Rapid hydrogenation at 30 °c of magnesium (Mg) and iron (Fe) nanocomposite obtained through a decomposition of Mg2FeH6 precursor

M. Polanski , J. Bystrzycki , R.A. Varin , Tomasz Płociński

Abstract

A ternary Mg2FeH6 hydride was synthesized applying the processing route described in detail in [4]. Subsequently, a nanocomposite of 2Mg + Fe was produced through a thermal decomposition of Mg 2FeH6 precursor. Microstructural studies by SEM, STEM, EDS, EELS and XRD show a microstructure consisting of nanocrystalline nearly spherical Fe particles with an average diameter of 20-30 nm uniformly distributed in the nanocrystalline Mg matrix exhibiting the grain size on the order of 5-10 nm. The 2Mg + Fe nanocomposite was subsequently hydrogenated at 30 °C under 4 MPa of hydrogen pressure. After 10 h about 1.1 mass% of hydrogen has been absorbed but the pertinent desorption curve shows that the hydrogenation process is not saturated yet. Temperature programmed desorption (TPD) of hydrogenated 2 Mg + Fe sample shows an asymmetrical desorption peak with a tail extending from ∼130 to 200 °C, then sharp increase in the peak height and eventually a sudden drop around a maximum at ∼250 °C. This asymmetrical shape strongly suggests that a large population of nanocrystalline grains being in an intimate contact with the nanocrystalline particles of Fe which, most likely, act as a catalyst, is able to desorb hydrogen at very low temperatures from ∼130-250 °C under helium flow used in a TPD test. © 2010 Professor T. Nejat Veziroglu. Published by Elsevier Ltd. All rights reserved.
Author M. Polanski - [Wojskowa Akademia Techniczna]
M. Polanski,,
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, J. Bystrzycki - [Wojskowa Akademia Techniczna]
J. Bystrzycki,,
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, R.A. Varin - [University of Waterloo]
R.A. Varin,,
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, Tomasz Płociński (FMSE / DMD)
Tomasz Płociński,,
- Division of Materials Design
Journal seriesInternational Journal of Hydrogen Energy, ISSN 0360-3199, (A 35 pkt)
Issue year2011
Vol36
No1
Pages1059 - 1065
Publication size in sheets0.5
Keywords in EnglishDehydrogenation; Hydrogenation at 30 °C; Magnesium-iron nanocomposite; Microstructure; Ternary Mg2FeH6 hydride
ASJC Classification2102 Energy Engineering and Power Technology; 3104 Condensed Matter Physics; 2103 Fuel Technology; 2105 Renewable Energy, Sustainability and the Environment
DOIDOI:10.1016/j.ijhydene.2010.08.146
URL https://www.scopus.com/inward/record.uri?eid=2-s2.0-78650755399&partnerID=40&md5=fbbc039e22ea45bae775e0b6ea394843
Languageen angielski
File
Rapid-hydrogenation-at-30--C-of-magnesium--Mg--and-iro_2011_International-Jo.pdf 1.51 MB
Score (nominal)35
Score sourcejournalList
Publication indicators WoS Citations = 17; Scopus Citations = 16; Scopus SNIP (Source Normalised Impact per Paper): 2011 = 1.829; WoS Impact Factor: 2011 = 4.054 (2) - 2011=4.402 (5)
Citation count*17 (2020-01-31)
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