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Pure Appl. Chem., 2006, Vol. 78, No. 5, pp. 1069-1080

Novel instrumentation in electrochemical impedance spectroscopy and a full description of an electrochemical system

Su-Moon Park, Jung-Suk Yoo, Byoung-Yong Chang and Eun-Shil Ahn

Department of Chemistry and Center for Integrated Molecular Systems, Pohang University of Science and Technology, Pohang 790-784, Gyeongbuk, Korea

Abstract: The evolution of impedance measurement methods into the current state of the art is reviewed briefly, and recent efforts to develop new instruments to make electrochemical impedance spectroscopy (EIS) measurements faster and more accurate are described. The most recent approach for impedance measurement uses a multichannel detection technique, which is analogous to a spectroscopic measurement such as in Fourier transform infrared spectroscopy. This method, which is capable of making impedance measurements in real time during an electrochemical experiment, allows us to come up with a new integrated equation that makes a full description of an electrochemical system possible.