Indexed by:期刊论文

Date of Publication:2009-11-01

Journal:ELECTROANALYSIS

Included Journals:SCIE、Scopus

Volume:21

Issue:22

Page Number:2420-2426

ISSN No.:1040-0397

Key Words:Anthraquinonedisulphonate; Composite film; Electro-Fenton; Modified electrode; Oxygen reduction reaction; Polypyrrole

Abstract: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 ((center dot)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.