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Metals 2017, 7(2), 34; doi:10.3390/met7020034

Improved Dehydrogenation Properties of 2LiNH2-MgH2 by Doping with Li3AlH6

1
Guangxi Key Laboratory of Information Materials, Guangxi Collaborative Innovation Center of Structure and Property for New Energy and Materials, School of Materials Science and Engineering, Guilin University of Electronic Technology, Guilin 541004, China
2
Key Laboratory of Advanced Energy Materials Chemistry (Ministry of Education), Nankai University, Tianjin 300071, China
*
Authors to whom correspondence should be addressed.
Academic Editor: Jacques Huot
Received: 5 December 2016 / Revised: 19 January 2017 / Accepted: 23 January 2017 / Published: 26 January 2017
(This article belongs to the Special Issue Metal Hydrides)
View Full-Text   |   Download PDF [4173 KB, uploaded 26 January 2017]   |  

Abstract

Doping with additives in a Li-Mg-N-H system has been regarded as one of the most effective methods of improving hydrogen storage properties. In this paper, we prepared Li3AlH6 and evaluated its effect on the dehydrogenation properties of 2LiNH2-MgH2. Our studies show that doping with Li3AlH6 could effectively lower the dehydrogenation temperatures and increase the hydrogen content of 2LiNH2-MgH2. For example, 2LiNH2-MgH2-0.1Li3AlH6 can desorb 6.43 wt % of hydrogen upon heating to 300 °C, with the onset dehydrogenation temperature at 78 °C. Isothermal dehydrogenation testing indicated that 2LiNH2-MgH2-0.1Li3AlH6 had superior dehydrogenation kinetics at low temperature. Moreover, the release of byproduct NH3 was successfully suppressed. Measurement of the thermal diffusivity suggests that the enhanced dehydrogenation properties may be ascribed to the fact that doping with Li3AlH6 could improve the heat transfer for solid–solid reaction. View Full-Text
Keywords: hydrogen storage; Li-Mg-N-H system; Li3AlH6; thermal diffusivity; ball milling; phase transformation hydrogen storage; Li-Mg-N-H system; Li3AlH6; thermal diffusivity; ball milling; phase transformation
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Qiu, S.; Ma, X.; Wang, E.; Chu, H.; Zou, Y.; Xiang, C.; Xu, F.; Sun, L. Improved Dehydrogenation Properties of 2LiNH2-MgH2 by Doping with Li3AlH6. Metals 2017, 7, 34.

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