An electric analog of an electrochemical cell is assumed to consist of a constant ohmic resistance, representing the bulk electrolyte, and a parallel combination of resistance and differential capacity, representing one interface. The response of the model to a rectangular current-time function is given in terms of circuit components. The interface parameters are not assumed to be constant and the equations yield instantaneous values for each of them. A pulse generator is described, which is capable of closely approximating the required current-time function. Results of measurements made on Pt and dropping Hg are presented.
The apparatus contains a reference surface (gold) and provision for evaporating the experimental surface onto a rotating metal plate. Circuits used to measure the surface potential difference between the two metal surfaces are described. The apparatus has a rapid and continuous response to changes in the surface potential difference (SPD) between an experimental and a reference surface. As a result, the resolution of the initial variation of the SPD on sorption of oxygen on evaporated iron has been materially increased. The apparatus can be modified to allow SPD measurement on single crystals or catalyst surfaces.
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