Book excerpt: This book covers next-generation nanocomposite supercapacitor materials. It deals with a wide range of emerging and sustainable supercapacitors based on, e.g., low-dimensional materials including transition metal oxides, carbons, Mxenes, etc., and metal-organic frameworks. Additionally, it features up-to-date coverage of advanced supercapacitors such as 3D printing, atomic layer deposition, recycling, quantum, on-chip, shape memory, self-healing, and micro-scale supercapacitors. This book is part of the Handbook of Nanocomposite Supercapacitor Materials. Supercapacitors have emerged as promising devices for electrochemical energy storage, playing an important role in energy harvesting for meeting the current demands of increasing global energy consumption. The handbook covers the materials science and engineering of nanocomposite supercapacitors, ranging from their general characteristics and performance to materials selection, design and construction. Covering both fundamentals and recent developments, this handbook serves a readership encompassing students, professionals and researchers throughout academia and industry, particularly in the fields of materials chemistry, electrochemistry, and energy storage and conversion. It is ideal as a reference work and primary resource for any introductory senior-level undergraduate or beginning graduate course covering supercapacitors.