Hostname: page-component-6b989bf9dc-g5k2d Total loading time: 0 Render date: 2024-04-13T20:41:29.802Z Has data issue: false hasContentIssue false

Mechanochemical synthesis of a Mg-Li-Al-H complex hydride

Published online by Cambridge University Press:  31 January 2011

Jing Zhang*
Affiliation:
College of Materials Science and Engineering, Chongqing University, Chongqing 400044, China
Fusheng Pan
Affiliation:
College of Materials Science and Engineering, Chongqing University, Chongqing 400044, China
*
a) Address all correspondence to this author. e-mail: jingzhang@cqu.edu.cn
Get access

Abstract

Mg-Li-Al alloy was prepared by ingot casting and then underwent subsequent reactive ball milling. A Mg-Li-Al-H complex hydride was obtained under a 0.4 MPa hydrogen atmosphere at room temperature, and as high as 10.7 wt% hydrogen storage capacity was achieved, with the peak desorption temperature of the initial step at approximately 65 °C. The evolution of the reaction during milling, as well as the effect of Li/Al ratio in the raw materials on the desorption properties of the hydrides formed, were studied by x-ray diffraction and simultaneous thermogravimetry and differential scanning calorimetry techniques. The results showed that mechanical milling increases the solubility of Li in Mg, leading to the transformation of bcc β(Li) solid solution to hcp α(Mg) solid solution, the latter continues to incorporate Li and Al, which stimulates the formation of Mg-Li-Al-H hydride. A lower Li/Al ratio resulted in faster hydrogen desorption rate and a greater amount of hydrogen released at a low temperature range, but sacrificing total hydrogen storage capacity.

Type
Articles
Copyright
Copyright © Materials Research Society 2009

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

1Zaluska, A., Zaluska, L. and Strom-Olsen, J.O: Nanocrystalline magnesium for hydrogen storage. J. Alloys Compd. 288, 217 (1999)CrossRefGoogle Scholar
2Sakintuna, B., Lamari-Darkrim, F. and Hirscher, M.: Metal hydride materials for solid hydrogen storage: A review. Int. J. Hydrogen Energy 32, 1121 (2007)CrossRefGoogle Scholar
3Barkhordarian, G., Klassen, T. and Bormann, R.: Fast hydrogen sorption kinetics of nanocrystalline Mg using Nb2O5 as catalyst. Scr. Mater. 49, 213 (2003)CrossRefGoogle Scholar
4Aguey-Zinsou, K.F, Fernandez, J.R Ares, Klassen, T. and Bormann, R.: Effect of Nb2O5 on MgH2 properties during mechanical milling. Int. J. Hydrogen Energy 32, 2400 (2007)CrossRefGoogle Scholar
5Huhn, P.A, Dornheim, M., Klassen, T. and Bormann, R.: Thermal stability of nanocrystalline magnesium for hydrogen storage. J. Alloys Compd. 404–406, 499 (2005)CrossRefGoogle Scholar
6Hanada, N., Ichikawa, T. and Fujii, H.: Catalytic effect of niobium oxide on hydrogen storage properties of mechanically ball milled MgH2. Physica B (Amsterdam) 383, 49 (2006)CrossRefGoogle Scholar
7Zheng, X.L, Xiong, Z.T and Qin, S.: Dehydrogenation of LiAlH4in HMPA. Int. J. Hydrogen Energy 33, 3346 (2008)CrossRefGoogle Scholar
8Zheng, X.P, Qu, X.H, Humail, I.S, Li, P. and Wang, G.Q: Effects of various catalysts and heating rates on hydrogen release from lithium alanate. Int. J. Hydrogen Energy 32, 1141 (2007)CrossRefGoogle Scholar
9Fichtner, M., Engel, J. and Fuhr, O.: Nanocrystalline aluminium hydrides for hydrogen storage. Mater. Sci. Eng., B 108, 42 (2004)CrossRefGoogle Scholar
10Zaluski, L., Zaluska, A. and StröOlsen, J.O: Hydrogenation properties of complex alkali metal hydrides fabricated by mechano-chemical synthesis. J. Alloys Compd. 290, 71 (1999)CrossRefGoogle Scholar
11Mamatha, M., Bogdanovic, B. and Felderhoff, M.: Mechanochemical preparation and investigation of properties of magnesium, calcium and lithium–magnesium alanates. J. Alloys Compd. 407, 78 (2006)CrossRefGoogle Scholar
12Schlapbach, L. and Züttel, A.: Hydrogen for novel materials and devices. Nature 414, 353 (2001)CrossRefGoogle Scholar
13Vittetoe, A.W, Niemann, M.U, Srinivasan, S.S, McGrath, K., Kumar, A., Goswami, D.Y, Stefanakos, E.K and Thomas, S.: Destabilization of LiAlH4 by nanocrystalline MgH2. Int. J. Hydrogen Energy 34, 2333 (2009)CrossRefGoogle Scholar
14Goto, Y., Kakuta, H. and Kamegawa, A.: High-pressure synthesis of novel hydride in Mg–M systems. J. Alloys Compd. 404–406, 448 (2005)CrossRefGoogle Scholar
15Tang, X. and Opalka, S.M: Hydrogen storage properties of Na– Li–Mg–Al–H complex hydrides. J. Alloys Compd. 446–447, 228 (2007)CrossRefGoogle Scholar
16Zhu, X., Schoenitz, M. and Dreizin, E.L: Mechanically alloyed Al–Li powders. J. Alloys Compd. 432, 111 (2007)CrossRefGoogle Scholar
17Varin, R.A, Chiu, C.H and Czujko, T.: Feasibility study of the direct mechano-chemical synthesis of nanostructured magnesium tetrahydroaluminate (alanate) [Mg(AlH4)2] complex hydride. Nanotechnology 16, 2261 (2005)CrossRefGoogle Scholar
18Young, R.A: The Rietveld Method, 1st ed. (Oxford University Press, Oxford, England, 1993), p. 1.CrossRefGoogle Scholar
19Jensen, J.A and Chumbley, L.S: Processing and mechanical properties of magnesium-lithium composites containing steel fibers. Metall. Mater. Trans. A 29, 863 (1998)CrossRefGoogle Scholar
20Kazakov, A.A, Timonova, M.A and Borisova, L.G: Properties of Magnesium-Lithium Alloys, No. 9, 1st ed. (Plenum Publishing Corp., New York, 1983), p. 5.Google Scholar
21Zhang, J., Yan, W., Bai, C., Pan, F.: Hydrogenation transformations in magnesium alloyed with Li and Al. (Submitted).Google Scholar
22Dolotko, O., Zhang, H.Q, Ugurlu, O., Wiench, J.W, Pruski, M., Chumbley, L.S and Pecharsky, V.: Mechanochemical transformations in Li(Na)AlH4–Li(Na)NH2 systems. Acta Mater. 55, 3121 (2007)Google Scholar
23Sterlin-Leo-Hudson, M., Pukazhselvan, D., Irene-Sheeja, G. and Srivastava, O.N: Studies on synthesis and dehydrogenation behavior of magnesium alanate and magnesium–sodium alanate mixture. Int. J. Hydrogen Energy 32, 4933 (2007)CrossRefGoogle Scholar
24Løvvik, O.M and Molin, P.N: Density-functional band-structure calculations of magnesium alanate Mg(AlH4)2. Phys. Rev. B 72, 073201 (2005)CrossRefGoogle Scholar