity of 1005.5 C/g at 1 A/g, with 167 % capacity retention after 1000 charge-discharge cycles at a high current density of 30 A/g. The NiCo 2 O 4 //Activated Carbon asymmetric hybrid supercapacitors(AHSC) exhibited a maximum specific capacity of 115.6 C/g and a specific energy density of 85 Wh/kg at current density of 1 A/g. The AHSC also showed a capacitive retention of 120 % after 5000 charge-discharge cycles. The maximum power density was 13225 W/kg at a current density of 5 A/g while maintaining an energy density of 22 Wh/kg.
Source: Electrochimica Acta
Authors: Swarnaprava Samal, A Ruban Kumar
Language: English
Field: Materials Science
Domain: Physical Sciences
Open Access status: hybrid
Estimated APC paid: $3,870
OpenAlex ID: W4403269997