Abstract
The as-cast RE–Mg–Ni-based AB2-type La1−xPrxMgNi3.6Co0.4 (x = 0–0.4) alloys were prepared by vacuum induction melting followed by annealing treatment. The phase composition and structure were characterized by X-ray diffraction (XRD) and scanning electron microscope (SEM). The results show that LaMgNi4 and LaNi5 coexist in as-cast alloys, but only LaMgNi4 is detected in the annealed alloys. The morphology of annealed alloys is more homogeneous than that of as-cast alloys. The gaseous hydrogen storage and electrochemical properties were investigated by pressure–composition isotherm (P-C-T) and electrochemical measurements. The P-C-T curves of annealed alloys show flatter and wider pressure plateaus corresponding to absorption/desorption pressure plateaus of LaMgNi4 hydride. But the maximum hydrogen storage content of annealed alloys is lower than that of as-cast alloys. In consideration of the electrochemical properties, the annealed La0.8Pr0.2MgNi3.6Co0.4 alloy exhibits a maximum discharge capacity of 354.2 mAh·g−1.
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This study was financially supported by the National Natural Science Foundations of China (Nos. 51161015 and 51371094) and the Natural Science Foundation of Inner Mongolia, China (No. 2011ZD10).
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Zhai, TT., Xu, S., Yang, T. et al. Hydrogen storage properties of La1−xPrxMgNi3.6Co0.4 (x = 0–0.4) alloys with annealing treatment. Rare Met. 38, 871–876 (2019). https://doi.org/10.1007/s12598-015-0549-7
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DOI: https://doi.org/10.1007/s12598-015-0549-7