This contributed volume overviews the advancements in supercapacitor technology, highlighting the role of hybrid nanostructures in enhancing charge storage capabilities and their applications in transportation, electronics, and renewable energy. It addresses fundamental material design and hybrid architecture formation and explores critical challenges associated with these technologies. The book includes clear experimental procedures for synthesizing different nano-hybrid structures, and it also covers testing methods for various types of supercapacitors, including electrical double-layer capacitors and hybrid devices. Additionally, it discusses various charge storage mechanisms and configurations for capacitor assemblies, providing valuable insights for improving energy density. The intended audience includes researchers, graduate students, and professionals in materials science, energy storage, and related fields.