Jt. Orr et al., ANODIZATION OF COPPER MICROELECTRODES IN A COMPLEXING MEDIUM - DETERMINATION OF STABILITY-CONSTANTS OF PRODUCTS, Analytical chemistry, 67(15), 1995, pp. 2714-2722
A model is presented for the anodization of a metal electrode by norma
l pulse voltammetry in complexing medium, The analysis is based on ana
lytical expressions for current during normal pulse voltammetry at a m
icroelectrode, It is applied to the anodization of a copper microdisk
electrode in aqueous chloride solutions. Optimization of the fit of th
e model to the data yields the overall formation constants of CuCl (K-
1) and CuCl2- (beta(2)) as log K-1 = 2.93 (+0.02, -0.05) and log beta(
2) = 5.54 (+0.12, -0.17), These values agree with those found in the l
iterature. The advantages of this analysis over traditional approaches
which employ an approximation of small current are described.