Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7934590 | Progress in Natural Science: Materials International | 2018 | 7 Pages |
Abstract
The addition of catalysts and rare earth elements is considered to be very effective methods to enhance the hydrogenation/dehydrogenation properties of Mg and Mg-based hydrides. In this paper, the REMg11Ni+â¯5â¯wt% CeO2 (RE = Sm, Y) (named REMg11Ni-5CeO2 (RE = Sm, Y)) alloys were fabricated through ball milling. The phase composition and structure of the as-milled alloys were investigated in detail. The isothermal hydrogen storage thermodynamics and kinetics of the as-milled alloys were measured by using an automatically Sievert apparatus. Non-isothermal dehydrogenation performance of the alloys was investigated by thermogravimetry (TG) and differential scanning calorimetry (DSC) at different heating rates. The results revealed that all the as-milled alloys were the nanocrystalline and amorphous structure. The RE =â¯Y alloy had a faster hydriding rate and a lower onset hydrogen desorption temperature than the RE =â¯Sm alloy. The superior property of the RE =â¯Y alloy depended on the decrease of the dehydrogenation activation energy. By means of the measurement of Pressure-Composition-Isotherm (P-C-T) curves, the thermodynamic parameters of the REMg11Ni-5CeO2 (RE = Sm, Y) alloys were calculated, and the dehydrogenation enthalpy change was 74.86â¯kJ/mol for the RE =â¯Sm alloy and 73.75â¯kJ/mol for the RE =â¯Y alloy, respectively.
Related Topics
Physical Sciences and Engineering
Materials Science
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Authors
Yanghuan Zhang, Yaqin Li, Hongwei Shang, Zeming Yuan, Yan Qi, Dongliang Zhao,