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Hydrogen absorption/desorption properties of the Sc(AlxNi1-x)2 system
Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Materials Chemistry, Inorganic Chemistry.
2011 (English)Independent thesis Advanced level (professional degree), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

Sc(AlxNi1-x)2 is a pseudobinary C14 Laves phase and a potential interstitial hydrogen storage material or anode in a Ni-MH battery. A previous study showed that Sc1Al1Ni1 can store hydrogen reversibly; both interstitially and trough decomposition into ScH2 and AlNi. It is also known that the exact composition is very important for the hydrogen storage properties of pseudobinary Laves phases. This thesis work is aimed at synthesising Sc(AlxNi1-x)2 and study the effect of the Ni/Al ratio on the hydrogen absorption/desorption process as well as the interstitial storage capacity. Compositions with high nickel content had the highest capacity (at least 0.67wt% for ScAl0.66Ni1.34) and ones with high aluminium content had the lowest total storage capacity (0wt% for ScAl1.28Ni0.62). The former composition was also shown to absorb and desorb hydrogen during multiple cycles. Desorption of interstitial hydrogen from ScAl0.66Ni1.34 requires 4.6kJ/mol in activation energy.

Place, publisher, year, edition, pages
2011. , 28 p.
Series
UPTEC K, ISSN 1650-8297 ; 11005
Keyword [en]
hydrogen storage, Laves phases, Ni-MH batteries, intermetallic compounds, alloy, alloys, Nickel, Hydrogen, Scandium, Sc, Ni, Aluminium, Aluminum, Al, Nickel metal hydride batteries, Laves phase
Keyword [sv]
vätelagrning, Lavesfaser, Ni-MH batteri, intermetalliska föreningar, legering, legeringar, nickel, väte, skandium, aluminium, Lavesfas
National Category
Metallurgy and Metallic Materials
Identifiers
URN: urn:nbn:se:uu:diva-159372OAI: oai:DiVA.org:uu-159372DiVA: diva2:444565
Subject / course
Material
Educational program
Master Programme in Chemical Engineering
Uppsok
Technology
Supervisors
Examiners
Available from: 2011-10-14 Created: 2011-09-29 Last updated: 2011-10-14Bibliographically approved

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