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Electrocatalytic Reduction of Oxygen at Anthraquinonedisulfonate/Polypyrrole Composite Film Modified Electrodes and Its Application to the Electrochemical Oxidation of Azo Dye
Author(s) -
Zhang Guoquan,
Zhao Sha,
Yang Fenglin,
Liu Lifen
Publication year - 2009
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.200804664
Subject(s) - electrochemistry , cyclic voltammetry , polypyrrole , amaranth , electrode , inorganic chemistry , rotating disk electrode , chemistry , composite number , materials science , nuclear chemistry , composite material , food science
We report here the electrocatalytic reduction of oxygen on thin anthraquindisulfonate (AQDS)/poplypyrrole (PPy) composite film modified electrodes and its application to the electrooxidation of azo dye‐amaranth. The polymer‐coated cathode exhibited good electrocatalytic activity towards oxygen reduction reaction (ORR), and allowed the formation of strong oxidant hydroxyl radical ( . OH) in the medium via Electro‐Fenton's reaction between cathodically generated H 2 O 2 and added or regenerated Fe 2+ . The electrochemical behaviors of ORR in various pH solutions were described using cyclic voltammetry (CV), rotating disk electrode (RDE) and chronoamperometric (CA) techniques. The effect of solution pH on amaranth mineralization by the Fe 2+ /H 2 O 2 and Fe 3+ /H 2 O 2 electrooxidation systems was studied. In addition, the long‐term electrocatalytic activity and stability of the AQDS/PPy composite film during multiple experimental runs were also examined electrochemically.