Mechano-elektrochemische Effekte, V. Potentialverschiebungen bei plastischer Deformation von Silber

Abstract

Shifts of “current free” electrochemical potentials have been measured during and after mechanical deformation of silver electrodes in 5 · 10⁻⁴ molar electrolyte solutions of water, dimethylsulfoxide, propylene carbonate, ethylene sulfite and acetonitrile. The potential changes and their relaxations were investigated depending on the pretreatment of the electrolytes. The plastic deformation of the electrodes produced potential shifts towards positive values in the range of millivolts. The potential shifts were interpreted in terms of the slipping of (111) planes from the bulk electrode to the interface. It is assumed that changes in microcrystalline surface structures may account for the high exchange current densities observed.