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Synergism induced exceptional capacity and complete reversibility in Mg–Y thin films: enabling next generation metal hydride electrodes

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Abstract

Much of the current research into metal hydride (MH) electrodes follows the principle that the materials should be composed of hydrogen-absorbing elements (A) and non-hydrogen-absorbing elements (B). This classical design principle, however, severely limits the potential capacities of the MH electrodes (typically <400 mA h g−1). Herein, we demonstrate a fundamentally new strategy to design high capacity MH electrodes without using B elements by inducing synergism in the dehydrogenation process. Mg24Y5 thin films, which are composed of two strong hydrogen-absorbing elements, achieve an exceptional electrochemical hydrogen storage capacity of ∼1500 mA h g−1 (5.6 wt%). All the absorbed hydrogen, including extremely stable H in YH2, can be reversibly desorbed through thermodynamic synergism. The present study provides enlightening insights to design high capacity MH electrodes and therefore enables the revival of Ni–MH batteries, and the emergence of next generation MH–air batteries.

Graphical abstract: Synergism induced exceptional capacity and complete reversibility in Mg–Y thin films: enabling next generation metal hydride electrodes

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Publication details

The article was received on 22 Dec 2017, accepted on 06 Apr 2018 and first published on 09 Apr 2018


Article type: Paper
DOI: 10.1039/C7EE03628K
Citation: Energy Environ. Sci., 2018, Advance Article
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    Synergism induced exceptional capacity and complete reversibility in Mg–Y thin films: enabling next generation metal hydride electrodes

    K. Fu, J. Chen, R. Xiao, J. Zheng, W. Tian and X. Li, Energy Environ. Sci., 2018, Advance Article , DOI: 10.1039/C7EE03628K

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