Structure and hydrogen storage properties of the hexagonal Laves phase Sc(Al1-xNix)2

The crystal structures of hydrogenated and unhydrogenated Sc(Al 1-xNi x) 2 Laves phases have been studied by combining several diffraction techniques and it is shown that hydrogen is situated interstitially in the A 2B 2-sites, which have the maximum number of scandium neighbours. The hydrogen absorption/desorption behaviour has also been investigated. It is shown that a solid solution of hydrogen forms in the mother compound. The hydrogen storage capacity exceeds 1.7 H/f.u. at 374 K, and the activation energy of hydrogen desorption was determined to 4.6 kJ/mol H 2. It is shown that these compounds share the same local coordination as Frank-Kasper-type approximants and quasicrystals, which opens up the possibility of finding many new hydride phases with these types of crystal structures.

Ångström, JonasUppsala universitet,Oorganisk kemi(Swepub:uu)jonan616 (författare)
Zlotea, Claudia (författare)
Beran, Premsyl (författare)
Latroche, Michel (författare)
Pay Gómez, CeasarUppsala universitet,Strukturkemi(Swepub:uu)cespa665 (författare)
Uppsala universitetOorganisk kemi (creator_code:org_t)

Ingår i:Journal of Solid State Chemistry: Elsevier BV196, s. 132-1370022-45961095-726X

Av författaren/redakt...: Sahlberg, Martin; Ångström, Jonas; Zlotea, Claudia; Beran, Premsyl; Latroche, Michel; Pay Gómez, Ceasa ...

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