Site Dependence of Charge Transfer Kinetics

The effect of the competitive adsorption on the kinetics of the copper deposition reaction is described as the product of the fractional interface cupric ion concentration C /C +°° and the coverage dependent charge transfer rate constants, k using  

The exchange current, ij corresponds to the rate-determining step for copper deposition on surface sites j and a factor of two is used to account for the overall two-electron Cu2+/Cu process. The values of iPEG and the transfer coefficient aPEG are readily determined from T -i and i-t experiments performed in a catalyst-free PEG-Cl electrolyte. Evaluation of igPS and asps is more difficult. It involves 

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