Evaluation of Weight, area, and Volumetric Specific Capacitance Performance of high Graphene Content ZnFe2O4 Electrode for Supercapacitors
摘要
The main purpose of this study is to synthesize ZnFe2O4 (ZFO) on a nickel foam along with a high amount of graphene. For this purpose, the productions were carried out with high amounts of graphene by hydrothermal method. According to the characterization results, it has been observed that a high amount of graphene nanosheets (GNPs) were successfully adhered to the current collector surface without agglomeration using this method. The electrochemical results have demonstrated a 97% enhancement in the performance of the ZFO electrode with the addition of GNPs, reaching 622 mF/cm² at a current density of 1 mA/cm². Additionally, the weight and volumetric specific capacitances of this electrode were calculated as 415 F/g and 519 F/cm³, respectively. Regarding the charging mechanism of this electrode, it was found to be 82% capacitive and 18% diffusion-controlled according to the Dunn method. The abundance of GNPs compared to those in the literature has increased the effectiveness of the diffusion-controlled charging mechanism.