Our research is directed toward the development of advanced electrode materials and device architectures for high-performance supercapacitors, with a focus on achieving high energy density, high power density, and ultra-long cycling stability. Supercapacitors offer unique advantages such as rapid charge-discharge capability, high reliability, and extended operational life, making them attractive for next-generation energy storage systems. We focus on the design and synthesis of functional electrode materials, including carbon-based materials, transition metal oxides/sulfides, and hybrid nanocomposites, to enhance charge storage mechanisms and electrochemical performance. Through nanostructure engineering, defect tuning, and interface design, we aim to improve electrical conductivity, ion transport kinetics, and structural integrity. We also explore electrolyte engineering and device configuration, including symmetric and asymmetric systems, to optimize energy-power balance and long-term stability.