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In this article we show that iron perchlorinated phthalocyanine (FePcCl16), adsorbed on an OPG electrode, acts as a catalyst for the electrooxidation of 2-mercaptoethanol (R-SH), lowering the overpotential of the reaction by near 0.3 V, compared to the unmodified OPG. A Tafel slope close to 0.12 V/decade was observed, indicating that the first electron-transfer is rate determining. Chemical orders of one in R-SH and in OH− are obtained. The linearity of a plot of log I vs. log [RSH] indicates that this system could have potential applications in the amperometric detection of thiols.
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Aguirre et al. (1998) studied this question.
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