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

• Luz María Torres ^[1] ; Adrián F. Gil ^[1] ; Laura Galicia ^[1] ; Ignacio González ^[1]
  1. [1] Universidad Autónoma Metropolitana

     Universidad Autónoma Metropolitana

     México

     
• Localización: Journal of chemical education, ISSN 0021-9584, Vol. 73, Nº 8 (August), 1996, págs. 808-810
• Idioma: inglés
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• Resumen

  • 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.