Mechanochmical Synthesis of a Mg-Al-H Complex Hydrides

Abstract:

Magnesium hydride is considered as one of the most interesting alternatives for the reversible storage of hydrogen. In this study,The feasibility and reaction process of different materials（Mg and pretreated Al powders(mainly composed of Al and Ni)）were discussed and investigated by thermodynamic calculation. The effects of material proportioning, mill time, mill energy density were also investigated by XRD analysis and TG-DSC technique, and analyzed the essence mechanism. The results show that nano-sized MgH2 and Mg(AlH4)2 could be directly synthesized by pure Mg and pretreated Al powder, The product composite hydrides release 2.7wt% H2 through multi-step decompositions, of which the starting endothermic peaks are as low as 265°C.

• Periodical: Applied Mechanics and Materials (Volume 248)
• Pages: 274-279
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.248.274
• Online since: December 2012
• Authors: Xiao Dong Luo, Jing Zhang, Hao Liu
• Keywords: Hydrogen Storage Materials, Mechanochmical Synthesis, Mg(AlH₄)₂, MgH₂, Thermodynamic Calculation

References

[1] Bogdanović B, Hartwig T H, Spliethoff B. The development, testing and optimization of energy storage materials based on the MgH2--Mg system. International Journal of Hydrogen Energy 1575-589, 8(1993).

DOI: 10.1016/0360-3199(93)90178-d

[2] L. Shaw,R. Ren,T. Markmaitree, W. Osborn, Effects of mechanical activation on drhydrogenation of the lithium amide and hydride. Sci. 263-271, 448(2008).

DOI: 10.1016/j.jallcom.2006.10.029

[3] Graetz J, Reilly JJ. Kinetically stablilized hydrogen storage materials. Scr Materialia. 835-9, 56(2007).

DOI: 10.1016/j.scriptamat.2007.01.007

[4] Hu L X, Wang E D. Hydrogen generation via hydrolysis of nanocrystalline MgH2 and MgH2-based composites. Trans. Nonferrous Met. Soc. China, 965-970., 15(2005).

[5] Liang G, Huot J, Boily S, et al. Catalytic effect of transition metals on hydrogen sorption in nanocrystalline ball milled MgH-Tm (Tm5Ti, V, Mn, Fe and Ni) systems. Journal of Alloys and Compounds. 247-252, 292(1999).

DOI: 10.1016/s0925-8388(99)00442-9

[6] Nakamori Y, Ninomiya A, Kitahara G, Aoki M, Noritake T, Miwa K. et al. Dehydriding reactions of mixed complex hydrides. Journal of Power and sources. 155: 447-55, 155(2006).

DOI: 10.1016/j.jpowsour.2005.04.013

[7] Hisscher M, Becher M, Halusha M, von Zeppelin F, Chen XH, Dettlaff-Weglikowska U, et al. Are carbon nanostructures an efficient hydrogen storage medium. Journal of Alloys and Comp. 433-7, 56(2003).

DOI: 10.1016/s0925-8388(03)00142-7

[8] Ichikawa T, Chen DM, Isobe S, Gomibuchi E, Fujii H. Hydrogen storage properties on mechanically milled grahite. Mat Sci Eng B-Solid. 138-42, 108(2004).

DOI: 10.1016/j.mseb.2003.10.094

[9] Zaluska A, Zaluski L. New cataylic complexes for metal hydride systems. Journal of Alloys and Compds. 706-11, 406(2005).

DOI: 10.1016/j.jallcom.2005.03.104

[10] L. Narayanan, D. Angela, D. Lueking. Mechanically milled coal and magnesium composites for hydrogen storage. Carbon. 65-48, 206(2006).

DOI: 10.1016/j.carbon.2006.11.017

[11] M. Conte, P.P. Prosini, S. Passerini. Overview of energy/hydrogen storage: state-of-the-art of the technologies and prospects for nanomaterials Materials Science and Engineering B. 2–8, 108(2004).

DOI: 10.1016/j.mseb.2003.10.107