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Energies 2015, 8(11), 12546-12556;

Effect of Magnesium Fluoride on Hydrogenation Properties of Magnesium Hydride

Hydrogen Energy Centre, Department of Physics, Banaras Hindu University, Varanasi 221 005, India
Hydrogen Research Institute, Université du Québec à Trois-Rivières, Trois-Rivières, QC G9A 5H7, Canada
Institute for Advanced Materials Research, Hiroshima University, Higashi-Hiroshima 739-8530, Japan
Author to whom correspondence should be addressed.
Academic Editor: Craig M. Jensen
Received: 12 July 2015 / Revised: 11 October 2015 / Accepted: 15 October 2015 / Published: 4 November 2015
(This article belongs to the Special Issue Hydrides: Fundamentals and Applications)
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A cost effective catalyst is of great importance for consideration of MgH2 as potential hydrogen storage material. In this regard, we investigated the catalytic role of alkaline metal fluoride on the hydrogen storage behavior of MgH2. Samples were synthesized by admixing 5 mol % MgF2 into MgH2 powder using planetary ball mill. Hydrogenation measurements made at 335 °C showed that in comparison to only 70% absorption by pure MgH2, catalyzed material absorbed 92% of theoretical capacity in less than 20 min and desorbed completely in almost the same time. Sorption studies done at lower temperatures revealed that complete absorption at temperature as low as 145 °C is possible. This is due to uniform distribution of MgF2 nano particles within the MgH2 powder. X-ray diffraction patterns also showed the presence of stable MgF2 phase that does not decompose upon hydrogen absorption-desorption. Cyclic measurements done at 310 °C showed negligible loss in the overall storage capacity with cycling. These results reveal that the presence of the chemically inert and stable MgF2 phase is responsible for good reversible characteristic and improved kinetics. View Full-Text
Keywords: magnesium hydride; magnesium fluoride; hydrogen storage; metal hydrides; kinetics magnesium hydride; magnesium fluoride; hydrogen storage; metal hydrides; kinetics

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Jain, P.; Dixit, V.; Jain, A.; Srivastava, O.N.; Huot, J. Effect of Magnesium Fluoride on Hydrogenation Properties of Magnesium Hydride. Energies 2015, 8, 12546-12556.

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