Potential Step in an Infinite Solution—Explicit Method

Potential Step in an Infinite Solution—Explicit Method 

Consider a reaction at an electrode in a solution of oxidized species O of concentration c.  

At a certain time (t 0), a potential step is applied so that O is reduced at the electrode and the concentration of O at the electrode is zero, i.e., in terms of dimensionless concentrations, Cqj = Cq j/c = 0.0, where the superscript o represents oxidized species, and subscripts represent a distance o x h away from the electrode and a time j xk after the potential step is applied. Once the reaction is proceeding, the rate at which 0 is consumed at the electrode is equal to the rate at which R is produced, i.e.. 

Let us use equal spacings to begin with then from Fig. 6.3(a), Eq. (16) becomes  

Though superscripts and subscripts are cumbersome, they help identify parameters. 

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