The input impedance Z1(ω) = ΔV1/ΔI1 and the permeation transfer function H(ω) = ΔI2/ΔI1 were simultaneously measured during H permeation through an Fe membrane in a conventional electrochemical Devanathan double cell. Experimental parameters, such as the thickness of the membrane or the polarization potential applied at the input side, were investigated, and their influence was considered in terms of a new model. In most cases, an alkaline electrolyte was used in the input cell. The effect of a thin Pd layer deposited on the output side was also investigated. In acidic medium, it was shown that the spontaneous corrosion at rest potential was sufficient to feed H permeation. Thiourea, which was known to be a promoter of H penetration into Fe materials, was added to the input solution. The effect of this additive on the evolution/permeation process was investigated by impedance and permeation transfer function analysis.

Transfer Function Analysis of Hydrogen Permeation through a Metallic Membrane in a Devanathan Cell – II - Experimental Investigation on Iron Membrane. C.Gabrielli, G.Maurin, L.Mirkova, H.Perrot: Journal of Electroanalytical Chemistry, 2006, 590[1], 15-25