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

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Palumbo, Oriele
Trequattrini, Francesco
Hulyalkar, Madhura
Sarker, Suchismita
Pal, Narendra K.
Chandra, Dhanesh
Flanagan, Ted
Dolan, Michael
Paolone, Annalisa

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2016-11-21

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Article

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amorphous membranes , DTA , hydrogenation enthalpy , hydrogen sorption , lattice expansion , XRD

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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.

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Creative Commons Attribution 4.0 United States

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