Resumen de Understanding the Difference between Inner- and Outer-Sphere Mechanisms:: An Electrochemical Experiment

Luz María Torres, Adrián F. Gil, Laura Galicia, Ignacio González

• The concepts of inner- and outer-sphere mechanisms for complex charge transfer reactions in homogeneous phase have been applied to heterogeneous charge transfer reactions. The influence of these mechanisms, on the electrochemical behavior of a redox couple, is presented through comparison of the electrochemical responses obtained by cyclic voltammetry and rotating disk voltammetry in different metallic substrates, for the [Fe(CN)6]3-/[Fe(CN)6]4- in sodium nitrate (outer sphere mechanism) and Fe(III)/Fe(II) in sulfuric acid medium (inner sphere mechanism). The obtention of quantitative evidence of these differences is also showed by the calculation of the kinetic parameters for these couples.