The Role of the Thermodynamic Factor in Hydrogen Diffusion in Metal and Alloy Membranes

Abstract:

The role of the thermodynamic factor in determining the magnitude of Ficks diffusion constant, DH, for H in metals and alloys is discussed using mainly Pd and its fcc alloys as examples because data are available for some of these systems over a wide range of H contents. Procedures are given for obtaining DH*, the concentration-independent diffusion constant, from DH under permeation conditions where the H concentration varies through the membrane; which is the common situation for H₂ purification membranes where p_upstream >> p_downstream. The role of the thermodynamic factor in H diffusion through multi-layer membranes will also be discussed.

• Periodical: Defect and Diffusion Forum (Volume 349)
• Pages: 1-23
• DOI: https://doi.org/10.4028/www.scientific.net/DDF.349.1
• Online since: January 2014
• Authors: Ted B. Flanagan
• Keywords: Alloy Membrane, Fick’s Law, Hydrogen Diffusion, Hydrogen Permeation, Thermodynamic Factor

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