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. 2016 Nov 21;6(4):48.
doi: 10.3390/membranes6040048.

Hydrogen Induced Abrupt Structural Expansion at High Temperatures of a Ni32Nb28Zr30Cu10 Membrane for H₂ Purification

Oriele Palumbo  1 , Francesco Trequattrini  2   3 , Madhura Hulyalkar  4 , Suchismita Sarker  5 , Narendra Pal  6 , Dhanesh Chandra  7 , Ted Flanagan  8 , Michael Dolan  9 , Annalisa Paolone  10
Affiliations

Hydrogen Induced Abrupt Structural Expansion at High Temperatures of a Ni32Nb28Zr30Cu10 Membrane for H₂ Purification

Oriele Palumbo et al. Membranes (Basel). .

Abstract

Ni-Nb-Zr amorphous membranes, prepared by melt-spinning, show great potential for replacing crystalline Pd-based materials in the field of hydrogen purification to an ultrapure grade (>99.999%). In this study, we investigate the temperature evolution of the structure of an amorphous ribbon with the composition Ni32Nb28Zr30Cu10 (expressed in atom %) by means of XRD and DTA measurements. An abrupt structural expansion is induced between 240 and 300 °C by hydrogenation. This structural modification deeply modifies the hydrogen sorption properties of the membrane, which indeed shows a strong reduction of the hydrogen capacity above 270 °C.

Keywords: DTA; XRD; amorphous membranes; hydrogen sorption; hydrogenation enthalpy; lattice expansion.

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Conflict of interest statement

The authors declare no conflict of interest.

Figures

Figure 1
Figure 1
DTA signal measured at different heating rates. The inset reports the Kissinger plot for the three thermally activated peaks shown by the DTA curves.
Figure 2
Figure 2
Pressure-composition isotherms measured at various temperature between 158 and 400 °C.
Figure 3
Figure 3
Van’t Hoff plot for the Ni32Nb28Zr30Cu10 membrane calculated at different H/M ratios and best fit lines in the low- and high-temperature range.
Figure 4
Figure 4
XRD spectrum of the pristine Ni32Nb28Zr30Cu10 membrane measured at room temperature in a He atmosphere.
Figure 5
Figure 5
X-ray diffractograms measured on increasing temperature with the sample kept in a H2 atmosphere (p ~ 9 bar).
Figure 6
Figure 6
X-ray diffractograms measured with increasing temperature with the sample kept in a He atmosphere (p ~ 1 bar).
Figure 7
Figure 7
Average interatomic distances at the maxima of the X-ray diffraction peak (Figure 5) taken at 9 bar H2 pressure.
See this image and copyright information in PMC

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