Fully reversible hydrogen absorption and desorption reactions with Sc(Al{sub 1-x}Mg{sub x}), x=0.0, 0.15, 0.20

Journal Article · Sat Jan 15 04:00:00 EST 2011 · Journal of Solid State Chemistry

DOI:https://doi.org/10.1016/j.jssc.2010.10.034· OSTI ID:21494178

Sahlberg, Martin ^[1]; Zlotea, Claudia; Latroche, Michel ^[2]; Andersson, Yvonne ^[1]

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1. Department of Materials Chemistry, The Angstroem Laboratory, Uppsala University, Box 538, SE-751 21 Uppsala (Sweden)
2. Institut de Chimie et des Materiaux-Paris Est, CNRS UMR 7182, 94320 Thiais (France)

The hydrogen storage properties of Sc(Al{sub 1-x}Mg{sub x}), x=0.0, 0.15, 0.20, have been studied by X-ray powder diffraction, thermal desorption spectroscopy, pressure-composition-isotherms and scanning electron microscopy techniques. Hydrogen is absorbed from the gas phase at 70 kPa and 400 {sup o}C under the formation of ScH{sub 2} and aluminium with magnesium in solid solution. The reaction is fully reversible in vacuum at 500 {sup o}C and shows the hydrogenation-disproportionation-desorption-recombination (HDDR) behaviour. The activation energy of desorption was determined by the Kissinger method to 185 kJ/mol. The material is stable up to at least six absorption-desorption cycles and there is no change in particle size during cycling. -- Graphical abstract: XRD pattern of Sc(Al{sub 1-x}Mg{sub x}). From the top: x=0, 0.15, 0.20. The hydrogen absorption properties were studied by thermal desorption spectroscopy, pressure-composition-isotherms and scanning electron microscopy techniques. Display Omitted

• OSTI ID: 21494178
• Journal Information: Journal of Solid State Chemistry, Journal Name: Journal of Solid State Chemistry Journal Issue: 1 Vol. 184; ISSN 0022-4596; ISSN JSSCBI
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
ABSORPTION
ACTIVATION ENERGY
ALLOYS
ALUMINIUM ALLOYS
CHEMICAL REACTIONS
COHERENT SCATTERING
DESORPTION
DIFFRACTION
DISPERSIONS
ELECTRON MICROSCOPY
ELEMENTS
ENERGY
HOMOGENEOUS MIXTURES
HYDRIDES
HYDROGEN
HYDROGEN COMPOUNDS
HYDROGEN STORAGE
HYDROGENATION
INTERMETALLIC COMPOUNDS
ISOTHERMS
MAGNESIUM ALLOYS
MICROSCOPY
MIXTURES
NONMETALS
PARTICLE SIZE
PRESSURE RANGE
PRESSURE RANGE KILO PA
SCANDIUM ALLOYS
SCANNING ELECTRON MICROSCOPY
SCATTERING
SIZE
SOLID SOLUTIONS
SOLUTIONS
SORPTION
SPECTROSCOPY
STORAGE
TEMPERATURE RANGE
TEMPERATURE RANGE 0400-1000 K
TRANSITION ELEMENT ALLOYS
X-RAY DIFFRACTION