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Effect of the Process Parameters on the Energy Transfer during the Synthesis of the 2LiBH4-MgH2 Reactive Hydride Composite for Hydrogen Storage

1
Institute of Materials Research, Helmholtz-Zentrum Geesthacht, 21502 Geesthacht, Germany
2
Institute of Materials Technology, Helmut Schmidt University, 22043 Hamburg, Germany
3
Department of Physicochemistry of Materials, Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Centro Atómico Bariloche, R8402AGP S.C. de Bariloche, Argentina
4
Pavia H2 Lab, Department of Chemistry, Physical Chemistry Division, University of Pavia, 27100 Pavia, Italy
*
Author to whom correspondence should be addressed.
Metals 2019, 9(3), 349; https://doi.org/10.3390/met9030349
Received: 22 February 2019 / Revised: 12 March 2019 / Accepted: 16 March 2019 / Published: 19 March 2019
(This article belongs to the Special Issue Metals in Hydrogen Technology)
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Abstract

Several different milling parameters (additive content, rotation velocity, ball-to-powder ratio, degree of filling, and time) affect the hydrogen absorption and desorption properties of a reactive hydride composite (RHC). In this paper, these effects were thoroughly tested and analyzed. The milling process investigated in such detail was performed on the 2LiH-MgB2 system doped with TiCl3. Applying an upgraded empirical model, the transfer of energy to the material during the milling process was determined. In this way, it is possible to compare the obtained experimental results with those from processes at different scales. In addition, the different milling parameters were evaluated independently according to their individual effect on the transferred energy. Their influence on the reaction kinetics and hydrogen capacity was discussed and the results were correlated to characteristics like particle and crystallite size, specific surface area, presence of nucleation sites and contaminants. Finally, an optimal value for the transferred energy was determined, above which the powder characteristics do not change and therefore the RHC system properties do not further improve. View Full-Text
Keywords: hydrogen storage; LiBH4/MgH2; metal hydrides; borohydrides; reactive hydride composites; high-energy milling hydrogen storage; LiBH4/MgH2; metal hydrides; borohydrides; reactive hydride composites; high-energy milling
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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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Jepsen, J.; Capurso, G.; Puszkiel, J.; Busch, N.; Werner, T.; Milanese, C.; Girella, A.; Bellosta von Colbe, J.; Dornheim, M.; Klassen, T. Effect of the Process Parameters on the Energy Transfer during the Synthesis of the 2LiBH4-MgH2 Reactive Hydride Composite for Hydrogen Storage. Metals 2019, 9, 349.

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