Hydrogen solubility in PdCuAg ternary alloy films prepared by electrodeposition

Tosques, Jacques; Martin, M.; Roué, Lionel; Guay, Daniel

doi:10.1016/j.ijhydene.2014.06.168

Cited by 9 publications

(3 citation statements)

References 39 publications

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“…The measured lattice constants of the here prepared samples agree within 0.3% with predictions of eq except for M4 which deviates by almost 0.6%. Lattice constants reported for PdCuAg membranes fabricated by sputtering and ELP and PdCuAg thin films prepared by electrodeposition agree similarly well with Vegard’s law (Figure ). Deviations of that magnitude from Vegard’s law have been also observed for electrodeposited PdCuAu thin films and PdCu thin films prepared by laser deposition .…”

Section: Resultssupporting

confidence: 74%

“…Deviations of that magnitude from Vegard's law have been also observed for electrodeposited PdCuAu thin films 32 and PdCu thin films prepared by laser deposition. 33 Guay and co-workers attributed the differences in the asprepared alloys to lattice strain caused by growth-related structural deformations 31,33 and lattice deformations imposed by the differing atom sizes. 32 The metal atom radii 34 of Ag (1.445 Å) and Au (1.442 Å) are practically identical, so that Ag and Au incorporation should lead to comparable deformations of PdCu crystal lattices.…”

Section: Resultsmentioning

confidence: 99%

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Structural and Permeation Kinetic Correlations in PdCuAg Membranes

Zhao

Goldbach

Bao

et al. 2014

ACS Appl. Mater. Interfaces

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Addition of Ag is a promising way to enhance the H2 permeability of sulfur-tolerant PdCu membranes for cleanup of coal-derived hydrogen. We investigated a series of PdCuAg membranes with at least 70 atom % Pd to elucidate the interdependence between alloy structure and H2 permeability. Membranes were prepared via sequential electroless plating of Pd, Ag, and Cu onto ceramic microfiltration membranes and subsequent alloying at elevated temperatures. Alloy formation was complicated by a wide miscibility gap in the PdCuAg phase diagram at the practically feasible operation temperatures. X-ray diffraction showed that the lattice constants of the fully alloyed ternary alloys obey Vegard's law closely. In general, H2 permeation rates increased with increasing Ag and decreasing Cu content of the membranes in the investigated temperature range. Detailed examination of the permeation kinetics revealed compensation between activation energy and pre-exponential factor of the corresponding H2 permeation laws. The origin of this effect is discussed. Further analysis showed that the activation energy for H2 permeation decreases overall with increasing lattice constant of the ternary alloy. The combination of these correlations results in a structure-function relationship that will facilitate rational design of PdCuAg membranes.

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Section: Resultssupporting

confidence: 74%

Section: Resultsmentioning

confidence: 99%

Structural and Permeation Kinetic Correlations in PdCuAg Membranes

Zhao

Goldbach

Bao

et al. 2014

ACS Appl. Mater. Interfaces

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“…Some valuable was necessary. Some valuable research results were obtained in the resistance of PdCu, PdCuAg and PdAu to hydrogen sulfide poisoning capacity in recent years [20,[23][24][25][26][27]. For example, Peters [20] and Zhao [28] et al found that the activity of a PdAgCu membrane could be restored after the source of sulfide pollution was cut off for 2.5 h by accurately balancing Cu/Ag contents.…”

Section: Introductionmentioning

confidence: 99%

Influence of Hydrogen Sulfide and Redox Reactions on the Surface Properties and Hydrogen Permeability of Pd Membranes

et al. 2018

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Although hydrogen sulfide (H 2 S) was always a negative factor leading to the reduction of hydrogen permeability of palladium (Pd) membranes, its proper application could result in a positive effect. In this study, pure Pd membranes were firstly reacted with H 2 S at 23-450 • C, and then treated by redox reactions. Afterwards, the hydrogen permeability was tested under different reaction conditions using a hydrogen penetrant testing device. Moreover, both products and morphology changes occurred on the Pd membrane surface were analyzed using XRD, XPS and SEM. The results showed that H 2 S was dissociated to produce sulfides at 23 • C. With a rise of temperature, a regular change took place in the reaction products, morphology of the Pd membrane surface and hydrogen permeability. Adsorbed impurities such as sulfides and free carbon on the Pd membrane surface were removed by the redox treatment. The hydrogen permeability was improved by about 80% for the Pd membrane material subjected to the treatment method stated the above against the untreated one.

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