Electrocatalytic Reduction of Oxygen at Anthraquinonedisulfonate/Polypyrrole Composite Film Modified Electrodes and Its Application to the Electrochemical Oxidation of Azo Dye |
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| Authors: | Guoquan Zhang Sha Zhao Fenglin Yang Lifen Liu |
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| Institution: | Key Laboratory of Industrial Ecology and Environmental Engineering, MOE, School of Environmental and Biological Science and Technology, Dalian University of Technology, Dalian 116024, P.?R. China |
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| 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 (.OH) in the medium via Electro‐Fenton's reaction between cathodically generated H2O2 and added or regenerated Fe2+. 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 Fe2+/H2O2 and Fe3+/H2O2 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. |
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| Keywords: | Anthraquinonedisulphonate Composite film Electro‐Fenton Modified electrode Oxygen reduction reaction Polypyrrole |
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