Environmental Engineering Reference
In-Depth Information
In summary, the effects of adding small amounts of dopants have been high-
lighted and briefly discussed. The mechanism and nature of these catalysts is still
relatively unclear, however, with the development of new kinetic models, and the
incorporation of theoretical analysis, a deeper understanding of these catalysts is
on the horizon. Clearly, the catalysts play an important role in multiple steps of the
hydrogen sorption process, and with more research, proper utilization of these
catalysts may make the practicality of Mg nanostructures for hydrogen storage, a
potentially realizable goal.
5 Conclusions and Outlook
Bulk Mg itself is not likely to be a viable hydrogen storage material due to the
slow kinetics at ambient temperatures and pressures. However, there are strong
indications from experiments as well as theory that nanostructured magnesium
particles doped with low percentages of other elements spanning the periodic table
exhibit enhanced kinetics at lower temperature, but efficient hydrogenation and
dehydrogenations at room temperature is a goal that has still not been achieved.
Significant challenges in the field are structurally characterizing the doped mate-
rials effectively, so that an iterative loop between synthesis, structural character-
ization, evaluation of kinetics, and modeling can be achieved.
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