Combining density functional theory and cluster expansion methods to predict H2 permeance through Pd-based binary alloy membranes

The Journal of Chemical Physics
Lymarie Semidey-Flecha, David S Sholl

Abstract

First-principles calculations offer a useful complement to experimental approaches for characterizing hydrogen permeance through dense metal membranes. A challenge in applying these methods to disordered alloys is to make quantitative predictions for the net solubility and diffusivity of interstitial H based on the spatially local information that can be obtained from first-principles calculations. In this study, we used a combination of density functional theory calculations and a cluster expansion method to describe interstitial H in alloys of composition Pd96M4, where M=Ag, Cu, and Rh. The cluster expansion approach highlights the shortcomings of simple lattice models that have been used in the past to study similar systems. We use Sieverts' law to calculate H solubility and a kinetic Monte Carlo scheme to find the diffusivity of H in PdAg, PdCu, and PdRh alloys at a temperature range of 400<or=T<or=1200 K. From these results, we are able to predict the permeability of hydrogen through membranes made from these Pd-based binary alloys.

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Citations

Jul 2, 2009·The Journal of Chemical Physics·Shiqiang Hao, David S Sholl
Apr 2, 2009·The Journal of Chemical Physics·Jeong Woo HanDavid S Sholl
Dec 14, 2012·Physical Chemistry Chemical Physics : PCCP·Luis A ManceraAxel Gross
May 14, 2016·Molecules : a Journal of Synthetic Chemistry and Natural Product Chemistry·Adolfo IulianelliAngelo Basile
Jun 18, 2014·Accounts of Chemical Research·Kelly M NicholsonDavid S Sholl
Dec 20, 2016·ACS Applied Materials & Interfaces·Shahrouz NayebossadriDavid Book
Mar 18, 2009·Journal of Physics. Condensed Matter : an Institute of Physics Journal·Shiqiang HaoDavid S Sholl
Sep 28, 2010·Physical Review Letters·Daniele StradiStefan T Bromley

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