This book provides a comprehensive overview of the synthesis, properties, and emerging applications of 3D graphene. It begins with an introduction to 3D graphene and covers the methods for synthesizing and printing 3D graphene. The book explores the characteristics of 3D graphene, including its morphology, surface area, and porosity, and the techniques used for characterizing it. Architectural and chemical aspects of 3D graphene for emerging applications are discussed, including energy storage, environmental remediation, and biosensing. The book reviews recent advancements in 3D graphene for electrochemical sensors, biosensors, and optical sensors, as well as its use in flexible sensors. It also covers the use of graphene-based materials for the remediation of hydrogen sulfide gas and the removal of inorganic pollutants and pharmaceutical residues. The book further explores the use of 3D graphene in metal-ion and metal-air batteries, flexible and wearable batteries, and high-performance supercapacitors. It also covers its use in photovoltaics, fuel cells, and as electrocatalysts and photocatalysts for water splitting. Additionally, the book discusses the use of 3D graphene in flexible electronics, capacitive de-ionization of water, and theranostic applications. Finally, the book addresses the toxicity, stability, recycling, and risk assessments of 3D graphene, providing a comprehensive understanding of the material's safety and sustainability considerations. Overall, this book is a valuable resource for researchers, engineers, and students interested in the synthesis, properties, and applications of 3D graphene.