Issue 16, 2013
From the journal:

Journal of Materials Chemistry A

Understanding the role of K in the significantly improved hydrogen storage properties of a KOH-doped Li–Mg–N–H system†

Chu Liang,a   Yongfeng Liu,*a   Mingxia Gaoa  and  Hongge Pan*a  

* Corresponding authors

a State Key Laboratory of Silicon Materials, Key Laboratory of Advanced Materials and Applications for Batteries of Zhejiang Province & Department of Materials Science and Engineering, Zhejiang University, Hangzhou 310027, China
E-mail: mselyf@zju.edu.cn, hgpan@zju.edu.cn
Fax: +86 571 87952615
Tel: +86 571 87952615

Abstract

In this paper, we report a KOH-doped Mg(NH2)2–2LiH system with low operating temperatures and good cycling stability. The Mg(NH2)2–2LiH–0.07KOH sample can reversibly desorb/absorb ∼4.92 wt% hydrogen with a starting and peak dehydrogenation temperature of ∼75 °C and ∼120 °C, respectively, the lowest in the current Mg(NH2)2–2LiH system studied. Moreover, the cycling stability of de-/hydrogenation is also remarkably improved by KOH doping as the average capacity degradation of the Mg(NH2)2–2LiH–0.07KOH system is of only 0.002 wt% per cycle within 30 cycles. Detailed structural investigations reveal that during ball milling, the doped KOH can react with Mg(NH2)2 and LiH to convert to MgO, KH and Li2K(NH2)3, which work together to provide the synergistic effects of thermodynamics and kinetics on hydrogen desorption and absorption of the Mg(NH2)2–2LiH system upon heating, consequently inducing a significant improvement in hydrogen storage properties.

Graphical abstract: Understanding the role of K in the significantly improved hydrogen storage properties of a KOH-doped Li–Mg–N–H system

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Article information

DOI
https://doi.org/10.1039/C3TA01071F
Article type
Paper
Submitted
12 Nov 2012
Accepted
20 Feb 2013
First published
11 Mar 2013

J. Mater. Chem. A, 2013,1, 5031-5036

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Understanding the role of K in the significantly improved hydrogen storage properties of a KOH-doped Li–Mg–N–H system

C. Liang, Y. Liu, M. Gao and H. Pan, J. Mater. Chem. A, 2013, 1, 5031 DOI: 10.1039/C3TA01071F

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