This book comprehensively describes the fundamentals of electrochemical water electrolysis as well as the latest materials and technological developments. It addresses a variety of topics such as electrochemical processes, materials, components, assembly and manufacturing, and degradation mechanisms, as well as challenges and strategies. It also includes an understanding of how materials and technologies for electrochemical water electrolysis have developed in recent years, and it describes the progress in improving performance and providing benefits to energy systems and applications. Features the most recent advances in electrochemical water electrolysis to produce hydrogen Discusses cutting-edge materials and technologies for electrochemical water electrolysis Includes both experimental and theoretical approaches that can be used to guide and promote materials as well as technological development for electrochemical water electrolysis Comprises work from international leading scientists active in electrochemical energy and environmental research and development Provides invaluable information that will benefit readers from both academia and industry With contributions from researchers at the top of their fields, the book includes in-depth discussions covering the engineering of components and applied devices, making this an essential read for scientists and engineers working in the development of electrochemical energy devices and related disciplines.