Effects of Hydrogen on Metallic Materials
New metastable alloys with amorphous, nanocrystalline or quasicrystalline structures are very interesting targets for hydrogen sorption studies. This is mainly attributed to their unique atomic arrangements and their particular compositions, e.g. of early and late transition metals, which give rise to unusual absorption mechanisms and often to a faster hydrogen diffusivity as compared to their microcrystalline counterparts. Due to their limited thermal stability hydrogen absorption and desorption processes are restricted to low temperatures, i.e. mainly to electrochemical charging and discharging. Nevertheless, the understanding of the effect of electrochemically charged hydrogen on the phase stability and thermally induced phase transition reactions is of deep fundamental interest (link to Teresiak!). Selected alloys with high electrochemical hydrogen absorption capacity are discussed as new materials for reversible room temperature hydrogen storage under the pre-condition that a high cyclic stability can be obtained.
Examples of recent investigations are: