Stability of a hydrogen molecule in a vacancy of palladium hydrides

He, Jinbo; Dechiaro, L. F.; Knies, D. L.; Hubler, G. K.; Grabowski, K. S.; Moser, Alex; Dominguez, Dawn D.; Kidwell, David A.; Hagelstein, Peter L.

doi:10.1016/j.ijhydene.2012.05.035

Cited by 8 publications

(1 citation statement)

References 17 publications

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“…At room temperature, the palladium hydride phase diagram consists of a phase with low hydrogen content, b phase with high hydrogen content, and an intermediate miscibility gap consisting of both a and b phases. [26][27][28] Our previous studies also revealed that b-PdH x existed in freshly obtained Pd tetrapod nanocrystals and then were gradually transformed into pure Pd nanocrystals in air. 23 It is therefore reasonable to consider palladium hydride as the active agent to reduce Ag + .…”

Section: Resultsmentioning

confidence: 88%

A hydride-induced-reduction strategy for fabricating palladium-based core–shell bimetallic nanocrystals

Wang

Chen

et al. 2014

Nanoscale

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One key challenge in making high-quality bimetallic nanocrystals is to prevent self-nucleation of individual metal components. We report in this work an effective seeded growth strategy that uses activated hydrogen atoms as the reducing agent to prepare core-shell bimetallic nanocrystals. In the developed method, Pd nanocrystals serve as the seed and catalyst as well to activate H2 for the reductive deposition of Ag. The unique feature of the developed method is that the activated hydrogen atoms are confined on the surface of the Pd seeds. Consequently, the self-nucleation of Ag is effectively inhibited so that the deposition of Ag occurs only on Pd. The mechanism studies reveal that reductive growth of Ag on Pd seeds proceeds until the Pd surface is fully covered by Ag. The Ag/Pd ratio in the prepared Pd@Ag nanocrystals is readily fine-tuned by the amount of AgNO3 or H2. The method is effective for depositing Ag on Pd nanocrystal seeds with different morphologies such as nanosheets, nanocubes, tetrahedra and nanowires. More importantly, the deposition of Ag on Pd nanowires allows preparation of flexible transparent electrode material with sheet electronic conductivity of 271 S sq(-1) at a transmittance of over 90%.

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Section: Resultsmentioning

confidence: 88%

A hydride-induced-reduction strategy for fabricating palladium-based core–shell bimetallic nanocrystals

Wang

Chen

et al. 2014

Nanoscale

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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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Aerogel sheet of carbon nanotubes decorated with palladium nanoparticles for hydrogen gas sensing

Kim

Jeon

Ovalle‐Robles³

et al. 2018

International Journal of Hydrogen Energy

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Stability of a hydrogen molecule in a vacancy of palladium hydrides

Cited by 8 publications

References 17 publications

A hydride-induced-reduction strategy for fabricating palladium-based core–shell bimetallic nanocrystals

A hydride-induced-reduction strategy for fabricating palladium-based core–shell bimetallic nanocrystals

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

Aerogel sheet of carbon nanotubes decorated with palladium nanoparticles for hydrogen gas sensing

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