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- W1997697069 abstract "Abstract In order to improve the hydrogen storage kinetics of the Mg2Ni-type alloys, Ni in the alloy was partially substituted by element Co, and melt-spinning technology was used for the preparation of the Mg2Ni1−xCox (x = 0, 0.1, 0.2, 0.3, 0.4) hydrogen storage alloys. The structures of the as-cast and spun alloys are characterized by XRD, SEM and TEM. The hydrogen absorption and desorption kinetics of the alloys were measured by an automatically controlled Sieverts apparatus. The electrochemical hydrogen storage kinetics of the as-spun alloys is tested by an automatic galvanostatic system. The hydrogen diffusion coefficients in the alloys are calculated by virtue of potential-step method. The electrochemical impedance spectrums (EIS) and the Tafel polarization curves are plotted by an electrochemical workstation. The results show that the substitution of Co for Ni notably enhances the glass forming ability of the Mg2Ni-type alloy. Furthermore, the substitution of Co for Ni, instead of changing major phase Mg2Ni, leads to forming secondary phases MgCo2 and Mg. Both the melt spinning treatment and Co substitution significantly improve the hydrogen absorption and desorption kinetics. The high rate discharge ability, the hydrogen diffusion coefficient and the limiting current density of the alloys significantly increase with raising both the spinning rate and the amount of Co substitution." @default.
- W1997697069 created "2016-06-24" @default.
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- W1997697069 date "2011-02-01" @default.
- W1997697069 modified "2023-09-27" @default.
- W1997697069 title "An investigation on hydrogen storage kinetics of nanocrystalline and amorphous Mg2Ni1−xCox (x=0–0.4) alloy prepared by melt spinning" @default.
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- W1997697069 doi "https://doi.org/10.1016/j.jallcom.2010.11.113" @default.
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