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Hydrogen Spillover Mechanism on a Pd-Doped Mg Surface as Revealed by ab initio Density Functional Calculation.

The hydrogenation kinetics of Mg is slow, impeding its application for mobile hydrogen storage. We demonstrate by ab initio density functional theory (DFT) calculations that the reaction path can be greatly modified by adding transition metal catalysts. Contrasting with Ti doping, a Pd dopant will r...

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Published in:Journal of the American Chemical Society Vol. 129; no. 33; pp. 10201 - 10205
Main Authors: Du, A. J., Smith, Sean C., Yao, X. D., Lu, G. O.
Format: Article
Published: American Chemical Society 8/22/2007
Subjects:
Hydrogen
Palladium
Magnesium
Density functionals
Surface chemistry
Online Access:View this record in EBSCOhost
Summary:The hydrogenation kinetics of Mg is slow, impeding its application for mobile hydrogen storage. We demonstrate by ab initio density functional theory (DFT) calculations that the reaction path can be greatly modified by adding transition metal catalysts. Contrasting with Ti doping, a Pd dopant will result in a very small activation barrier for both dissociation of molecular hydrogen and diffusion of atomic H on the Mg surface. This new computational finding supports—for the first time by ab initio simulation—the proposed hydrogen spillover mechanism for rationalizing experimentally observed fast hydrogenation kinetics for Pd-capped Mg materials.