Electrochemical behavior of 0. 2 to 3 molar ferrous chloride--ferric chloride mixtures on edge-on pyrolytic graphite rotated disk electrodes
- 1 July 1977
- report
- Published by Office of Scientific and Technical Information (OSTI)
Abstract
Potentiostatic determinations in various mixtures of FeCl/sub 2/-FeCl/sub 3/ with excess HCl show rest potentials that are 0.1 V less electropositive than the theoretical values from the formulated ratios of FeII to FeIII (probably as a result of complexing). The standard rate constant k/sub s/ ranges between 1 x 10/sup -4/ and 6 x 10/sup -4/ cm/sec. Tafel slopes b of roughly 0.12 V per decade indicate single-electron exchange kinetics. No significant trend in either b or k/sub s/ was attributed to mixture composition. The higher k/sub s/ values occurred with an edge-on pyrolytic graphite that had undergone a permanent surface change.Keywords
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