Analysis of hydrogen diffusion coefficient during hydrogen permeation through pure niobium

Zhang, G.X.; Yukawa, Hiroshi; Watanabe, Nobuatsu; Saito, Yahachi; Fukaya, Hidenori; Morinaga, Masahiko; Nambu, T.; Matsumoto, Yoshihisa

doi:10.1016/j.ijhydene.2008.05.062

Cited by 40 publications

(25 citation statements)

References 20 publications

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“…(2) when hydrogen pressures are below 0.1 MPa or above 0.4 MPa. On the other hand, new interpretation on hydrogen permeability which is applicable over a wide pressure range has recently been proposed by Hara et al [10] and Zhang et al [11]. Fig.…”

Section: Resultsmentioning

confidence: 96%

Hydrogen permeability and microstructure of rapidly quenched Nb–TiNi alloys

Ishikawa

Seki

Kita

et al. 2011

Journal of Alloys and Compounds

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Section: Resultsmentioning

confidence: 96%

Hydrogen permeability and microstructure of rapidly quenched Nb–TiNi alloys

Ishikawa

Seki

Kita

et al. 2011

Journal of Alloys and Compounds

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“…13 Taking into account the electronic and elastic strain effects in the nonideal form of Sieverts' law could explain the deviations from the ideal hydrogen solubility in niobium; however, it is clear that the behavior of hydrogen is different in niobium compared with that in palladium.…”

Section: Introductionmentioning

confidence: 99%

A Density Functional Theory Study of the Charge State of Hydrogen in Metal Hydrides

Aboud

Wilcox

2010

J. Phys. Chem. C

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Density functional theory and Bader charge analyses were used to investigate the charge state of hydrogen in vanadium, niobium, tantalum, palladium, and niobium-palladium alloys. Over a range of concentrations and hydrogen-site configurations, it is found that hydrogen consistently acquires a net charge of between approximately -0.51e and -0.64e in the pure group 5 metals compared with a significantly smaller value of 0.3e in palladium. Although there is indirect evidence that the electronic charge plays a role in the solubility and diffusivity of hydrogen in the group 5 metals, this is the first work to quantify the value of the charge. Hydrogen tends to migrate to regions of the metal lattice that minimize its overall charge density, which generally corresponds to the T-site in the bcc metals. It is found that the charge of hydrogen at the O-site of vanadium can be slightly lower due to lattice deformation and may explain the occupation of both T-and O-sites in vanadium hydrides.

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“…1. 3.4 Niobium membrane Zhang et al studied a pure niobium membrane to find that the permeation flux did not obey Sieverts' law [7]. Therefore, they presented only permeation flux for a few operating conditions not permeability.…”

Section: Power Law: Palladium Membrane Reported By Hurlbert and Konecnymentioning

confidence: 99%

“…In other words, the effort of decreasing thickness to improve permeation flux is vanished in permeability. Additionally, deviation from the square-root law has been widely reported [3][4][5][6][7]. Although a power law has often been adopted to describe the deviation since 1901 [3][4][5][6], power-law's permeability values determined with different powers are incomparable one another.…”

Section: Introductionmentioning

confidence: 99%

“…Second, the pressure-dependent permeance is applied to various membranes to demonstrate precise description and comparison among them: pure palladium membranes 50 μm and 200 μm thick measured in our group [10,11], a pure palladium membrane described in the power law by Hurlbert and Konecny [6], a pure niobium membrane reported by Zhang et al [7], and a silica membrane without pressure dependence in permeance reported by Tsuru et al [8]. Because original experimental data are from the literature, the experiment is explained as short as possible.…”

Section: Introductionmentioning

confidence: 99%

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Hydrogen Permeation Performance Comparison among Palladium and Other Membranes with Different Permeation Laws

Hara

Caravella

Ishitsuka

et al. 2011

Trans. Mat. Res. Soc. Japan

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Palladium membranes are useful to produce pure hydrogen by allowing only hydrogen to pass through. However, palladium, a platinum group metal, is limited in resources and expensive. Therefore, alternative membranes are intensively being developed including other metal membranes, porous ceramic membranes, etc. Comparison among them is essential in the development but difficult because these membranes obey different permeation laws. To overcome this difficulty, pressure-dependent permeance is applied to membranes of different thicknesses and different materials: pure palladium membranes 50 μm and 200 μm thick, a pure niobium membrane, and a silica membrane without pressure dependence in permeance. The result demonstrates that pressure-dependent permeance can describe hydrogen permeation flux more precisely than the conventional square-root law and that it enables comparison among membranes with different thicknesses made of different materials. Suitable operating pressure conditions for each membrane are proposed according to the comparison.

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Analysis of hydrogen diffusion coefficient during hydrogen permeation through pure niobium

Cited by 40 publications

References 20 publications

Hydrogen permeability and microstructure of rapidly quenched Nb–TiNi alloys

Hydrogen permeability and microstructure of rapidly quenched Nb–TiNi alloys

A Density Functional Theory Study of the Charge State of Hydrogen in Metal Hydrides

Hydrogen Permeation Performance Comparison among Palladium and Other Membranes with Different Permeation Laws

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