Berlin 2005 – scientific programme
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M: Metallphysik
M 4: Wasserstoff in Metallen
M 4.2: Talk
Friday, March 4, 2005, 10:45–11:00, TU H2038
Hydrogen absorption of Na-Li alanates prepared by ball-milling — •RYOTA GEMMA1, HARU-HISA UCHIDA1, ASTRID PUNDT2, and REINER KIRCHHEIM2 — 1Dept. of Human Development, Tokai University, 259-1292, Kitakaname, Hiratsuka, Kanagawa, Japan — 2Institut für Materialphysik, Friedrich-Hund-Platz 1, D-37077, Göttingen, Germany
In recent years, complex hydrides based on Na, Li and Al have been of interest for hydrogen storage because of their high hydrogen capacity at around 3-5wt%. In this study Na2LiAlH6 prepared by ball-milling was investigated by determining its P-C-T property which has not been well introduced up to now. The extrapolation of the vant Hoff plot of plateau pressures showed the possibility of reversible sorption reaction at around room temperature. But, the high apparent activation energy of 110-130 kJ/molH2 in the absorption was found to be appropriate for middle temperature use. An appropriate mixing of rare-earth oxides powder in the course of milling enhanced the reaction rate. This was interpreted by increased specific surface by finely dispersed oxides.