Nb–HfCo alloys with pronounced high hydrogen permeability: A new family of metallic hydrogen permeation membranes

Pd-based composite membranes are the attractive membrane materials for hydrogen separation due to their high hydrogen permeability and infinite permselectivity. Thin pure Ni and Pd-Ni alloy membranes with high hydrogen permeation were prepared by the electroless plating method. It is difficult to prepare the dense pure Ni membranes with 1-2 μm thickness for hydrogen separation. However, Pd-Ni alloy membranes with several micrometers thickness showed good permeation performance. Hydrogen permeance of the Pd95Ni5 alloy membrane with fcc phase up to 3.1×10-6 mol/m2 s Pa and the ideal permselectivity over 600 were obtained at 773 K.

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A Review for Consistent Analysis of Hydrogen Permeability through Dense Metallic Membranes

Membranes ◽

10.3390/membranes10060120 ◽

2020 ◽

Vol 10 (6) ◽

pp. 120

Author(s):

Asuka Suzuki ◽

Hiroshi Yukawa

Keyword(s):

Diffusion Coefficient ◽

Hydrogen Embrittlement ◽

Alloy Composition ◽

Hydrogen Permeation ◽

Hydrogen Permeability ◽

Anomalous Temperature Dependence ◽

Anomalous Temperature ◽

High Hydrogen ◽

Hydrogen Flux ◽

Solubility Constant

The hydrogen permeation coefficient (ϕ) is generally used as a measure to show hydrogen permeation ability through dense metallic membranes, which is the product of the Fick’s diffusion coefficient (D) and the Sieverts’ solubility constant (K). However, the hydrogen permeability of metal membranes cannot be analyzed consistently with this conventional description. In this paper, various methods for consistent analysis of hydrogen permeability are reviewed. The derivations of the descriptions are explained in detail and four applications of the consistent descriptions of hydrogen permeability are introduced: (1) prediction of hydrogen flux under given conditions, (2) comparability of hydrogen permeability, (3) understanding of the anomalous temperature dependence of hydrogen permeability of Pd-Ag alloy membrane, and (4) design of alloy composition of non-Pd-based alloy membranes to satisfy both high hydrogen permeability together with strong resistance to hydrogen embrittlement.

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Hydrogen permeation through a slab sample in the case of high hydrogen concentration

Thin Solid Films ◽

10.1016/j.tsf.2005.09.002 ◽

2006 ◽

Vol 496 (2) ◽

pp. 735-739 ◽

Cited By ~ 3

Author(s):

Maurizio Dapor ◽

Antonio Miotello ◽

Arturo Sabbioni

Keyword(s):

Hydrogen Concentration ◽

Hydrogen Permeation ◽

High Hydrogen

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High Hydrogen Permeability in the Nb-Rich Nb—Ti—Ni Alloy.

ChemInform ◽

10.1002/chin.200613012 ◽

2006 ◽

Vol 37 (13) ◽

Author(s):

W. Luo ◽

K. Ishikawa ◽

K. Aoki

Keyword(s):

Hydrogen Permeability ◽

High Hydrogen ◽

Ni Alloy

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Microstructure and Hydrogen Permeability of Duplex Phase M-ZrNi (M=V, Nb, Ta) Alloys

MRS Proceedings ◽

10.1557/proc-980-0980-ii05-53 ◽

2006 ◽

Vol 980 ◽

Author(s):

Kazuhiro Ishikawa ◽

Naoshi Kasagami ◽

Tomoyuki Takano ◽

Kiyoshi Aoki

Keyword(s):

Crystal Structure ◽

Solid Solution ◽

High Performance ◽

Gas Flow ◽

Hydrogen Permeation ◽

Hydrogen Permeability ◽

The Other ◽

Cast State ◽

X Ray ◽

Scanning Electron

AbstractIn order to develop non-Pd based high performance hydrogen permeation alloys, microstructure, crystal structure and hydrogen permeability of duplex phase M-ZrNi (M=V and Ta) alloys were investigated using a scanning electron microscope, an X-ray diffractometer and a gas flow meter. These results were compared with those of Nb-ZrNi ones which have been previously published. The hydrogen permeation was impossible in the V-ZrNi alloys, because they were brittle in the as-cast state. On the other hand, duplex phase alloys consisting of the bcc-(Ta, Zr) solid solution and the orthorhombic ZrNi (Cmcm) intermetallic compound were formed and hydrogen permeable in the Ta-ZrNi system. The Ta40Zr30Ni30 alloy shows the highest value of hydrogen permeability of 4.1×10-8 [molH2m-1s-1Pa-0.5] at 673 K, which is three times higher than that of pure Pd.

