By Wang Joseph
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Extra info for Analytical Electochemistry. Second Edition
26 FUNDAMENTAL CONCEPTS C. M. Oliveira Brett, Electrochemistry: Principles, Methods and Applications, Oxford University Press, Oxford, 1993. D. Diamond, Chemical and Biological Sensors, Wiley, New York, 1998. E. Gileadi, Electrode Kinetics, VCH Publishers, New York, 1993. P. Kissinger and W. ), Dekker, New York, 1996. J. Janata, Principles of Chemical Sensors, Plenum Press, New York, 1989. J. Koryta and J. Dvorak, Principles of Electrochemistry, Wiley, Chichester, 1987. P. Rieger, Electrochemistry, Prentice-Hall, Englewood Cliffs, NJ, 1987.
Measurements of the double-layer capacitance provide valuable insights into adsorption and desorption processes, as well as into the structure of ®lm-modi®ed electrodes (6). Further discussion of the electrical double layer can be found in several reviews (5,7±11). 1-4 ELECTROCAPILLARY EFFECT Electrocapillarity is the study of the interfacial tension as a function of the electrode potential. Such a study can provide useful insight into the structure and properties of 1-4 ELECTROCAPILLARY EFFECT 23 the electrical double layer.
The exchange current density for common redox couples (at room temperature) can range from 10À 6 mA cmÀ2 to A cmÀ2 . , the extra potential beyond the equilibration potential leading to a net current i). The overvoltage is always de®ned with respect to a speci®c reaction, for which the equilibrium potential is known. Equation (1-26) can be used for extracting information on i0 and a, which are important kinetic parameters. For suf®ciently large overvoltages (Z > 118 mV=n), one of the exponential terms in equation (1-26) will be negligible compared with the other.
Analytical Electochemistry. Second Edition by Wang Joseph