This book is designed to demonstrate the need for thermoelectric energy materials including non-conventional materials for heating and cooling applications in thermoelectric energy-efficient devices.In addition to the fundamentals, functionalities, and classifications associated with thermoelectric energy materials that can be used in industries, this book explores how these materials can contribute to high energy efficiency and sustainability, even though they are used in waste heat recovery systems.Climate change and global warming are also taken into consideration. Features:Exclusively focuses on non-conventional thermoelectric materials. Deals with key areas for new generation thermoelectric materials, such as nanostructured materials and non-traditional materials. Highlights the right thermoelectric material selection, their design, characterization, and testing. Covers additive manufacturing/3D printing for highly customized and efficient thermoelectric devices. Includes case studies based on real-world applications. This book is aimed at researchers and graduate students in materials science and clean technologies.