Optimizing Supercapacitor Performance with LSCF, ST, BST, and Coconut Shell Activated Carbon

Emerging electrochemical devices including fuel cells, supercapacitors, and lithium-ion batteries are crucial for energy conservation, storage, and transfer. When looking for a replacement for traditional batteries, electrochemical supercapacitors offer a viable option due to their long cycling life and high power supply capabilities. Problems with their high production cost and poor energy density, however, prevent their widespread use. Presenting here is the novel merging of perovskite (LSCF, BST, ST) and CSAC (coconut shell-based activated carbon) materials produced in a thin layer by spray pyrolysis. The integration of the electroactive medium with the double-layer electrode in electrochemical supercapacitors expands upon earlier research. Using cyclic voltammetry, electrochemical impedance spectroscopy, galvanostatic charge/discharge profiling, and modeling of the experimental data, the performance and dynamic electrical behavior of different supercapacitor topologies were examined for utilization in power applications. These structures, which were made of cotton lint and organic cellulose were shaped like asymmetric coin cells. Mixing BST with cellulose results in supercapacitors with 300 F/g specific capacitances, energy densities of 6.7 Wh/kg, power densities of 600 W/kg, and the ability to preserve over 95% of their initial capacitance even after multiple charging and discharging cycles. Based on these promising features, we demonstrated the practicality of our supercapacitor approach by connecting two identical cells and briefly powering a yellow LED. This breakthrough will pave the way for the development of supercapacitors that are more pliable, lightweight, and affordable, and which may have better energy-storing capabilities and longer lifespans.