Novel PdAgCu ternary alloy: Hydrogen permeation and surface properties

Tarditi, Ana María; Braun, Fernando; Cornaglia, Laura María

doi:10.1016/j.apsusc.2011.02.089

Cited by 66 publications

(36 citation statements)

References 27 publications

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“…Thus, there is a significant difference between lattice parameter determined from the (111) and the (200) diffraction peaks that needs further discussion. These deviations between the experimental and the expected lattice parameters for the (200) peaks was already observed for the PdCu alloys [27,29]. The significant difference between (a 200 À a exp ) and (a 111 À a exp ) denotes an anisotropic deformation of the crystalline structure.…”

Section: Resultsmentioning

confidence: 64%

“…The fact that there is a linear relationship between the experimentally measured and the expected lattice parameter is a clear indication that the bulk and the surface concentration are identical. [26,27], the fcc phase is formed directly upon electrodeposition and no further heat treatment is needed. Elsewhere [38], PdeAg films were prepared by electrodeposition.…”

Section: Resultsmentioning

confidence: 99%

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Hydrogen solubility in PdCuAg ternary alloy films prepared by electrodeposition

Tosques¹,

Martin²,

Roué³

et al. 2014

International Journal of Hydrogen Energy

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Section: Resultsmentioning

confidence: 64%

Section: Resultsmentioning

confidence: 99%

Hydrogen solubility in PdCuAg ternary alloy films prepared by electrodeposition

Tosques¹,

Martin²,

Roué³

et al. 2014

International Journal of Hydrogen Energy

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“…Using an apparatus and procedure that have been described previously [40], the permeability of a 14 mm thick Pd 83 Ag 2 Au 15 / 0.1mmPSS disc (modified with ZrO 2 ) ternary alloy membrane was compared to that of a similarly prepared pure Pd membrane. At T ¼ 673 K and DP ¼ 50 kPa, the alloy membrane displayed pure H 2 permeability of 1.3 Â 10 À8 mol m À1 s À1 Pa À0.5 , slightly higher than that of the pure Pd sample, 1.2 Â 10 À8 mol m À1 s À1 Pa À0.5 .…”

Section: 4mentioning

confidence: 99%

PdAgAu alloy with high resistance to corrosion by H2S

Braun

Miller

Gellman

et al. 2012

International Journal of Hydrogen Energy

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Hydrogen separation membrane a b s t r a c tPdAgAu alloy films were prepared on porous stainless steel supports by sequential electroless deposition. Two specific compositions, Pd 83 Ag 2 Au 15 and Pd 74 Ag 14 Au 12 , were studied for their sulfur tolerance. The alloys and a reference Pd foil were exposed to 1000H 2 S/H 2 at 623 K for periods of 3 and 30 h. The microstructure, morphology and bulk composition of both non-exposed and H 2 S-exposed samples were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM) and energy-dispersive X-ray spectroscopy (EDS). XRD and SEM analysis revealed time-dependent growth of a bulk Pd 4 S phase on the Pd foil during H 2 S exposure. In contrast, the PdAgAu ternary alloys displayed the same FCC structure before and after H 2 S exposure. In agreement with the XRD and SEM results, sulfur was not detected in the bulk of either ternary alloy samples by EDS, even after 30 h of H 2 S exposure. X-ray photoelectron spectroscopy (XPS) depth profiles were acquired for both PdAgAu alloys after 3 and 30 h of exposure to characterize sulfur contamination near their surfaces. Very low S 2p and S 2s XPS signals were observed at the top-surfaces of the PdAgAu alloys, and those signals disappeared before the etch depth reached w10 nm, even for samples exposed to H 2 S for 30 h. The depth profile analyses also revealed silver and gold segregation to the surface of the alloys; preferential location of Au on the alloys surface may be related to their resistance to bulk sulfide formation. In preliminary tests, a PdAgAu alloy membrane displayed higher initial H 2 permeability than a similarly prepared pure Pd sample and, consistent with resistance to bulk sulfide formation, lower permeability loss in H 2 S than pure Pd.

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“…In a series of PdCuAu ternaries with Pd between 53% and 87% (at) and Au from 3% to 8%, Coulter observed that substitution of Au for Cu increases the permeability of the parent PdCu alloy [50]. Substitution of Ag for Cu in PdCu also improves permeability: Tarditi reported that a Pd 68 Cu 25 Ag 7 alloy is 3.9 times as permeable as Pd 67 Cu 33 [51]. Peters examined a series of PdCuM ternaries with Pd between 65% and 75% (at) and M from 1% to 14% (i.e., near Pd 70 Cu 30 ) with M ¼ Ag, Au, Ru Mo, Ta, and Y [46].…”

Section: Ternary Pd Alloysmentioning

confidence: 96%