YMgGa as a hydrogen storage compound

Journal Article · Wed Jul 15 00:00:00 EDT 2009 · Journal of Solid State Chemistry

DOI:https://doi.org/10.1016/j.jssc.2009.04.029· OSTI ID:21370490

Sahlberg, Martin ^[1]; Zlotea, Claudia; Moretto, Pietro ^[2]; Andersson, Yvonne ^[1]

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1. Department of Materials Chemistry, Uppsala University Box 538, SE-75121 Uppsala (Sweden)
2. Institute for Energy, Joint Research Centre, European Commission, P.O. Box 2, NL-1755 Petten (Netherlands)

The hydrogen absorption and desorption properties of the recently found ternary phase YMgGa have been studied. This compound absorbs 2.2 wt% hydrogen during the first cycle, but only 1.1 wt% can be stored reversibly for the following cycles under the applied pressure and temperature conditions. Hydrogen absorption and desorption properties were investigated by measuring the thermal desorption spectra and the pressure-composition isotherms while the crystal structure was determined using X-ray diffraction (XRD). The compound absorbs hydrogen at pressures above 0.2 MPa and 250 deg. C by decomposing into YH{sub 3} and MgGa. This reaction is reversed when heating the hydride in a He atmosphere; hydrogen is released and the YMgGa phase is partially recovered together with YGa{sub 2} and YH{sub 2}. The reformation of YMgGa occurs at temperatures below 450 deg. C on the expenses of hydrogen desorption from YH{sub 2}. This is not expected under these temperature conditions as YH{sub 2} normally does not desorb hydrogen below 800 deg. C. - Graphical abstract: Hydrogen absorption in YMgGa studied by in situ powder X-ray diffraction. The hydrogen absorption and desorption properties were investigated by thermal desorption spectra and pressure-composition isotherms.

• OSTI ID: 21370490
• Journal Information: Journal of Solid State Chemistry, Vol. 182, Issue 7; Other Information: DOI: 10.1016/j.jssc.2009.04.029; PII: S0022-4596(09)00190-X; Copyright (c) 2009 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; ISSN 0022-4596
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
ABSORPTION
CRYSTAL STRUCTURE
DESORPTION
GALLIUM ALLOYS
HEATING
HYDROGEN
HYDROGEN STORAGE
INTERMETALLIC COMPOUNDS
ISOTHERMS
MAGNESIUM ALLOYS
MAGNESIUM HYDRIDES
POWDERS
PRESSURE RANGE KILO PA
SPECTRA
TEMPERATURE RANGE 0400-1000 K
X-RAY DIFFRACTION
YTTRIUM HYDRIDES
ALKALINE EARTH METAL COMPOUNDS
ALLOYS
COHERENT SCATTERING
DIFFRACTION
ELEMENTS
HYDRIDES
HYDROGEN COMPOUNDS
MAGNESIUM COMPOUNDS
NONMETALS
PRESSURE RANGE
SCATTERING
SORPTION
STORAGE
TEMPERATURE RANGE
TRANSITION ELEMENT COMPOUNDS
YTTRIUM COMPOUNDS