Effect of Temperature on Electrochemical Behavior of Cobalt Diselenide Ternary Composite-based Supercapacitor

The electrochemical behavior of a cobalt diselenide (CoSe₂)-based ternary composite for hybrid supercapacitor applications across varying temperatures has been studied. To get advanced electrochemical results composite was synthesized by incorporating activated carbon and cellulose fibers with CoSe₂ (the optimization of the ternary composite is depicted in our other research paper). A series of electrochemical analyses was directed at different temperatures to assess the temperature-dependent behavior of the supercapacitor. The results demonstrate that the ternary composite exhibits enhanced electrochemical properties, with a high specific capacitance at 40˚C temperatures due to improved ion mobility and charge transfer kinetics. At 40°C, the composite-based cell revealed a specific capacitance of 248 F g⁻¹, which further decreased at higher temperatures, showcasing a negative correlation between temperature and electrochemical performance. The energy and power densities obtained for the same are 22 Wh kg-1 and 411 W kg-1. The findings suggest that such hybrid supercapacitors could play a dynamic part in energy storage technologies.