The effect of alkaline earth metals (Magnesium and Calcium) on Hydrogen storage efficiency of alanate nanopowders

Document Type : Reasearch Paper

Author

Department of Material Engineering and Metallurgy, Faculty of Engineering2, IAU-Shiraz Branch, P. O. Box 74731-71987, Shiraz, Iran.

Abstract

Different Aluminum: alkaline earth metal atomic weight ratios effects on structure transformations in alanates nanopowders were studied. Changes in crystal structures from alane to alanates by increasing alkaline earth metals dopants in the mixture with slight changes in crystal structures from rhombohedral centered – trigonal (alane) to trigonal (magnesium alanate), and monoclinic (calcium alanate), while thermal behavior alters from one step dissociation at ~150 ْC with ~ 8.1 wt% hydrogen release in alane to the two steps hydrogen releases in magnesium alanate at 130 and 285 ْC with 7 and 2.1 wt% changes, and to the three steps hydrogen releases in calcium alanate at 127, 260, and 328 ْC with 1.7, 2.1, and 4 wt% changes were indicated. Residual phases after dissociation are formed in aluminum and magnesium alloying systems and intermetallic phases like Mg2Al3 and Mg17Al12 with no sign of oxide formation and pure aluminum, Al4Ca, Al2Ca intermetallic phases and Ca in aluminum: Calcium system.

Keywords

Main Subjects

References

[1] Bououdina M., Grant D., Walker G., (2006), Review on hydrogen absorbing materials-structure, microstructure, and thermodynamic properties. Int. J. Hydr. Energy. 31: 177-182.
[2] Sakintuna B., Lamari-Darkrim F., Hirscher M, (2007), Metal hydride materials for solid hydrogen storage: A review. Int. J. Hyd. Energy. 32: 1121-1140.
[3] George L., Saxena K., (2010), Structural stability of metal hydrides, alanates and borohydrides of alkali and alkali- earth elements: A review. Int. J. Hydr. Energy. 35: 5454-5470.
[4] Jain I. P., Jain P., Jain A., (2010), Novel hydrogen storage materials: A review of lightweight complex hydrides. J. Alloys Compd. 503: 303-339.
[5] Mamatha M., Bogdanovi B., Felderhoff M., Pommerin A., Schmidt W., Sch ̈uth F., Weidenthaler C., (2006), Mechanochemical preparation and investigation of properties of magnesium, calcium and lithium–magnesium alanates. J. Alloys Compd. 407: 78-86.
[6] Sartori S., Istad-Lem A., Hendrik W., (2009), Mechano-chemical synthesis of alane. Int. J. Hydr. Energy. 34: 6350-6356.
[7] Fossdal A., Brinks H. W., Fichtner M. Hauback B. C., (2005), Determination of the crystal structure of Mg(AlH4)2 by combined X-ray and neutron diffraction. J. Alloys Compd. 387: 47-51.
[8] Paskevicius M., Sheppard D. A., Buckley C. E., (2009), Characterization of mechanochemically synthesized alane nanoparticles. J. Alloys Compd. 487: 370-376.
[9] Kumar S., Kain V., Kojima Y., (2017), Remarkably improved dehydrogenation of ZrCl4 doped NaAlH4 for hydrogen storage application. Int. J. Hydr. Energy. 42: 15299-15307.
[10] Pommerin A., Weidenthaler C., Schuth F., (2010), Direct synthesis of pure complex aluminium hydrides by cryomilling. Scripta Materialia. 62: 576–588.
[11] Yang C., Chen T., Tatsai W., (2012), Synergistic hydrogen desorption behavior of magnesium aluminum hydride synthesized by mechano-chemical activation method. J. Alloys Compd. 525: 126-132.
[12] Hosseinabadi N., Sarraf-mamoory S., Kaleji B. K., (2010), Synthesis, phase study and magnetic characterization of Co50Fe40Cu10 ternary alloy nanopowders prepared by mechanochemical alloying process. Powder Metall. 53: 260-264.
[13] Pommerin A., Weidenthaler C., Schuth F., (2010), Influence of the ball milling conditions on the preparation of rare earth aluminum hydrides. Scripta Materialia. 63: 1128-1131.
[14] Fossdal A., Brinks H. W., Fichtner M., Hauback B. C., (2005), Thermal decomposition of Mg(AlH4)2 studied by in-situ synchrotron X-ray diffraction. J. Alloys Compd. 404–406: 752-756.
[15] Iosub V., Matsunaga T., Tange K., Ishikiriyama M., Miwa K., (2009), Synthesis of the hydride mixtures (1−x)AlH3/xMgH2 (0≤x≤0.3) by ball milling and their hydrogen storage properties. J. Alloys Compd. 484: 426-430.
[16] Iosub V., Matsunaga T., Tange K., Ishikiriyama M., (2009), Direct synthesis of Mg(AlH4)2 and CaAlH5 crystalline compounds by ball milling and their potential as hydrogen storage materials. Int. J. Hydr. Energy. 34: 906-912.
[17] Liang F., Lin J., Wu Y. M., Wang L. M., (2017), Enhanced electrochemical hydrogen storage performance of TieVeNi composite employing NaAlH4. Int. J. Hydr. Energy. 42: 14633-14640.
[18] Sato T., (Timmy) Ramirez-Cuesta A. J., Ikeda K., Orimo Sh., Yamada K.,  (2011), Vibrational properties of CaAlH5 and r-AlH3 with different AlH6 networks studied by inelastic neutron scattering. Inorg. Chem. 50: 8007-8011.
[19] Kumar S. Jain A., Miyaoka H., Ichikawa T., Kojima Y., (2017), Catalytic effect of bis (cyclopentadienyl) nickel II on the improvement of the hydrogenation dehydrogenation of Mg-MgH2 system. Int. J. Hydr. Energy. 42: 17178-17183.
[20] Cheetham A. K., (1995), The rietveld method, edited by R.A. Young, oxford: oxford unvpress.
International Journal of Nano Dimension
Volume 9, Issue 1
Winter 2018
Pages 41-57

Files

Share

How to cite

Statistics