reduced. This has also resulted in ever increasing environmental issues. A possible answer might be found in using clean fuels such as hydrogen. Currently, US Department of Energy (DoE) targets for the year 2010 aim at 6 wt.% of hydrogen stored on system level. Presently, energy densities achieved by commercial Metal-Hydrides reach only 1.2 wt.%. Furtherdevelopment of new lightweight hydrogen storage materials, based on magnesium or carbon, can provide a possible route to highergravimetrical storage capacities. The research described in this work shows that magnesium-based alloys show excellent reversible and fast hydrogen storage properties with capacities up to 6.7 wt.%. This makes these materials very promising candidates when considering applications where hydrogen storage plays an important role. The described in-depth investigation should help shed some light on this new and exciting field of lightweight materials, and should be especially useful to professionals in academic and research environments.

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