Hydrogen-storage materials dispersed into nanoporous substrates studied through incoherent inelastic neutron scattering

► Densities of phonon states in some infiltrated H-storage materials are measured. ► Signatures induced by the infiltration process on NaAlH4 phonon bands are detected. ► Weaker modifications are found in MgH2 and NH3BH3, mainly in the low-energy region. ► No relevant effect has been observed in LiBH4 + Mg(BH4)2.