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Microstructural Analysis of Dehydrogenation Products of the Ca(BH4)2–MgH2 Composite

Published online by Cambridge University Press:  06 August 2013

Jong-Min Kim
Affiliation:
Advanced Analysis Center, Korea Institute of Science and Technology, Seoul 136-791, Republic of Korea
Yoonyoung Kim
Affiliation:
High Temperature Energy Materials Research Center, Korea Institute of Science and Technology, Seoul 136-791, Republic of Korea
Jae-Hyeok Shim
Affiliation:
High Temperature Energy Materials Research Center, Korea Institute of Science and Technology, Seoul 136-791, Republic of Korea
Young-Su Lee
Affiliation:
High Temperature Energy Materials Research Center, Korea Institute of Science and Technology, Seoul 136-791, Republic of Korea
Jin-Yoo Suh*
Affiliation:
High Temperature Energy Materials Research Center, Korea Institute of Science and Technology, Seoul 136-791, Republic of Korea
Jae-Pyoung Ahn
Affiliation:
Advanced Analysis Center, Korea Institute of Science and Technology, Seoul 136-791, Republic of Korea
Gyeung-Ho Kim
Affiliation:
Advanced Analysis Center, Korea Institute of Science and Technology, Seoul 136-791, Republic of Korea
Young Whan Cho
Affiliation:
High Temperature Energy Materials Research Center, Korea Institute of Science and Technology, Seoul 136-791, Republic of Korea
*
*Corresponding author. E-mail: jinyoo@kist.re.kr
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Abstract

The microstructural analysis of the dehydrogenation products of the Ca(BH4)2–MgH2 composite was performed using transmission electron microscopy. It was found that nanocrystalline CaB6 crystallites formed as a dehydrogenation product throughout the areas where the signals of Ca and Mg were simultaneously detected, in addition to relatively coarse Mg crystallites. The uniform distribution of the nanocrystalline CaB6 crystallites appears to play a key role in the rehydrogenation of the dehydrogenation products, which implies that microstructure is a crucial factor determining the reversibility of reactive hydride composites.

Type
Research Article
Copyright
Copyright © Microscopy Society of America 2013 

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References

Barkhordarian, G., Klassen, T., Dornheim, M. & Bormann, R. (2007). Unexpected kinetic effect of MgB2 in reactive hydride composites containing complex borohydrides. J Alloy Compd 440(1-2), L18L21.Google Scholar
Bösenberg, U., Doppiu, S., Mosegaard, L., Barkhordarian, G., Eigen, N., Borgschulte, A., Jensen, T.R., Cerenius, Y., Gutfleisch, O., Klassen, T., Dornheim, M. & Bormann, R. (2007). Hydrogen sorption properties of MgH2–LiBH4 composites. Acta Mater 55(11), 39513958.Google Scholar
Kim, J.H., Jin, S.A., Shim, J.H. & Cho, Y.W. (2008a). Reversible hydrogen storage in calcium borohydride Ca(BH4)2. Scr Mater 58(6), 481483.Google Scholar
Kim, J.H., Shim, J.H. & Cho, Y.W. (2008b). On the reversibility of hydrogen storage in Ti- and Nb-catalyzed Ca(BH4)2. J Power Sources 181(1), 140143.Google Scholar
Kim, Y., Reed, D., Lee, Y.S., Lee, J.Y., Shim, J.H., Book, D. & Cho, Y.W. (2009). Identification of the dehydrogenated product of Ca(BH4)2. J Phys Chem C 113(14), 58655871.Google Scholar
Kim, Y., Reed, D., Lee, Y.-S., Shim, J.-H., Han, H.N., Book, D. & Cho, Y.W. (2010). Hydrogenation reaction of CaH2–CaB6–Mg mixture. J Alloy Compd 492(1-2), 597600.Google Scholar
Orimo, S.I., Nakamori, Y., Eliseo, J.R., Zuttel, A. & Jensen, C.M. (2007). Complex hydrides for hydrogen storage. Chem Rev 107(10), 41114132.Google Scholar
Rongeat, C., D'Anna, V., Hagemann, H., Borgschulte, A., Züttel, A., Schultz, L. & Gutfleisch, O. (2010). Effect of additives on the synthesis and reversibility of Ca(BH4)2. J Alloy Compd 493(1-2), 281287.Google Scholar
Vajo, J.J., Skeith, S.L. & Mertens, F. (2005). Reversible storage of hydrogen in destabilized LiBH4. J Phys Chem B 109(9), 37193722.Google Scholar