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Title:
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High throughput screening of Pd-alloys for H2 separation membranes studied by hydrogenography and CVM
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Author(s):
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Published by:
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Publication date:
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ECN
Biomass, Coal and Environmental Research
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4-11-2011
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ECN report number:
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Document type:
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ECN-W--11-057
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Article (scientific)
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Number of pages:
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10
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Published in: International Journal of Hydrogen Energy (Elsevier), , , Vol., p.-.
Abstract:
The search for and development of stable Pd-based membranes for hydrogen separation
applications with resistance to hydrogen embrittlement and cracking is a challenging and
time-consuming task. Membrane failure is most often caused by the occurrence of the aeb
phase transition during hydrogen absorption and desorption by the Pd-alloy below the
critical temperature. By finding a suitable alloy with a critical temperature below room
temperature, the membrane lifetime can be extended tremendously. Here we present
a combinatorial approach that enables the fast screening of phase transitions in multicomponent
Pd-alloys for hydrogen separation membranes by experiments and thermodynamic
calculations. The method is applied to the well-documented PdeCu alloy
compositions. Hydrogenography, a compositional gradient thin film technique, is used to
experimentally investigate the alloy compositions. Using a new phenomenological method
to determine the critical temperature from hydrogenography measurements, we show that
the experimental results and the calculations, using the Cluster Variation Method (CVM),
agree well with the phase boundaries and critical temperatures reported in literature. Our
results show that the combined capabilities of hydrogenography and CVM enable an efficient
screening of promising multi-component alloys for which thermodynamic data are
scarce or absent.
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