Dresden 2011 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 20: Solid / liquid interfaces II
O 20.3: Vortrag
Montag, 14. März 2011, 17:45–18:00, WIL B321
Dynamic Electromechanical Response during Cyclic Voltammetry: Interfacial Processes — •Maxim Smetanin1, Qibo Deng1, and Jörg Weissmüller1,2 — 1Institute of Materials Physics, Hamburg University of Technology, Hamburg, Germany — 2Institute of Materials Mechanics, Helmholtz Zentrum Geesthacht, Geesthacht, Germany
An interest in the impact of elastic strain on the electrochemical behavior of metal electrodes was rapidly increasing over the past decade. Research scope in that context includes the impact of strain on the electrode potential at constant charge density as well as the repercussions of mechanical deformation for electrosorption phenomena and electrocatalytic reaction rates. Here, we show experimental data for the potential-dependence in typical potential regimes of cyclic voltammetry. The response of potential to the strain was measured using a lock-in technique. Aqueous H2SO4 and HClO4 electrolytes were used. We found that the electrode potential, E, linearly depends from the strain, at least within the potential range from -0.8 V up to 1.6 V vs Ag/AgCl - the range accessible in aqueous electrolytes. However, the amplitude of the potential-strain response depends significantly on E within the double layer - possibly due to the two factors specific ionic adsorption or double layer capacitance. According to our model the response parameter provides access for quantifying the amount of the charge transferee - the measure typically not accusable by over techniques.