Magnesium–carbon hydrogen storage hybrid materials produced by reactive ball milling in hydrogen

Time-resolved studies uncovered kinetics and mechanism of Mg–hydrogen interactions during High energy reactive ball milling in hydrogen (HRBM) in presence of various types of carbon, including graphite (G), activated carbon (AC), multi-wall carbon nanotubes (MWCNT), expandable (EG) and thermally-exp...

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Bibliographic Details
Published in:Carbon (New York) 2013-06, Vol.57, p.146-160
Main Authors: Lototskyy, M., Sibanyoni, J.M., Denys, R.V., Williams, M., Pollet, B.G., Yartys, V.A.
Format: Article
Language:English
Subjects:
Adsorbents
Alternative fuels. Production and utilization
Applied sciences
Chemistry
Colloidal state and disperse state
Cross-disciplinary physics: materials science
rheology
Energy
Exact sciences and technology
Fuels
General and physical chemistry
Hydrogen
Materials science
Nanoscale materials and structures: fabrication and characterization
Nanotubes
Physical and chemical studies. Granulometry. Electrokinetic phenomena
Physics
Surface physical chemistry
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Summary:Time-resolved studies uncovered kinetics and mechanism of Mg–hydrogen interactions during High energy reactive ball milling in hydrogen (HRBM) in presence of various types of carbon, including graphite (G), activated carbon (AC), multi-wall carbon nanotubes (MWCNT), expandable (EG) and thermally-expanded (TEG) graphite. Introduction of carbon significantly changes the hydrogenation behaviour, which becomes strongly dependent on the nature and amount of carbon additive. For the materials containing 1wt.% AC or TEG, and 5wt.% MWCNT, the hydrogenation becomes superior to that for the individual magnesium and finishes within 1h. Analysis of the data indicates that carbon acts as a carrier of the “activated” hydrogen by a mechanism of spill-over. For Mg–G the hydrogenation starts from an incubation period and proceeds slower. An increase in the content of EG and TEG above 1wt.% results in the deterioration of the hydrogenation kinetics. The effect of carbon additives has roots in their destruction during the HRBM to form graphene layers encapsulating the MgH2 nanoparticles and preventing the grain growth. This results in an increase of absorption–desorption cycle stability and a decrease of the MgH2 crystallite size in the re-hydrogenated Mg–C hybrid materials (40–125nm) as compared to Mg alone (180nm).
ISSN:0008-6223
1873-3891
DOI:10.1016/j.carbon.2013.01.058