In light of global warming and shrinking fossil fuel supplies there is a need for alternative environment-friendly energy carriers for heat, electricity and mobility. Hydrogen is the most promising and effective candidate for this purpose. However, especially for the mobile application there is a still ongoing search for a storage material that provides both high H2 storage density and good H2 sorption properties
In this project metallic nanoparticles are prepared by intert gas condensation and characterized by TEM techniques. The goal is the application of MgH2 or AlH3 nanoparticles as solid state hydrogen storage media. Owing to their nanoscopic dimensions, enhanced storage properties are expected in comparison with bulk materials. On the one hand, extremely short diffusion lengths of hydrogen are expected to promote the reaction kinetics during hydrogenation and de-hydrogenation. On the other hand size effects as predicted by DFT calculations should allow for a reduced the decomposition temperature where the hydrogen is released. Whereas enhanced reaction kinetics have been achieved for nanostructured MgH2, AlH3 nanoparticles could not yet be synthesized, and the experimental proof of size effects is still lacking.
The goal of the project is to modify the material properties such that the requirements for the mobile application such as the reversible hydrogen storage in cars are met.