Issue 6, 2018

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

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

Supplementary files

Article information

Article type
Paper
Submitted
22 dek 2017
Accepted
06 apr 2018
First published
09 apr 2018

Energy Environ. Sci., 2018,11, 1563-1570

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, 11, 1563 DOI: 10.1039/C7EE03628K

To request permission to reproduce material from this article, please go to the Copyright Clearance Center request page.

If you are an author contributing to an RSC publication, you do not need to request permission provided correct acknowledgement is given.

If you are the author of this article, you do not need to request permission to reproduce figures and diagrams provided correct acknowledgement is given. If you want to reproduce the whole article in a third-party publication (excluding your thesis/dissertation for which permission is not required) please go to the Copyright Clearance Center request page.

Read more about how to correctly acknowledge RSC content.

Social activity

Spotlight

Advertisements