THE ELECTRODE BEHAVIOR OF COPPER

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Abstract
Potentials ranging from −0.063 volt to +0.044 volt were observed for freshly prepared copper electrodes in sulphuric acid. The potential was dependent upon concentration of the electrolyte, the gas with which the electrolyte was saturated, the nature of the electrode surface, and the intensity of the stirring. The rate of potential decay was influenced by the nature of the dissolved gas and concentration of the electrolyte. When current was passed for the first time across a freshly prepared electrode face, the potential build-up was nonlinear, but subsequent passage of current gave a linear build-up of potential. The apparent capacitance at a copper cathode increased with the time allowed for the potential to decay after current had been passed. It was also dependent upon the current used to measure it, and appeared to be somewhat affected by the area of the cathode. Reliable estimates of the surface areas of the electrodes appeared to be possible from the times required for the electrodes to reach maximum potentials.

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