Mechano-elektrochemische Effekte, IV Potentialverschiebungen an Kupfer in nichtwäßrigen Lösungen während und nach der plastischen Deformation

Abstract

Shifts of “current free” electrochemical potentials have been measured during and after mechanical deformation of copper electrodes in 5 · 10⁻⁴ molar electrolyte solutions of acetonitrile, acetone, N,N-dimethylformamide, ethylene sulfite, dimethylsulfoxide and propylene carbonate. The potential changes and their relaxations were investigated depending on the pretreatment of the electrodes and the electrolytes. The plastic deformation of the electrodes produced potential shifts in the range of millivolts. The potential shifts are interpreted in terms of the slipping of (111) planes from the bulk electrode to the interface. In all solvents the potentials were found to be shifted towards negative values, except for acetonitrile. The presence of non-stoichiometric superstructures at the electrode surfaces and their changes in the course of the experiments allow only rather approximative descriptions in terms of simple electrode reactions.