Evaluation of hydrogenation behaviors of MgH sub(x)-SCZY (Sr(Ce sub(0.9)Zr sub(0.1)) sub(0.95)Yb sub(0.05)O sub(3-[delta])) composites by ball-milling

Metal hydrides based on Mg are very promising materials for hydrogen storage applications because Mg hydride has a high hydrogen storage capacity, reversible hydriding behavior, light weight and low cost. However Mg hydride is difficult for practical uses because it requires high temperature and has a slower rate of hydrogen absorption/desorption. Therefore, various catalysts as the main factor for the adsorption of hydrogen have been actively studied. SCZY (Sr(Ce sub(0.9)Zr sub(0.1)) sub(0.95)Yb sub(0.05)O sub(3-[delta])), as one of the best proton conducting ceramics, has both high proton conductivity and high chemical stability. SCZY is expected to have a good influence as catalyst on the kinetics of hydrogenation behavior. In this study, we were prepared MgH sub(x)-SCZY composites using ball-milling. SCZY powder prepared by the sol-gel method was added to 5 wt.% and 10 wt.% of Mg hydride. The fabricated MgH sub(x)-SCZY composites were characterized by TG/DSC, XRD, SEM and BET. The hydrogenation behaviors were evaluated using a Sievert's type automatic PCT apparatus.