Modeling of hydrogen trapping in the deformed Pd and Pd77Ag23 alloy

Cao, Yang; Li, H.L.; Szpunar, Jerzy A.; Shmayda, W.T.

doi:10.1016/j.msea.2004.01.035

Cited by 12 publications

(9 citation statements)

References 22 publications

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“…Similar effects of lattice defects on F in the Pd-Ag alloys are reported by Cao et al [12]. The reduction of F resulting from hydrogen trapping is dissolved by annealing the sample above the temperature where the lattice defects annihilate.…”

Section: Discussionsupporting

confidence: 73%

Microstructure and hydrogen permeation of cold rolled and annealed Nb40Ti30Ni30 alloy

2009

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Section: Discussionsupporting

confidence: 73%

Microstructure and hydrogen permeation of cold rolled and annealed Nb40Ti30Ni30 alloy

2009

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“…Consequently, part of the hydrogen absorbed by the Pd films should be located in saturable trapping sites, which are readily filled over the whole p H2 -range considered in this study. Hydrogen trapping sites in metals are indeed commonly divided into unsaturable and saturable sites [59,60], part of the latter being irreversible [61,62], i.e. potential wells being too deep to allow hydrogen atoms to escape without external energy.…”

Section: Hydriding Cycle: Equilibrium Analysismentioning

confidence: 99%

Effect of structural defects on the hydriding kinetics of nanocrystalline Pd thin films

Delmelle

Amin-Ahmadi

Sinnaeve

et al. 2015

International Journal of Hydrogen Energy

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MicrostructureInternal stress a b s t r a c t While the microstructure of a metal is well-known to affect its equilibrium hydrogen uptake and therefore the hydriding thermodynamics, microstructural effects on the hydriding kinetics are much less documented. Moreover, for thin film systems, such microstructural effects are difficult to separate from the internal stress effect, since most defects generate internal stresses. Such a decoupling has been achieved in this paper for nanocrystalline Pd thin film model systems through the use of a high-resolution, in-situ curvature measurement set-up during Pd deposition, annealing and hydriding. This set-up allowed producing Pd thin films with similar internal stress levels but significantly different microstructures. This was evidenced from detailed defect statistics obtained by transmission electron microscopy, which showed that the densities of grain boundaries, dislocations and twin boundaries have all been lowered by annealing. The same set-up was then used to study the hydriding equilibrium and kinetic behaviour of the resulting films at room temperature. A full quantitative analysis of their hydriding cycles showed that the rate constants of both the adsorption-and absorption-limited kinetic regimes were strongly affected by microstructure. Defect engineering was thereby shown to increase the rate constants for hydrogen adsorption and absorption in Pd by a factor 40 and 30, respectively.

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“…The degree of saturation of such traps is one of the factors affecting the diffusivity of hydrogen in membranes [12]. Dislocation cores may provide trapping sites that are totally occupied at higher hydrogen concentrations and thereby reduce the number of sites available for hydrogen diffusion [11][12][13][14][15]. The transport process is impeded, as the residence time of hydrogen at the trap sites is more than at the normal lattice sites.…”

Section: Introductionmentioning

confidence: 99%