Consistent description of hydrogen permeability through metal membrane based on hydrogen chemical potential

Suzuki, Asuka; Yukawa, Hiroshi; Nambu, T.; Matsumoto, Yoshihisa; Murata, Yoshinori

doi:10.1016/j.ijhydene.2014.03.123

Cited by 26 publications

(35 citation statements)

References 21 publications

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“…The validity of eq. (5) has been con rmed by a series of hydrogen permeation tests with pure niobium, Nb-based alloy and Pd-based alloy membranes 21,23,24) . Figure 6 shows the correlation between the normalized hydrogen ux, J L, and the PCT factor, f PCT , for Pd-23mol%Ag at 100 C 400 C. The f PCT value at each temperature and pressure condition is estimated from the PCT curves for Pd23mol%Ag shown in Fig.…”

Section: Analysis Of Hydrogen Permeability With the Diffusion Equatiomentioning

confidence: 94%

“…Strictly speaking, the driving force for hydrogen diffusion is the gradient of hydrogen chemical potential, dμ/dx. Recently, we have proposed a new description of hydrogen permeation through metal membrane based on hydrogen chemical potential 21) . The diffusion equation based on hydrogen chemical potential is expressed as follows 22) ,…”

Section: Analysis Of Hydrogen Permeability With the Diffusion Equatiomentioning

confidence: 99%

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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: Analysis Of Hydrogen Permeability With the Diffusion Equatiomentioning

confidence: 94%

Section: Analysis Of Hydrogen Permeability With the Diffusion Equatiomentioning

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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“…From these two points of f PCT and DBTC, Suzuki et al have proposed the most practical way to design alloy composition with high hydrogen flux while preventing brittle fracture during the operation. 20,27,28 A schematic illustration showing the concept for alloy design is shown in Fig. 11.…”

Section: Alloy Design Based On New Description Of Hydrogen Permeamentioning

confidence: 99%

“…Recently, present authors have proposed a new consistent description of the hydrogen permeation through metal membrane based on hydrogen chemical potential. 20 In this paper, the new description of the hydrogen permeation is explained in detail and some examples of the application for alloy design will be reviewed.…”

Section: Introductionmentioning

confidence: 99%

Consistent description of hydrogen permeation through metal membrane based on hydrogen chemical potential and its application to alloy design

2016

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A consistent description of the hydrogen permeation through metal membrane based on hydrogen chemical potential proposed has been explained in detail. The hydrogen flux is proportional to the PCT factor, f PCT , consistently, which reflects the shape of the pressure-composition-isotherm (PCT curve) of the material. In addition, in view of the PCT factor, f PCT , and the ductile-to-brittle transition hydrogen concentration, DBTC, a concept for alloy design with high hydrogen permeability and strong resistance to hydrogen embrittlement has been proposed. In this concept, it is important to design alloy composition with appropriate PCT curve under the given pressure and temperature condition. As an example, V-9 mol% Al alloy has been designed, which exhibits high hydrogen flux without brittle fracture under given condition. Thus, the new consistent description is useful not only for the understanding of the hydrogen permeation property but also for the alloy design.

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“…20) Following this description, the hydriding properties (i.e., pressure-composition-isotherms) are very important to understand the hydrogen permeability of metal membrane.…”

Section: Introductionmentioning

confidence: 99%

Alloying Effects on Hydrogen Solubility and Hydrogen Permeability for V-Based Alloy Membranes

et al. 2015

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The alloying effects of chromium, molybdenum, tungsten, iron and cobalt on the hydrogen solubility of vanadium have been investigated systematically. The addition of iron or cobalt into vanadium decreases the hydrogen solubility more significantly than chromium, molybdenum and tungsten. Thus, the addition of iron or cobalt into vanadium improves the resistance to hydrogen embrittlement of the vanadium alloy itself effectively. It is also found that, in view of the new description of hydrogen permeation based on hydrogen chemical potential, these alloying elements enhance the hydrogen flux through the vanadium alloy. This is because the PCT factor, f PCT , increases by the addition of iron or cobalt. Thus, alloying these elements into vanadium improves not only the resistance to hydrogen embrittlement, but also the hydrogen permeation ability.

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Consistent description of hydrogen permeability through metal membrane based on hydrogen chemical potential

Cited by 26 publications

References 21 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

Consistent description of hydrogen permeation through metal membrane based on hydrogen chemical potential and its application to alloy design

Alloying Effects on Hydrogen Solubility and Hydrogen Permeability for V-Based Alloy Membranes

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