The differential equation describing the transient behavior of activation overpotential has been revised to take into consideration the fact that the sum ~c -t-aA does not equal one. Exact and approximate solutions to this equation are given. Using a digital computer program, estimates of the electrode kinetic parameters have been obtained from single charging curves. The values so calculated are in good agreement with those obtained by extrapolation and slope of Tafel lines drawn from several charging curves.
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