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Energies 2015, 8(9), 9173-9190; doi:10.3390/en8099173

Combined X-ray and Raman Studies on the Effect of Cobalt Additives on the Decomposition of Magnesium Borohydride

1
Physics Department, Institute for Energy Technology, P.O. Box 40, Kjeller NO-2027, Norway
2
Department of Chemistry, Centre for Nanostructured Interfaces and Surfaces (NIS), National Interuniversity Consortium of Materials Science and Technology (INSTM), University of Turin, Via P. Giuria 7, Turin 10125, Italy
3
Science and Technology Department, University of Insubria, Via Valleggio 11, Como 22100, Italy
4
Department of Physical and Colloid Chemistry, I.F. National University of Lviv, 6 Kyryla and Mefodia Str., Lviv UA-79005, Ukraine
5
SINTEF Materials & Chemistry, Trondheim NO-7465, Norway
*
Author to whom correspondence should be addressed.
Academic Editor: Craig M. Jensen
Received: 24 July 2015 / Revised: 18 August 2015 / Accepted: 19 August 2015 / Published: 27 August 2015
(This article belongs to the Special Issue Hydrides: Fundamentals and Applications)
View Full-Text   |   Download PDF [3169 KB, uploaded 27 August 2015]   |  

Abstract

Magnesium borohydride (Mg(BH4)2) is one of the most promising hydrogen storage materials. Its kinetics of hydrogen desorption, reversibility, and complex reaction pathways during decomposition and rehydrogenation, however, present a challenge, which has been often addressed by using transition metal compounds as additives. In this work the decomposition of Mg(BH4)2 ball-milled with CoCl2 and CoF2 additives, was studied by means of a combination of several in-situ techniques. Synchrotron X-ray diffraction and Raman spectroscopy were used to follow the phase transitions and decomposition of Mg(BH4)2. By comparison with pure milled Mg(BH4)2, the temperature for the γ → ε phase transition in the samples with CoF2 or CoCl2 additives was reduced by 10–45 °C. In-situ Raman measurements showed the formation of a decomposition phase with vibrations at 2513, 2411 and 766 cm−1 in the sample with CoF2. Simultaneous X-ray absorption measurements at the Co K-edge revealed that the additives chemically transformed to other species. CoF2 slowly reacted upon heating till ~290 °C, whereas CoCl2 transformed drastically at ~180 °C. View Full-Text
Keywords: cobalt additives; hydrogen storage; in-situ; magnesium borohydride (Mg(BH4)2); X-ray absorption spectroscopy (XAS); synchrotron X-ray diffraction cobalt additives; hydrogen storage; in-situ; magnesium borohydride (Mg(BH4)2); X-ray absorption spectroscopy (XAS); synchrotron X-ray diffraction
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Zavorotynska, O.; Deledda, S.; Vitillo, J.G.; Saldan, I.; Guzik, M.N.; Baricco, M.; Walmsley, J.C.; Muller, J.; Hauback, B.C. Combined X-ray and Raman Studies on the Effect of Cobalt Additives on the Decomposition of Magnesium Borohydride. Energies 2015, 8, 9173-9190.

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