This volume explores research related to energy conversion devices and related fundamental mechanisms, particularly in the field of fuel cell research, hydrogen storage, and superconductors. With an emphasis on fundamentals and applications of materials science and engineering related to energy conversion, this volume focuses on recent advances made in the general field of conversion, storage, and transmission of energy. Fuel cells, hydrogen and tritium storage, batteries, superconductors, magnets, membrane materials, thermal energy storage materials, photovoltaics, and related topics are discussed. From 2004 TMS Annual Meeting to be held in Charlotte, North Carolina, March 14-18, 2004.