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Hydrogen is a promising alternative energy carrier that can potentiallyfacilitate the transition from fossil fuels to sources of clean energy becauseof its prominent advantages such as high energy density (142 MJ per kg), greatvariety of potential sources (for example water, biomass, organic matter), andlow environmental impact (water is the sole combustion product). However, dueto its light weight, the efficient storage of hydrogen is still an issueinvestigated intensely. Various solid media have been considered in thatrespect among which magnesium hydride stands out as a candidate offeringdistinct advantages. Recent theoretical work indicates that MgH2 becomes lessthermodynamically stable as particle diameter decreases below 2 nm. Our DFT(density functional theory) modeling studies have shown that the smallestenthalpy change, corresponding to 2 unit-cell thickness (1.6 {\AA} Mg/3.0{\AA}MgH2) of the film, is 57.7 kJ/molMg. This enthalpy change is over 10 kJ permolMg smaller than that of the bulk. It is important to note that the range ofenthalpy change for systems that are suitable for mobile storage applicationsis 15 to 24 kJ permolH at 298 K. The important key for the development ofair/stable Mg/nanocrystals is the use of PMMA (polymethylmethacrylate) as anencapsulation agent. In our work we use laser ablation, a non-electrochemicalmethod, for producing well dispersed nanoparticles without the presence of anylong range aggregation. The observed improved hydrogenation characteristics ofthe polymer/stable Mg-nanoparticles are associated to the preparation procedureand in any case the polymer laser ablation is a new approach for the productionof air/protected and inexpensive Mg/nanoparticles.

Polymer Stable Magnesium Nanocomposites Prepared by Laser Ablation for Efficient Hydrogen Storage