Is high weight H intake in pseudobinaries still an option?

Pseudobinary intermetallic compounds constituted the backbone of hydrogen storage research for tens of years. This is because they present versatile hydrogenation properties, and some of them form reversible hydrides under moderate hydrogen pressures near room temperature. However, a current limit of about 2% hydrogen weight causes a shift of the research interest to other hydrogen absorbers. We overview here the conditions and the factors, determining hydrogen absorption in intermetallic compounds. A special attention is given to recently found differentiation and divergence of elastic properties in intermetallics upon pseudobinary substitution. The possibility to form superior intermetallic compound for hydrogen storage is considered.