How intimate contact with nanoporous carbon benefits the reversible hydrogen desorption from NaH and NaAlH_4

摘要

The kinetics and thermodynamics for the reversible hydrogen desorption from NaH (and NaH derived from NaAlH_4) are greatly improved by nanosizing and providing close contact to a porous carbon matrix.rnMetal hydrides are promising candidates for compact on-board storage of hydrogen.However, no metal hydride system so far meets all requirements, as slow kinetics, high thermodynamic stability of the hydride and/or reversibility issues hamper practical application. It is expected that nanosizing and confining a material can improve the kinetics of the hydrogenation and dehydrogenation reactions, limit phase segregation and particle growth, and might influence the thermodynamic properties of the system.