Abstract
Alkali-earth element of magnesium has been expected as a large capacity of hydrogen storage materials. However, low hydrogen reactivity even at higher temperature under higher pressure of hydrogen is a significant problem for the practical utilization. Recently, we reported improvements of hydrogen reactivity of alkali metals such as an ion bonding hydrogen storage materials by means of rare earth oxide mixing. Because a similar effect has been expected for magnesium, in this study, we report an interesting result of rare earth oxide doping into magnesium by mechanical mixing for the higher hydrogen reactivity, where the rare earth oxide may enlarge the diffusion path in the sample powder particles. As a result, Mg+26.1 mass%CeO2 absorbs and desorbs more than 4 mass% H2 (including weight of catalyst) at 573-673 K within 10 min, while the sample without rare earth oxide exhibits drastically small hydrogen reactivity.
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