Effect of molecular mobility on kinetics of an electrochemical Langmuir-Hinshelwood reaction

A simple model to study the kinetics of a Langmuir-Hinshelwood surface reaction is developed and applied to the oxidation of a complete monolayer of CO molecules at a metal/electrolyte interface in a potential-step experiment. A dramatic influence of the molecular mobility on the reaction kinetics is found. The present model is able to connect the simple Langmuir-Hinshelwood kinetics to that predicted by Kolmogoroff-Avrami theory since it includes them as the two limiting cases of high and low mobility, respectively.