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The present research work is focused on the effect of activation procedure onthe hydrogen absorption-desorption properties of new rare earth transitionmetal compound based on Sm(Co0.6Fe0.2Zr0.16B0.04)7.5 composition. Crystalstructure and composition is always connected to the maximum capacity of theintermetallic hydrides. For composite materials the thermodynamic properties ofhydrogenation & dehydrogenation procedure are mostly explained throughmicrostructure-microchemistry characteristics. Efficient hydrogen storage isdirect connected to the desorbed hydrogen amount. The as hydrogenated materialSm(Co0.6Fe0.2Zr0.16B0.04)7.5 seems to have in the desorption a pressure plateaubelow the atmospheric pressure at room temperature while the absorbed hydrogenalmost remains in the material having capacity of ~0.8 wt. % at 0.1 MPa - 30oC. After the proper activation procedure, the hydrogenated material desorbsvery high amount of hydrogen ~1.9 wt. % at 0.1 MPa - 100 oC. Subsequently, thetreatment of the composite materials before hydrogenation & dehydrogenationprocedures could play a crucial role on the efficiency.

Effect of activation procedure on Sm-Co-Fe-Zr-B compound for low temperature efficient hydrogen storage