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Improvement of the hydrogen-storage performances of Li–Mg–N–H system

Published online by Cambridge University Press:  03 March 2011

Yongfeng Liu ,
Jianjiang Hu ,
Zhitao Xiong ,
Guotao Wu  and
Ping Chen
Yongfeng Liu
Affiliation:
Department of Physics, National University of Singapore, Singapore 117542, Singapore
Jianjiang Hu
Affiliation:
Department of Physics, National University of Singapore, Singapore 117542, Singapore
Zhitao Xiong
Affiliation:
Department of Physics, National University of Singapore, Singapore 117542, Singapore
Guotao Wu
Affiliation:
Department of Physics, National University of Singapore, Singapore 117542, Singapore
Ping Chen*
Affiliation:
Department of Chemistry, National University of Singapore, Singapore 117543, Singapore; and Department of Physics, National University of Singapore, Singapore 117542, Singapore
*
a) Address all correspondence to this author. e-mail: phychenp@nus.edu.sg This author was an editor of this journal during the review and decision stage. For the JMR policy on review and publication of manuscripts authored by editors, please refer to http://www.mrs.org/jmr_policy.
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Abstract

Li2MgN2H2 can reversibly store more than 5.5 wt% hydrogen. However, the high activation energy of hydrogen desorption poses a kinetic barrier for low-temperature operation. In this work, the composition of the Li–Mg–N–H system has been modified by the partial substitution of Mg or Li by Na. The changes in structure and hydrogen absorption/desorption kinetics have been investigated. It was found that the peak temperature for hydrogen desorption was decreased by ∼10 °C, and that the hydrogen absorption/desorption isotherms were also significantly changed. Furthermore, the activation energy calculated by the Kissinger’s approach was reduced after the substitution of Mg or Li by Na. In addition, the different dehydrogenation structures were detected at different molar ratios of Mg, Li, and Na.

Keywords

HydrogenationKineticsStorage
Type
Articles
Information
Journal of Materials Research , Volume 22 , Issue 5 , May 2007 , pp. 1339 - 1345
Copyright
Copyright © Materials Research Society 2007

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