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Structures and Electrochemical Hydrogen Storage Properties of the As-Spun RE-Mg-Ni-Co-Al-Based AB2-Type Alloys Applied to Ni-MH Battery

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Abstract

In this paper, the La0.8−x Ce0.2Y x MgNi3.5Co0.4Al0.1 (x = 0, 0.05, 0.1, 0.15, 0.2) alloys were synthesized via smelting and melt spinning. The effect of Y content on the structure and electrochemical hydrogen storage characteristics of the as-cast and spun alloys was investigated. The identifications of XRD and SEM demonstrate that the experimental alloys possess a major phase LaMgNi4 and a minor phase LaNi5. The variation of Y content results in an obvious transformation of the phase abundance rather than phase composition in the alloys, namely LaMgNi4 phase increases while LaNi5 phase decreases with Y content growing. Furthermore, the replacement of Y for La causes the lattice constants and cell volume to clearly decrease and markedly refines the alloy grains. The electrochemical tests reveal that these alloys can obtain the maximum values of discharge capacity at the first cycling without any activation needed. With Y content growing, the discharge capacity of the alloys obviously declines, but its cycle stability remarkably improves. Moreover, the electrochemical dynamics of the alloys, involving the high-rate discharge ability, hydrogen diffusion coefficient (D), limiting current density (I L), and charge transfer rate, initially augment and then decrease with rising Y content.

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Acknowledgments

This work was financially supported by the National Natural Science Foundation of China (51371094 and 51471054) and the Natural Science Foundation of Inner Mongolia, China (2015MS0558).

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Correspondence to Yanghuan Zhang.

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Manuscript submitted November 10, 2016.

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Zhang, Y., Yuan, Z., Shang, H. et al. Structures and Electrochemical Hydrogen Storage Properties of the As-Spun RE-Mg-Ni-Co-Al-Based AB2-Type Alloys Applied to Ni-MH Battery. Metall Mater Trans A 48, 2472–2482 (2017). https://doi.org/10.1007/s11661-017-4052-7

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  • DOI: https://doi.org/10.1007/s11661-017-4052-7

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