Tuning the Decomposition Temperature in Complex Hydrides:Synthesis of a Mixed Alkali Metal Borohydride

摘要

Metal borohydrides continue to attract considerable interest as potential hydrogen storage materials owing to their very large gravimetric hydrogen densities.In terms of the equally important performance parameter,the thermal decomposition temperature T_(des),it has emerged that the degree of charge transfer between the metal cation and the BH_4~- anion is a key component for any ultimate materials design.Although manipulation of T_(des) in single-cation borohydrides is clearly limited by the intrinsic properties of the individual metal (its characteristic electronegativity,for example),double and multiple cation substitution allows more extensive and precise control of T_(des).