The hydrogen permeability of Pd-Cu based thin film membranes in relation to their structure: A combinatorial approach

R. J. Westerwaal*, E. A. Bouman, W. G. Haije, H. Schreuders, S. Dutta, M. Y. Wu, C. Boelsma, P. Ngene, S. Basak, B. Dam

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

Abstract

Pd-Cu is a well-known alloy for H-2 separation membranes. Using a new optical combinatorial method we determined the H-2 permeability of Pd-Cu alloys at room temperature in relation to their crystal structure and microstructure. 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). Copyright (C) 2015, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.

Original languageEnglish
Pages (from-to)3932-3943
Number of pages12
JournalInternational Journal of Hydrogen Energy
Volume40
Issue number10
DOIs
Publication statusPublished - 16 Mar 2015
Externally publishedYes

Keywords

  • Hydrogen permeability
  • Hydrogen membrane
  • Combinatorial method
  • Pd-Cu phase diagram
  • Structure
  • COPPER-PALLADIUM ALLOYS
  • COMPOSITE MEMBRANES
  • SEPARATION
  • DIFFUSION
  • PERMEATION
  • FLUX
  • TRANSPORT
  • NICKEL
  • H-2
  • TRANSFORMATION

Fingerprint

Dive into the research topics of 'The hydrogen permeability of Pd-Cu based thin film membranes in relation to their structure: A combinatorial approach'. Together they form a unique fingerprint.

Cite this