Metals as Clean Fuels explores the innovative use of metals as a sustainable energy source. It presents a scalable selective leaching method to activate metal fuels by increasing their surface-to-volume ratio, significantly enhancing their reactivity with water for hydrogen and heat generation. This approach positions metal fuels as a superior alternative to fossil fuels, offering higher energy density and the crucial benefit of generating energy without CO2 emissions. Additionally, the book addresses key questions and working principles in its initial chapters before delving into the energy densities of various metals, from zinc to aluminum.Chapters 8 and 9 focus on novel sustainable fabrication methods for metal/metal nanocomposites, while Chapter 10 introduces an advanced methodology for analyzing porous material systems. This monograph is a pioneering work in discussing nanostructured metals as clean fuels, with the potential to drive significant advancements in energy applications and material science research. - Examines various methods of metal fuel activation through nanostructuring, i.e., creating nanoporous metal fuels through selective chemical and electrolytic dealloying - Discusses a novel, versatile electrolytic method for making nanoporous metals that nearly eliminates the loss of sacrificial materials - Includes the characterization of the fascinating intertwining of two different items in porous structures, i.e., geometry and topology