The effect of hydrogenation/dehydrogenation cycles on palladium physical properties

Tripodi, P.; Armanet, Nicolas; Asarisi, Vincenzo; Avveduto, Alessandro; Marmigi, Alessandro; Vinko, Jenny Darja; Bibérian, Jean-Paul

doi:10.1016/j.physleta.2009.06.057

Cited by 17 publications

(9 citation statements)

References 13 publications

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“…The results are shown in Fig. 6, and indicate that the TCR of our nanocrystalline Pd thin films is smaller than the bulk value (3.77$10 À3 K À1 [49]), as expected [49,51,52]. One can also clearly see that the TCR increases with increasing film thickness, as previously reported [49,52].…”

Section: In-situ Study Of Microstructural Changes During Annealingsupporting

confidence: 84%

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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Section: In-situ Study Of Microstructural Changes During Annealingsupporting

confidence: 84%

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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“…Recently, we found through numerical analysis that a large degree of energy focusing, with enhancement factors over several hundred, is available for planar surfaces of hydrogen-absorbing transition metals, Pd, Ti, and Ni, in the microwave region, even surpassing the enhancement for noble metals [26]. We therein discussed the potential applications of the plasmonic field enhancement effect on hydrogen-absorbing transition metals, such as hydrogen storage [27,28,29,30,31], sensing [32,33,34], and nuclear fusion [35,36,37,38]. In contrast to the studied plasmonic field enhancement effect on planar metal surfaces, it is known that surfaces with sharp curvatures allow the electromagnetic field to concentrate further, called the “lightning-rod effect” [39,40,41,42,43].…”

Section: Introductionmentioning

confidence: 99%

Lightning-Rod Effect of Plasmonic Field Enhancement on Hydrogen-Absorbing Transition Metals

Fukuoka

Tanabe

2019

Nanomaterials

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The plasmonic enhancement of electromagnetic field energy density at the sharp tips of nanoparticles or nanoscale surface roughnesses of hydrogen-absorbing transition metals, Pd, Ti, and Ni, is quantitatively investigated. A large degree of energy focusing is observed for these transition metals in the microwave region, even surpassing the enhancement for noble metals according to the conditions. Pd, for instance, exhibits peak field enhancement factors of 6000 and 2 × 108 in air for morphological aspect ratios of 10 and 100, respectively. Metal surfaces possibly contain such degrees of nano- or micro-scale native random roughnesses, and, therefore, the field enhancement effect may have been unknowingly produced in existing electrical and optical systems. In addition, for future devices under development, particularly in hydrogen-related applications, it is desirable to design and optimize the systems, including the choice of materials, structures, and operating conditions, by accounting for the plasmonic local energy enhancement effect around the metal surfaces.

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“…The Pd wire is maintained in a vertical position by a constant mechanical tension applied. The set-up and the electrolytic cell used in this work have been described elsewhere [1,2] …”

Section: Experimental Considerationsmentioning

confidence: 99%

“…In our previous paper [1], a series of hydrogenation/dehydrogenation cycles on palladium wire samples, stressed by a constant tension have been performed. A large increase of palladium electrical resistivity due to the combined effect of the defects production linked to hydrogen diffusion inside the host lattice and the stress applied to the sample has been reported.…”

Section: Introductionmentioning

confidence: 99%

Strain and resistivity of PdHx at hydrogen composition x>0.8

Tripodi

Avveduto²,

Vinko³

2010

Journal of Alloys and Compounds

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The effect of hydrogenation/dehydrogenation cycles on palladium physical properties

Cited by 17 publications

References 13 publications

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

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

Lightning-Rod Effect of Plasmonic Field Enhancement on Hydrogen-Absorbing Transition Metals

Strain and resistivity of PdHx at hydrogen composition x>0.8

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