Mathematics of the Electrochemical Extraction of Hydrogen from Iron

The transient current of hydrogen removal from iron following steady‐state permeation is analyzed theoretically for two limiting conditions at the input side. For the fastest possible removal , the amount extracted at the potentiostated side is one third of the total present at steady‐state permeation described by . Comparison of the integrated total flux and the amount given by the integral of indicates possible concentration dependence of hydrogen diffusivity in iron.