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In this study, the modification of the desorption behavior of LiAlH 4  by the addition of K 2 NbF 7  was explored for the first time. The addition of K 2 NbF 7  causes a notable improvement in the desorption behavior of LiAlH 4 . Upon the addition of 10 wt.% of K 2 NbF 7 , the desorption temperature of LiAlH 4  was significantly lowered. The desorption temperature of the LiAlH 4  + 10 wt.% K 2 NbF 7  sample was lowered to 90°C (first-stage reaction) and 149°C (second-stage reaction). Enhancement of the desorption kinetics performance with the LiAlH 4  + 10 wt.% K 2 NbF 7  sample was substantiated, with the composite sample being able to desorb hydrogen 30 times faster than did pure LiAlH 4 . Furthermore, with the presence of 10 wt.% K 2 NbF 7 , the calculated activation energy values for the first two desorption stages were significantly reduced to 80 and 86 kJ/mol; 24 and 26 kJ/mol lower than the as-milled LiAlH 4 . After analysis of the X-ray diffraction result, it is believed that the  in situ  formation of NbF 4 , LiF, and K or K-containing phases that appeared during the heating process promoted the amelioration of the desorption behavior of LiAlH 4  with the addition of K 2 NbF 7 .

Influence of K2NbF7 Catalyst on the Desorption Behavior of LiAlH4