Chapter 19, Problem 19D.4AE

Interpretation Introduction

Interpretation:

The current density in the given reaction at $0.20V$ has to be calculated by using Bulter-Volmer equation and Tafel equation.  Also the validity of Tafel equation has to be described.

Concept Introduction:

When the over potential is large and positive $\left(\eta \ge 0.12V\right)$, the anodic process is dominant. The current density is given by

  $\text{J}\text{=}{\text{J}}_{\text{0}}{\text{e}}^{\text{(1-α)}}{}^{\text{fη}}$

The Bulter-Volmer equation:

  $J=J_0\left\{e^{\left(1-\alpha \right)f\eta }-e^{-\alpha f\eta }\right\}$