Electrochemical investigation of an ISNO based super capcitor with high specific Capacitance and Energy Density

The development of high-performance supercapacitors with enhanced energy density and longterm stability is essential to meet the growing demand for efficient energy storage systems. In this work, we report the electrochemical performance of an LSNO-based electrode material
investigated for supercapacitor applications using an symmetric supercapacitor (SC) configuration. Cyclic voltammetry measurements conducted within a potential window of 0- 0.6 V at various scan rates reveal quasi-rectangular shapes with distinct redox features, indicating Faradaic pseudocapacitance. Galvanostatic charge-discharge studies demonstrate nearly symmetric charge-discharge profiles, confirming good electrochemical reversibility and
stable charge storage behavior. The device delivers a high specific capacitance of 403 F g1,
reflecting efficient utilization of electroactive sites and rapid ion transport. The symmetric
supercapacitor exhibits a high energy density of 72.54 Wh kg ¹ with a corresponding power
density of 749 W kg¹, highlighting its excellent energy-power balance. Electrochemical
impedance spectroscopy reveals low internal resistance and favorable charge-transfer kinetics,
which contribute to the superior electrochemical performance. Furthermore, the device shows
excellent cycling stability, retaining approximately 85% of its initial capacitance after 3000
charge-discharge cycles. Charge balance between the positive and negative electrodes was
optimized to ensure stable operation and prevent electrode degradation. Compared with
previously reported perovskite-based supercapacitor materials, the present system exhibits
significantly enhanced electrochemical performance, demonstrating its strong potential for
next-generation high-energy supercapacitor applications.