ICAMS / Interdisciplinary Centre for Advanced Materials Simulation


First-principles based modeling of hydrogen permeation through Pd–Cu alloys

L. Qin, C. Jiang.

International Journal of Hydrogen Energy, 37, 12760-12764, (2012)

The solubility and diffusivity of hydrogen in disordered fcc Pd1−xCux alloys are investigated using a combination of first-principles calculations, a composition-dependent local cluster expansion (CDLCE) technique, and kinetic Monte Carlo simulations. We demonstrate that a linear CDCLE model can accurately describe interstitial H in fcc Pd1−xCux alloys over the entire composition range (0 ≤ x ≤ 1) with accuracy comparable to that of direct first-principles calculations. Our predicted H solubility and permeability results are in reasonable agreement with experimental measurements. The proposed model is quite general and can be employed to rapidly and accurately screen a large number of alloy compositions for potential membrane applications. Extension to ternary or higher-order alloy systems should be straightforward. Our study also highlights the significant effect of local lattice relaxations on H energetics in size-mismatched disordered alloys, which has been largely overlooked in the literature.

Keyword(s): hydrogen permeability; membrane; cluster expansion; first-principles calculation; kinetic Monte Carlo
DOI: 10.1016/j.ijhydene.2012.06.029
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