MgH2-based nanocomposites prepared by short-time high energy ball milling followed by cold rolling: A new processing route
A new processing route consisting of a short-time high energy ball milling (HEBM) step followed by cold rolling (CR) to produce MgH2-based nanocomposites was investigated. Samples of pure MgH2 and MgH2-mixtures containing 2 mol% of FeF3 were processed under air atmosphere and their effects on the mi...
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Published in | International journal of hydrogen energy Vol. 39; no. 9; pp. 4404 - 4413 |
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Main Authors | , , , , |
Format | Journal Article |
Language | English |
Published |
Kidlington
Elsevier Ltd
18.03.2014
Elsevier |
Subjects | |
Online Access | Get full text |
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Summary: | A new processing route consisting of a short-time high energy ball milling (HEBM) step followed by cold rolling (CR) to produce MgH2-based nanocomposites was investigated. Samples of pure MgH2 and MgH2-mixtures containing 2 mol% of FeF3 were processed under air atmosphere and their effects on the microstructure and the hydrogen storage properties were studied in detail. X-ray Diffraction (XRD) analysis on all samples revealed crystallite sizes in the nanometer range for the beta-MgH2 and FeF3 phases (beta (beta): ∼8–13 nm and FeF3: ∼16–21 nm). No extra crystallite size reduction was observed for the HEBM + CR samples in comparison with those only cold rolled. Scanning electron microscopy (SEM) evaluation together with elemental composition analysis indicated a finer size distribution of additive particles and also a more intimate level of mixing for the HEBM + CR mixture than for the mixture obtained only by CR. These features were associated with the HEBM step applied before the CR. These characteristics led to a lower hydrogen desorption temperatures and enhanced desorption kinetics behavior for the HEBM + CR samples in comparison with the CR samples.
•A new processing route to produce MgH2-based nanocomposites is presented.•Low desorption temperature, very fast desorption kinetic behavior are reported.•Very fine additive particle size distribution and the better level of mixing are reported. |
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Bibliography: | ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23 |
ISSN: | 0360-3199 1879-3487 |
DOI: | 10.1016/j.ijhydene.2013.12.209 |