The role of transition resistance in the phenomenon of hydrogen overvoltage

Abstract

In this work, the method of direct measurement of the transition resistance, as well as the thickness of the gas film that gives rise to it, was employed using alternating current superimposed on the polarizing direct current. This work allows the following conclusions to be drawn: 1) the existence of transition resistance at a mercury cathode is beyond doubt; however, transition resistance is not the sole cause of hydrogen overvoltage; 2) the formation of a hydrogen film that gives rise to transition resistance begins at very low cathodic polarization; 3) the maximum resistance of the film corresponds to the beginning of the increase in current on the current density-potential curve; 4) with an increase in direct current density, the magnitude of the transition resistance decreases.

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