期刊
SENSORS AND ACTUATORS B-CHEMICAL
卷 107, 期 2, 页码 716-721出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.snb.2004.11.075
关键词
ascorbate sensor; electrocatalysis; polyaniline
Electrochemical oxidation of ascorbate at polyaniline-modified electrode has been studied. The autocatalytic reaction mechanism has been proposed for anodic oxidation of ascorbate in nearly pH-neutral buffered solutions: protons liberated during ascorbate oxidation cause a local pH drop within a thin polyaniline layer, turning it into a proton-doped conducting form that shows electrocatalytic activity towards oxidation of ascorbate. The proposed mechanism explains the ability of polyaniline to electrocatalyze the anodic oxidation of ascorbate even in pH-neutral solutions, where polyaniline presents in its undoped and non-conducting form. It has been shown that polyaniline-modi tied electrodes can be used for ascorbate assay within a pH range of 5.5-7.2, operating potential window of 0.1-40 V versus Ag/AgCl, showing a linear range of response up to 0.6 mM, and a lower detection limit of 0.05 mM. (c) 2004 Elsevier B.V. All rights reserved.
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