The H-Pd (hydrogen-palladium) System

Manchester, F. D.; San-Martin, A.; Pitre, J. M.

doi:10.1007/bf02667685

Cited by 287 publications

(312 citation statements)

References 182 publications

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“…Thus, the addition of silver reduces the cost. The addition of silver into palladium also enhances the durability of the membrane by suppressing the α-α phase transition below 298 C [8][9][10][11][12][13][14][15][16] . Therefore, Pd-Ag alloys are one of the most promising materials for hydrogen permeable metal membranes.…”

Section: Introductionmentioning

confidence: 99%

Anomalous Temperature Dependence of Hydrogen Permeability through Palladium–Silver Binary Alloy Membrane and Its Analysis Based on Hydrogen Chemical Potential

et al. 2016

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The hydrogen permeability of Pd-Ag alloy membranes has been investigated over a wide temperature range between 100 C and 500 C. The hydrogen permeation coef cient, Φ, for Pd-23mol%Ag decreases with decreasing temperature above 300 C, in good agreement with the previous literature. However, Φ starts to increases below 250 C, and a peak is observed at around 180 C. Considering the silver concentration and operating temperature, the α-α phase transition never occurs in this condition. In other words, the α-α phase transition is not the reason for the anomalous peak behavior of Pd-23mol%Ag alloy at low temperature. In addition, it is con rmed that the diffusion-limiting hydrogen permeation reaction takes place from room temperature up to 500 C. To understand the reason for the peak appearance, the hydrogen permeability has been analyzed in view of the new description of hydrogen permeation based on hydrogen chemical potential. As a result, it is found that the temperature dependence of the PCT factor, f PCT , is dominant for the peak appearance, meaning that the corresponding pressure-composition-isotherms (PCT curves) are essential for the understanding of hydrogen permeability of the alloy. Dependences of the pressure condition and silver concentration on the peak behavior have also been investigated. The peak temperature increases with increasing the hydrogen pressure at feed side. In addition, the peak appears at lower temperature and becomes remarkable with decreasing silver concentration of Pd-Ag alloy membrane. In other words, the composition of Pd-Ag alloy membranes must be designed based on the operating temperature or pressure condition. Thus, this study suggests new possibilities of alloy design for Pd-Ag alloy membranes.

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Section: Introductionmentioning

confidence: 99%

Anomalous Temperature Dependence of Hydrogen Permeability through Palladium–Silver Binary Alloy Membrane and Its Analysis Based on Hydrogen Chemical Potential

et al. 2016

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“…2b. The out-of-plane lattice constant determined for the phase is higher than the corresponding lattice parameter for the bulk Pd sample [6] indicated by a dashed line in the figure. This testifies to compressive in-plane stress imposed by lattice mismatch between the films and the substrates.…”

Section: Resultsmentioning

confidence: 84%

“…substrate: the development of (a) peak width and (b) lattice parameter during hydrogen loading. Dashed lines in the right panel shows the lattice parameter for the bulk  and  phase reported in literature [6]. The lines are just to guide the eye.…”

Section: Resultsmentioning

confidence: 99%

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Hydrogen-Induced Buckling of Pd Films Deposited on Various Substrates

Vlček

Lukáč

Vlach

et al. 2015

DDF

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A Pd-H system is a model system suitable for studying interactions of hydrogen with metals. In the present work, we studied hydrogen-induced buckling of thin Pd films deposited on various substrates with different bonding strengths (sapphire, glimmer) and also the effect of deposition temperature. Lattice expansion and phase transitions were investigated by X-ray diffraction of synchrotron radiation. The influence of the substrate and microstructure of the film on the buckling process and phase transformation to palladium hydride are discussed.

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“…In case of Pd, hydrogen occupies mostly octahedral sites in the metal lattice [37]. Generally, hydrogen uptake leads to expansion of the crystal lattice, causing mechanical stresses, which in turn cause changes in work function of the metal [38,39].…”

Section: Measurement Basics and Principlesmentioning

confidence: 99%

Challenges in hydrogen quantification using Kelvin probe technique at different levels of relative humidity

Burgstaller

Schimo

Hassel

2017

J Solid State Electrochem

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Kelvin probe-based contact potential measurements were conducted with in situ electrochemical hydrogen loading of a Pd membrane with a thickness of 100 μm. The theoretical basis of diffusion coefficient calculation based on measured response time of potential drop, arising from hydrogen arriving at the detection side of the Pd membrane, was discussed. In situ hydrogen loading was also utilized for insertion of different amounts of hydrogen into the Pd sample while monitoring the resulting contact potential difference changes. Measurement of contact potential difference at different final values of hydrogen concentration in the Pd membrane was performed at various atmospheric conditions, focusing in this work on increasing relative humidity (4 to 85% rH). Moreover, the effect of humidity changes on hydrogen effusion kinetics at room temperature and low oxygen content (<1%) was studied.

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The H-Pd (hydrogen-palladium) System

Cited by 287 publications

References 182 publications

Anomalous Temperature Dependence of Hydrogen Permeability through Palladium–Silver Binary Alloy Membrane and Its Analysis Based on Hydrogen Chemical Potential

Anomalous Temperature Dependence of Hydrogen Permeability through Palladium–Silver Binary Alloy Membrane and Its Analysis Based on Hydrogen Chemical Potential

Hydrogen-Induced Buckling of Pd Films Deposited on Various Substrates

Challenges in hydrogen quantification using Kelvin probe technique at different levels of relative humidity

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