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Ascorbic Acid Oxidation at Nonmodified and Copper‐Modified Polyaniline and Poly‐ ortho ‐methoxyaniline Coated Electrodes
Author(s) -
Komsiyska Lidiya,
Tsakova Vessela
Publication year - 2006
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/elan.200503464
Subject(s) - polyaniline , ascorbic acid , overpotential , copper , redox , electrochemistry , chemistry , electrode , polymer chemistry , inorganic chemistry , polymer , materials science , polymerization , organic chemistry , food science
The electrochemical oxidation of ascorbate ions is comparatively studied at polyaniline (PANI) and poly‐ ortho ‐methoxyaniline (POMA) layers in absence and presence of electrodeposited copper species. In comparison to PANI, POMA layers allow decreasing the overpotential necessary for driving the ascorbate oxidation reaction. A nonlinear dependence of the ascorbate oxidation current on the polymer layer redox charge is found. Copper electrodeposited in PANI and POMA layers is electrocatalytically active for the investigated reaction. Two separate oxidation waves are observed in the case of Cu‐PANI whereas a single ascorbate oxidation wave and enhanced currents are found in the Cu‐POMA case.