| Abstract
| - We describe a novel technique for measuring electrochemical impedance, in which the electrode potential isramped to a desired bias potential and a small potentialstep is applied to the working electrode after a short timedelay. Fourier transform of the first derivative of thecurrent signal thus obtained provides ac currents in thefrequency domain, which allows the computation ofimpedances of the electrode/electrolyte interface in thewhole frequency range. A home-built data acquisitionsystem for these measurements and the results obtainedtherefrom were used for the measurements. The advantage of the technique includes an extremely short time ofless than 1 ms for impedance measurements in the wholefrequency region while equilibrium conditions of theelectrochemical system are being maintained before andafter the measurements, among many others. This technique is expected to revolutionize electrochemical measurements and to find important applications such as insitu measurements during battery cycling, corrosion testing, and other electrochemical experiments.
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