The effect of chromium (III) oxide (Cr2O3) nanopowder on the microstructure and cyclic hydrogen storage behavior of magnesium hydride (MgH2)

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

Abstract

High energy ball milling in a Fritsch P6 planetary ball mill was used for the synthesis of the nanocomposite of MgH2 with 10 wt.% of Cr 2O3 nanopowder catalyst (particle size <50 nm). After ball milling for 1 h the resulting grain size of β-MgH2 was equal to ∼30 nm. Subsequently, the nanocomposite was subjected to 150 desorption/absorption cycles at 325 °C. A gradual loss of hydrogen storage capacity upon cycling from ∼5.2 wt.% after 1 cycle to ∼4.6 wt.% after 150 cycles is observed on respective PCT curves obtained at 325 °C after every 25 cycles. The TPD curves temperature maxima are gradually shifted to a higher temperature range with increasing number of cycles which may indicate a lowering of the overall rate of transformation. Thorough microstructural investigations using such techniques as X-ray diffraction (XRD), scanning transmission electron microscopy (STEM) and X-ray photoelectron spectroscopy (XPS) of the samples after 150 cycles of desorption/absorption show profound microstructural changes such as sintering of individual powder particles into agglomerates, increase in grain/crystallite size (>100 nm), segregation of the Cr2O3 particles to the interfaces between the sintered Mg particles and some reduction of Cr2O3 to Cr and MgO. All these microstructural changes seem to be responsible for the reduction of hydrogen storage capacity upon cycling and lowering the overall rate of transformation. © 2010 Elsevier B.V. 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
, Marcin Pisarek - Institute of Physical Chemistry Polish Academy of Sciences (IChF PAN), MNiSW [80] [Polish Academy of Sciences (PAN)] [Warsaw University of Technology (PW), MNiSW [80]]
Marcin Pisarek,,
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- Politechnika Warszawska
Journal seriesJournal of Alloys and Compounds, ISSN 0925-8388, (A 35 pkt)
Issue year2011
Vol509
No5
Pages2386 - 2391
Publication size in sheets0.5
Keywords in EnglishBall milling; Chromium oxide (Cr2O3); Cycling; Magnesium hydride (MgH 2); Microstructure; Solid state hydrogen storage
ASJC Classification2505 Materials Chemistry; 2506 Metals and Alloys; 2210 Mechanical Engineering; 2211 Mechanics of Materials
DOIDOI:10.1016/j.jallcom.2010.11.026
URL https://www.scopus.com/inward/record.uri?eid=2-s2.0-78650733923&partnerID=40&md5=ec823907bfa8d255872cbadc6df8298d
Languageen angielski
File
The-effect-of-chromium--III--oxide--Cr2O3--nanopowder-on-t_2011_Journal-of-A.pdf 2.09 MB
Score (nominal)35
Score sourcejournalList
Publication indicators WoS Citations = 22; Scopus Citations = 24; Scopus SNIP (Source Normalised Impact per Paper): 2011 = 1.457; WoS Impact Factor: 2011 = 2.289 (2) - 2011=2.104 (5)
Citation count*28 (2019-12-28)
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