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Electrochemical Studies on the Ca-Based Hydrogen Storage Alloy for Different Milling Times
Y. Dabaki,C. Khaldi,N. Fenineche,O. ElKedim,M. Tliha,J. Lamloumi 대한금속·재료학회 2021 METALS AND MATERIALS International Vol.27 No.5
The CaNi4.8Mn0.2powder was synthesized by mechanical alloying, under an atmosphere of argon at room temperature,at different milling times (2, 10, 20, 30, 40, 50 and 60 h) with ball to powder weight ratio of 8:1. The structural and morphologicalcharacterizations of the CaNi4.8Mn0.2powder were carried, respectively, by scanning electron microscopy andX-ray diffraction. After 2 h, all the alloys had a biphasic structure, two major phases, Ni and Ca2Ni7,remained virtuallyunchanged when a small amount of Mn was added. After more than 40 h of milling, the same peaks of the Ni and Ca2Ni7phases appeared, while the intensity of the peaks decreased, indicating an additional amorphization process. After 50 h ofmilling, this damping was followed by the crystallization amorphization. The electrochemical properties of CaNi4.8Mn0.2electrodes were studied at different milling times (10, 20, 30, 40, 50 and 60 h) and in KOH electrolyte concentrations (1 Mand 6 M) at ambient temperature, as anodes in the Ni–MH battery. Different techniques were used, such as galvanostaticpolarization, potentiostatic polarization and potentiodynamic polarization.