This book provides a comprehensive and contemporary overview of advances in energy and energy storage technologies. Although the coverage is varied and diverse, the book also addresses unifying patterns and trends in order to enrich readers' understanding of energy and energy storage systems, particularly hydrogen energy storage, including e.g. their morphology, porosity and material structure. Readers will also gain insights into the hydrogen storage performance landscape, based on data released by the US Department of Energy (DOE), providing a basis for understanding real-world applications. The book also discusses the superior hydrogen storage performance of solid-state materials and explores the physical and chemical properties that can potentially affect their performance.