A combined pressure-temperature synthesis approach towards novel hydrogen storage materials

There is a growing need to explore synthesis of novel hydrogen storage materials with very high hydrogen content ($>$ 30 wt.{\%}) as well as tuning materials in order to facilitate reversible hydrogen desorption and absorption. A combined pressure-temperature ($P-T)$ approach holds considerable promise towards achieving these objectives. In this talk, we will present results from our on-going efforts to synthesize hydrogen clathrates with very high hydrogen content that can be recovered at moderate $P-T$ conditions based on simple molecular systems including clathrates and van der Waals compounds, specifically H$_{2}$O, CH$_{4}$, NH$_{3}$, and boron containing systems. The use of suitable additives to enhance stability will also be explored. Results will also be presented from the direct $P-T$ synthesis of metastable light metal (Li, Mg, B- based) complex hydrides.