Theory of Steady--State Current--Voltage Curves of Redox Electrode Reactions in Hydrodynamic Voltammetry. I. Laminary Stagnation-Point Flows

摘要

An electrode arrangement is presented, in which a blunt-nosed body of revolution is immersed in a laminar parallel flow and a part of the body in the neighborhood of forward stagnation point is working as an indicating electrode. For such electrode, which is called as stagnation-point electrode, the theoretical expressions for the stationary current--voltage curves of redox-electrode reactions without and with preceding homogeneous reactions are derived. It is shown, that the current distribution on the surface of stagnation-point electrode is always uniform and these circumstances make the exact treatment of mass transfer possible with consideration of kinetics, especially for electrode reactions with complicated reaction mechanism. Finally the conditions for the extent of stagnation-point electrodes are obtained. (ERA citation 04:024058)