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Pulsed Laser Deposition of PdCuAu Alloy Membranes for Hydrogen Absorption Study

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journal contribution
posted on 25.11.2015, 00:00 by J. Galipaud, M. H. Martin, L. Roué, D. Guay
Finding suitable binary and ternary alloys for hydrogen purification membranes remains a challenge due to the vast compositional range to be studied. In this context, we proposed a new combination of alloy fabrication (as thin film) by pulsed laser deposition (PLD) and subsequent hydrogen solubility characterization by electrochemical in situ X-ray diffraction (E in situ XRD) able to rapidly screen alloys in a broad range of compositions. In this study, we demonstrated the capabilities of this new technique on the PdCuAu system. A FCC solid solution was formed in the full explored composition range (Pd = 15–100 at. %, Cu = 0–80 at. %, Au = 0–30 at. %). Structural reorganization, relieving some strain in the lattice, was observed during the first electrochemical hydrogen–dehydrogenation cycles. Using E in situ XRD to study the hydrogen solubility of PdCuAu alloys, we confirmed that the Pd content in the alloy is the primary parameter driving hydrogen solubility. Replacing Cu with Au slightly enhanced the hydrogen solubility of PdCuAu.