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Mechanical synthesis of magnesium alloys for hydrogen storage

Contreras Vásquez, Luis Felipe (2018)
Ph.D. thesis, University of Birmingham.

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Abstract

In this work, synthesis, characterisation and hydrogen sorption properties of MgH2, Mg-Li alloy, NaMgH3, Li substitution in NaMgH3, Ca-Mg-H, and Li/Na substitution into Ca-Mg-H ternary systems have been investigated. Samples were ball milled under Ar or H2 for 2, 5, 10 or 15 h; then characterized by X-ray diffraction (XRD), Raman Spectroscopy, differential scanning calorimetry (DSC), thermogravimetric analysis coupled with a mass spectrometer (TGA-MS). The compositional changes and reversibility were investigated using in-situ XRD.

The X-ray intensities decreased with increasing milling, which corresponds to a reduction in crystallinity. For the first time, the effect of ball milling on the Raman of MgH2 was studied. For Mg-Li no formation of LiMgH3, Li2MgH4 was observed. NaMgH3 was synthesized after 2 h milling in Ar. DSC-TGA-MS showed H2 desorption occurs in 2 steps with a total mass loss of 5.9 wt. % H2 at 359 °C. Substituting Li in NaMgH3 led to a decrease in desorption temperature of about 50 °C when 0.5 mol (Li) was added. However, the total mass loss was decreased to 5.1 wt % H2. Ca-Mg-H and Li/Na substitutions into the ternary hydride showed desorption temperatures between 300 °C and 385°C with a maximum of 3.5 wt.% H2 released.

Type of Work:Ph.D. thesis.
Supervisor(s):Book, David
School/Faculty:Colleges (2008 onwards) > College of Engineering & Physical Sciences
Department:Metallurgy and Materials
Additional Information:

Publications resulting from research:

Vasquez, L. F. C., Liu, Y., Paterakis, C., Reed, D., & Book, D. (2017). Hydrogen sorption properties of LixNa1-xMgH3 (x= 0, 0.2, 0.5 & 0.8). International Journal of Hydrogen Energy.
https://doi.org/10.1016/j.ijhydene.2017.03.041

Liu, Y., Reed, D., Paterakis, C., Vasquez, L. C., Baricco, M., & Book, D. (2017). Study of the decomposition of a 0.62 LiBH 4–0.38 NaBH 4 mixture. International Journal of Hydrogen Energy.
https://doi.org/10.1016/j.ijhydene.2017.03.141

Paterakis, C., Guo, S., Heere, M., Liu, Y., Contreras, L. F., Sørby, M. H., ... & Book, D. (2017). Study of the NaBH 4–NaBr system and the behaviour of its low temperature phase transition. International Journal of Hydrogen Energy.
https://doi.org/10.1016/j.ijhydene.2017.03.045

Subjects:TJ Mechanical engineering and machinery
Institution:University of Birmingham
ID Code:8302
This unpublished thesis/dissertation is copyright of the author and/or third parties. The intellectual property rights of the author or third parties in respect of this work are as defined by The Copyright Designs and Patents Act 1988 or as modified by any successor legislation. Any use made of information contained in this thesis/dissertation must be in accordance with that legislation and must be properly acknowledged. Further distribution or reproduction in any format is prohibited without the permission of the copyright holder.
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