The Coulostatic Method with Finite Pulse Width

Hannah Reller, Emilia Kirowa-Eisner

Research output: Contribution to journalArticlepeer-review


A modification of the coulostatic method is proposed in which. the charging step is performed with a finite galvanostatic pulse of several Tcunits length, instead of the usual “zero” pulse width. An equation taking into account faradaic processes and depletion during the charging step as well as during the open-circuit decay is derived. The modified method largely overcomes the problems inherent to the zero pulse width method by using relatively long pulse widths of lower current densities. Moreover, the precision of the modified method for the determination of i0is substantially increased compared to the classical coulostatic method. The conditional dependence of i„ on Cdl is lower, and the upper limit of ksis about twice as high. The optimal conditions for the estimation of i0 and Cdl are determined on the basis of the information analysis approach. The information content of i0 and Cdi are calculated for one- and two-estimate systems for different values of Tc/Tdand T/tc. The optimal conditions for the estimation of iGas a single estimate are range of pulse width tp/Tc is 5 ≤ tpTc ≤10 and range of full-time scale reading T is Tmin≤T≤tc. The upper limit for is 0.5 -2 A/cm2 (for Cd1 10–40 (μF/cm2). The upper limit for ksis 5 cm/s.

Original languageEnglish
Pages (from-to)126-132
Number of pages7
JournalJournal of the Electrochemical Society
Issue number1
StatePublished - Jan 1987


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