%0 book part
%@ 
%A Dornheim, M., Klassen, T.

%D 2009
%J Encyclopedia of Electrochemical Power Sources

%P 459-472 
%R doi:10.1016/B978-044452745-5.00326-9
%T FUELS – HYDROGEN STORAGE - High Temperature Hydrides
%U https://doi.org/10.1016/B978-044452745-5.00326-9
 
%X In this article, recent developments in the field of high-temperature hydrides are discussed with a special focus on MgH2 as a model system. Light-weight hydrides offer high gravimetric storage capacities for hydrogen. However, most of them are too stable for reversible hydrogen storage applications. In addition, reaction kinetics is mostly too sluggish: filling a tank could take several hours. The adoption of high-energy ball milling techniques for achieving nanocrystalline microstructures as well as the discovery of effective and cost-efficient catalysts led to a breakthrough. Moreover, the approach of the reactive hydride composites opens up a way to tailor reaction enthalpies of high-temperature hydrides. Upon desorption, constituents of these different hydrides reversibly react with each other to form a rather stable compound, thus reducing the total reaction enthalpy by the formation enthalpy of the new compound. Using this approach, the range of potential applications of high-temperature hydrides is significantly extended.