Abstract
Sodium alanate (NaAlH4) is a promising complex metal hydride due to its reasonable hydrogen storage capacity (7.4 wt %). However, the pristine NaAlH4 suffers from the inherent limitations of unfavorable thermodynamics (high desorption temperature), slow kinetics, and poor reversibility. In the present work, the efficacy of Nb2O5, TiO2, and Cr2O3 nanoparticles in ameliorating hydrogen sorption properties of NaAlH4 was evaluated. The use of Nb2O5 and TiO2 displayed superior catalytic effects in terms of enhancing dehydriding/rehydriding kinetics and reducing the dehydrogenation temperature of NaAlH4. Isothermal volumetric measurements at 150 °C revealed that kinetics of hydrogen desorption with Nb2O5 and TiO2 were almost 11–12 times that of pristine NaAlH4. The apparent activation energy as well as enthalpy of dehydrogenation were considerably lowered by addition of Nb2O5 and TiO2 nanopowders. Moreover, the pronounced enhancement on hydrogen capacity arising upon adding Nb2O5 and TiO2 was observed to persis...
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