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Anisotropic Hydrogen Permeation in Nano/Poly Crystalline-Nickel Membranes

Published online by Cambridge University Press:  11 February 2011

Y. Cao ,
H. Li ,
J. A. Szpunar  and
W. T. Shmayda
Y. Cao
Affiliation:
Department of Metals and Materials Engineering, McGill University, Montreal, PQ, H3A 2B2, Canada
H. Li
Affiliation:
Department of Metals and Materials Engineering, McGill University, Montreal, PQ, H3A 2B2, Canada
J. A. Szpunar
Affiliation:
Department of Metals and Materials Engineering, McGill University, Montreal, PQ, H3A 2B2, Canada
W. T. Shmayda
Affiliation:
Lab for Laser Energetics, University of Rochester, Rochester, NY, 14623–1299, USA
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Abstract

Bilayer nickel membranes have been prepared using electrodeposition to grow polycrystalline nickel on a nanocrystalline nickel substrate. When hydrogen is charged from the nano-Ni side of the nano-Ni and poly-Ni composite membrane, the permeation current increases rapidly, then the membrane releases hydrogen faster during decay. When hydrogen is charged from the poly-Ni side of the same composite membrane, the permeation current rises gradually and takes a longer time to reach steady state. Also the permeability of nano-poly-Ni membrane is eight times higher than that of poly-nano-Ni membrane. The diffusivity for the nano-Ni side charging in a nano-poly-Ni membrane is two times higher than that of poly-Ni side charging of the same membrane. The diffusivity and permeability of nano-poly-Ni membranes are smaller than those for nano-Ni membranes, but larger than those for poly-Ni membranes. Using this anisotropic behavior, one can manipulate hydrogen permeation through composite membranes. A hydrogen permeation model for bilayer membranes is proposed to simulate diffusion in a nano-Ni and poly-Ni bilayer membrane in two-directions of charging. The experimental data is in good qualitative agreement with the model.

Keywords

Hydrogen PermeationNanocrystallineNickelBilayer Membranes
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 752: Symposium AA – Membranes–Preparation, Properties and Applications , 2002 , AA12.4
Copyright
Copyright © Materials Research Society 2003

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References

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