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.
Keywords: electrochemistry; impedance; analytical chemistry; fast impedance measurements.
*Paper presented at the 40th IUPAC Congress, Beijing, China, 14-19 August 2005. Other presentations are published in this issue, pp. 889-1090.