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Hydrogen Permeation Properties of Nb-Based Two-Phase Compounds

Materials Science Forum ◽

10.4028/www.scientific.net/msf.561-565.467 ◽

2007 ◽

Vol 561-565 ◽

pp. 467-470

Author(s):

Yuji Yamaguchi ◽

Kyosuke Kishida ◽

Katsushi Tanaka ◽

Haruyuki Inui ◽

Sho Tokui ◽

...

Keyword(s):

Hydrogen Embrittlement ◽

Hydrogen Permeation ◽

Membrane Surface ◽

Hydrogen Permeability ◽

Eutectic Structure ◽

Growth Direction ◽

Directionally Solidified ◽

Two Phase ◽

Cast Sample ◽

Lamellar Type

Nb-NiTi and Nb-CoTi eutectic alloys were directionally solidified in an optical floating zone furnace. Rod-type eutectic structures with Nb rods aligned parallel to the growth direction are obtained for Nb-41Ni-40Ti grown at relatively slow growth rates below 1.0mm/h, while lamellar-type eutectic structures are obtained for Nb-35Co-34Ti grown at the same condition. The hydrogen permeability for the Nb-41Ni-40Ti DS alloy with Nb rods perpendicular to the membrane surface is 2.60×10-8mol H2 m-1 Pa-1/2 at 673K, which is about 2.5 times higher than that of as-cast sample. No hydrogen embrittlement is observed between 573 and 673K, indicating that the Nb-NiTi rod-type eutectic structure effectively suppresses the hydrogen embrittlement of Nb during hydrogen permeation.

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High hydrogen permeability in the Nb–Zr–Ni eutectic alloy containing the primary body-centered-cubic (Nb, Zr) phase

Applied Physics Letters ◽

10.1063/1.2006985 ◽

2005 ◽

Vol 87 (8) ◽

pp. 081906 ◽

Cited By ~ 30

Author(s):

K. Ishikawa ◽

T. Takano ◽

T. Matsuda ◽

K. Aoki

Keyword(s):

Eutectic Alloy ◽

Hydrogen Permeability ◽

Body Centered Cubic ◽

High Hydrogen ◽

Primary Body

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Effect of Moisture on Chemical Stability and Hydrogen Permeability of Ni-BaCe0.9Y0.1O3-δ Cermet

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.368-372.256 ◽

2008 ◽

Vol 368-372 ◽

pp. 256-258 ◽

Cited By ~ 3

Author(s):

Shu Min Fang ◽

Jing Yang ◽

Chu Shen Chen ◽

Wei Liu

Keyword(s):

Partial Pressure ◽

Chemical Stability ◽

Hydrogen Permeation ◽

Ph Value ◽

Hydrogen Permeability ◽

Volume Ratio ◽

Partial Pressures ◽

Doped Ceo2 ◽

Effect Of Moisture ◽

Value Measurement

Ni-BaCe0.9Y0.1O3-δ mixed protonic-electronic conductor can be used to separate hydrogen from syngas. Considering that water exists in syngas, it is necessary to evaluate the effect of moisture on chemical stability and hydrogen permeability of the cermet. In this paper, hydrogen permeation rates of Ni- BaCe0.9Y0.1O3-δ (40:60 in volume ratio) in different water partial pressures were measured at intermediate temperatures (600-750°C). It is found that hydrogen permeation rate of the cermet is highest at an appropriate water partial pressure. Samples after experiment were analyzed by XRD, ICP and pH value measurement, in which Ba(OH)2 and doped CeO2 were found. The reaction of water with samples resulting in insulating Ba(OH)2 and doped CeO2 is contributed to the decrease of hydrogen permeation in excessive water partial pressure.

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