Hydrogen Storage in Nanocrystalline Mg Powders
Conventional polycrystalline MgH2 was ball-milled under hydrogen atmosphere Afterwards 2 mol % pre-milled Nb2O5 (∼ 40 nm) was added to the MgH2 as a catalyst and the milling was continued. The effect of the milling duration and microstructure on the temperature of hydrogen desorption and on the dehydriding kinetics of the ball-milled MgH2 + Nb2O5 powders was analyzed. In addition, taking into account the microstructural parameters, e.g. the median and variance of the log-normal grain-size distribution of MgH2 powders, the reaction kinetics can be modeled by introducing a multi-particle reaction function.
P.J. Szabó, T. Réti, T. Czigány
Á. Révész "Hydrogen Storage in Nanocrystalline Mg Powders", Materials Science Forum, Vol. 589, pp. 149-154, 2008