Pressure-composition-isotherm behaviors of MgH_x-BCY composites by reactive mechanical alloying

Abstract

The aim of the present paper is to report results on hydrogenation behavior of a new composite material, MgH_x-BCY10. Rare earth element-doped ABO₃ perovskite oxides have been studied for their possibility use in hydrogen storage. Especially, materials based on BaCeO₃ are known not only for their proton conductivity in hydrogen but also for the fact that they have higher hydrogen solubility than that of other metal oxides. So, the admixing of perovskite-type oxide in storage materials has to consider the possibility of MgH_x leading to sorption kinetics. And, these materials can be new materials for hydrogen storage. This research considers Pressure-Composition-Isothermal behavior according to perovskite-type oxide powder ratio and hydrogen pressure. The effects of added amount of BCY show a temperature of dehydrogenation that has decreased.From the results shown in the P-C-T curves, the MgHx-5wt% BCY composite was evaluated as having a 2.81 wt% maximum hydrogen storage capacity at 623 K. The absorption curves show that the MgH_x-10wt% BCY was composite evaluated at a maximum 0.43wt%/s hydrogen absorption rate at 623 K. From the results of the hydrogenation behavior observed, the role of BCY as a catalyst in hydrogen absorption is confirmed.