The hydrogen permeability of Pd–Cu based thin film membranes in relation to their structure: A combinatorial approach. (16th March 2015)

• Record Type: Journal Article
• Authors: Westerwaal, R.J.; Bouman, E.A.; Haije, W.G.; Schreuders, H.; Dutta, S.; Wu, M.Y.; Boelsma, C.; Ngene, P.; Basak, S.; Dam, B.
• Is Part Of: International journal of hydrogen energy. Volume 40:Number 10(2015)
• Page Start: 3932
• Page End: 3943
• Publication Date: 2015-03-16
• Subjects: Hydrogen as fuel -- Periodicals; Hydrogène (Combustible) -- Périodiques; Hydrogen as fuel; Periodicals; 665.81
• DOI: 10.1016/j.ijhydene.2015.01.124
• Languages: English
• ISSNs: 0360-3199

Abstract

<abstract xml:lang="en" abstract-type="author" id="abs0010"> <title id="sectitle0010">Abstract</title> <sec> <p id="abspara0010">Pd–Cu is a well-known alloy for H₂ separation membranes. Using a new optical combinatorial method we determined the H₂ permeability of Pd–Cu alloys at room temperature in relation to their crystal structure and microstructure.</p> <p id="abspara0015">Compositional gradient samples allow us to determine the intrinsic permeability as a function of the alloy composition. From a detailed XRD, TEM and AFM analysis we find that the pure fcc and bcc phases have a very low permeability, whereas the mixed bcc/fcc phases show the highest permeability for thin film alloys prepared at higher temperatures. Therefore interstitial-bulk hydrogen diffusion is most probably not the main transport mechanism. Instead we argue that the hydrogen transport occurs mainly along the heterogeneous grain boundaries. As compared to the bulk phase diagram we find that the mixed bcc/fcc region in our Pd–Cu thin films is larger than reported in literature (ranging from 43 at% – 65 at% Pd at 483 K).</p> </sec> </abstract>