Hydrogen Transport through Pd-Ni Alloy Electrodeposited on Pd Substrate

Hydrogen transport through a Pd-Ni alloy electrodeposited on a Pd substrate (Pd-Ni/Pd bilayer symmetric electrode) has been investigated using cyclic voltammetry and a.c. impedance spectroscopy combined with the electrochemical hydrogen permeation method. The permeation build-up current transients and the measured impedance spectra were analyzed using the time-lag method for the bilayer electrode and a complex non-linear least squares data-fitting method based upon the derived Faradaic admittance for the hydrogen absorption into and diffusion through the bilayer electrode under the permeable boundary condition, respectively. The value of the hydrogen diffusivity in the Pd-Ni layer was lower than that in the Pd layer. Furthermore, the values of the charge transfer resistance and equilibrium absorption constant for the Pd-Ni/Pd bilayer electrode were higher than those for the Pd single layer electrode. From the experimental results, the role of the thin Ni(OH)(2) film formed on the Pd-Ni layer surface in the hydrogen transport through the Pd-Ni/Pd bilayer electrode is discussed in terms of its passivating effect and extremely large hydrogen solubility.
Publisher
Springer
Issue Date
1997
Language
ENG
Keywords

AC-IMPEDANCE; ABSORPTION REACTION; BOUNDARY-CONDITIONS; MEMBRANE-ELECTRODE; PASSIVATING FILM; PALLADIUM; PERMEATION; DIFFUSION; BILAYER; IRON

Citation

JOURNAL OF SOLID STATE ELECTROCHEMISTRY, v.1, no.2, pp.120 - 125

ISSN
1432-8488
URI
http://hdl.handle.net/10203/73214
Appears in Collection
NE-Journal Papers(저널논문)
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