A method for maintaining a constant potential variation during galvanostatic regulation of electrochemical impedance measurements
✍ Scribed by Paul T. Wojcik; Pankaj Agarwal; Mark E. Orazem
- Book ID
- 103067926
- Publisher
- Elsevier Science
- Year
- 1996
- Tongue
- English
- Weight
- 563 KB
- Volume
- 41
- Category
- Article
- ISSN
- 0013-4686
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✦ Synopsis
An algorithm is described in which galvanostatic regulation of electrochemical impedance measurements is conducted with an amplitude of current perturbation that is adjusted at each frequency to yield a desired variation in potential. Measurements at previous frequencies are used to estimate the value of the impedance at the target frequency. The algorithm was implemented using LabView for Windows@ on an IMB-compatible computer. Experimental results illustrate artifacts which can arise as a result of galvanostatic measurement with a fixed current amplitude or as a result of potentiostatic measurements for systems with a changing corrosion potential.