Localized electrochemical impedance spectroscopy

Measixrement techniques Bridge mechanical generator Bridge electronic generator Impulse method, oscillograph, Laplace transform Analogue impedance measurement, potentiostat (AC + DC) Digital impedance measurement, cormection with computer Local electrochemical impedance spectroscopy (LEIS)... 

Remember 7.4 Local Electrochemical Impedance Spectroscopy (LEIS) is a relatively new and underutilized technique that is useful for exploring the influence cf surface heterogeneities on the impedance response. 

R. S. Lillard, R J. Moran, and H. S. Isaacs, "A Novel Method for Generating Quantitative Local Electrochemical Impedance Spectroscopy," Journal of The Electrochemical Society, 139 (1992) 1007-1012. 

Recently, two new electrochemical mapping techniques have become available the scanning vibrating electrode technique (SVET) and the localized electrochemical impedance spectroscopy (LEIS) technique. These techniques provide the capability to identify and monitor electrochemical behavior down to the micron level. These represent significant advances over traditional electrochemical methods (cyclic voltammetry, EIS, and even EQCM), which provide data that reflect only an average over the entire sample surface. Although such data are very useful, a major drawback is that no local or spatial information is obtained. 

B.B. Katemann, A. Schulte, E.J. Calvo, M. Koudelka-Hep, W. Schuhmann, Localized electrochemical impedance spectroscopy with high lateral resolution by means of alternating current scanning electrochemical microscopy, Electrochem. Commun. 4 (2002) 134-138. 

G. Baril, C. Blanc, M. Kedam, N. Pebere, Local electrochemical impedance spectroscopy applied to the corrosion behavior of an AZ91 magnesium alloy, J. Electrochem. Soc. 150 (2003) B488-B493. 

V.M. Huang, S. Wu, M.E. Orazem, N. Pebere, B. TriboUet, V. Vivier, Local electrochemical impedance spectroscopy a review and some recent developments, Electrochim. Acta 56 (2011) 8048-8057. 

Lillard and coworkers developed a method called Local Electrochemical Impedance Spectroscopy LEIS [39). It relies on the fact that ac current densities in the solution very near to the working electrode are proportional to the local impedance properties of the electrode. In order to determine the current densities normal to the surface, the ac potential drop was measured between planes parallel to the electrode surface employing a two-electrode microprobe. A schematic of a commercially available experimental setup for LEIS is... 

Lillard R. S., Kruger J., Tait W. S. Moran P. J. (1995). Using local electrochemical impedance spectroscopy to examine coating failure. Corrosion, Vol. 51, No. 4, pp. 251-259 ISSN 0010-9312. 

The local electrochemical impedance spectroscopy (LEIS) " is another scanning probe technique that can map the ac impedance distribution over an electrode surface. In LEIS a sinusoidal voltage perturbation between the working and reference electrode is maintained by driving an ac current between the working... 

R. S. Lfllard, R J. Moran and H. S. Isaacs, Novel method for generating quantitative local electrochemical impedance spectroscopy , J. Electrochem. Soc. 139, 1007 (1992). 

Takenouti, H., G. Galicia, M. Keddam, and V. Vivier, Vibrating single probe and stationary bi-probes to measure local electrochemical impedance spectroscopy, Bulgarian Chemical Communications, 38, 2006, 165. 

M.W. Wittmarm, R.B. Leggat, S.R. Taylor, The detection and mapping of defects in organic coatings using local electrochemical impedance spectroscopy, J. Electrochem. Soc., 1999,146,... 

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