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Catalytic Electrooxidation of 2‐Mercaptoethanol on Perchlorinated Iron Phthalocyanine Adsorbed on a Graphite Electrode
Author(s) -
Aguirre María Jesús,
Isaacs Mauricio,
Armijo Francisco,
Bocchi Nerilso,
Zagal José H.
Publication year - 1998
Publication title -
electroanalysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.574
H-Index - 128
eISSN - 1521-4109
pISSN - 1040-0397
DOI - 10.1002/(sici)1521-4109(199807)10:8<571::aid-elan571>3.0.co;2-7
Subject(s) - overpotential , tafel equation , phthalocyanine , chemistry , catalysis , electrode , electron transfer , inorganic chemistry , amperometry , adsorption , graphite , photochemistry , electrochemistry , organic chemistry
In this article we show that iron perchlorinated phthalocyanine (FePcCl 16 ), 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.