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In this investigation, the as-milled Mg 85 Zn 5 Ni 10 -4C (C = TiF 3 , NbF 5 ) composites were successfully produced via ball milling. The different influences between the catalysts TiF 3 and NbF 5 on the hydrogen storage behavior and microstructure of the composites were investigated by XRD, SEM, TEM and hydrogen absorption/desorption tests. The as-milled Mg 85 Zn 5 Ni 10 -4C (C = TiF 3 , NbF 5 ) alloys contain the major phase Mg, the secondary phase Mg 2 Ni, a small amount of MgZn 2 , TiF 3 and NbF 5 . After hydrogenation, MgH 2 and Mg 2 NiH 4 are formed, which convert back into Mg and Mg 2 Ni after dehydrogenation indicating that MgZn 2 and the catalysts TiF 3 and NbF 5 do not react with hydrogen. Compared with NbF 5 catalyzed alloy, the TiF 3 catalyzed alloy has a faster hydrogen absorption/desorption kinetics. On the basis of Arrhenius equation, the dehydrogenation activation energy values of the as-milled Mg 85 Zn 5 Ni 10 -4C (C = TiF 3 , NbF 5 ) alloys are 75.514 and 82.367 kJ mol -1 H 2 , respectively, while the value of ball-milled Mg 85 Zn 5 Ni 10 alloy is 109.830 kJ mol -1 H 2 . As a result, both TiF 3 and NbF 5 can significantly ameliorate the hydrogen storage thermodynamics. TiF 3 shows better catalytic influence on hydrogen storage property of Mg 85 Zn 5 Ni 10 than NbF 5 .

rsc advances

A comparison of TiF3 and NbF5 catalytic effects on hydrogen absorption and desorption kinetics of a ball-milled Mg85Zn5Ni10 alloy