Approximate Kinetic Expressions for Electrocatalytic Reactions on Heterogeneous Surfaces

Approximate Kinetic Expressions for Electrocatalytic Reactions on Heterogeneous Surfaces 

The approach differs from the more rigorous approach discussed in section 2 of this chapter. Models for heterogeneous surfaces are introduced for which the effect of the heterogeneity is expressed solely in 

Kinetic equations were derived by Temkin [12] for electrocatalytical reactions occurring on a surface for which the heat of adsorption W of the intermediate varies in a linear fashion between and W2  

The parameter s has values between 0 and 1 across the surface. The part of the surface for which the heat of adsorption is greater than or equal to W is designated by s. The Volmer reaction (compare Eq. IV, 17 and IV, 22) can be written [12] in a range of medium coverage 0 with hydrogen atoms  

Here f denotes a constant. At equilibrium Eq. 4 leads to a linear dependence of 0 upon (0M —0s)- 

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