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Electrocatalytic Reduction of Dioxygen at the Surface of Glassy Carbon Electrodes Modified by Some Anthraquinone Substituted Podands
Author(s) -
Salimi Abdollah,
Eshghi Hossein,
Sharghi Hashem,
Golabi Sayed Mehdi,
Shamsipur Mojtaba
Publication year - 1999
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/(sici)1521-4109(199902)11:2<114::aid-elan114>3.0.co;2-f
Subject(s) - glassy carbon , anthraquinone , electrode , reduction (mathematics) , chemistry , carbon fibers , electrocatalyst , cyclic voltammetry , inorganic chemistry , materials science , electrochemistry , organic chemistry , geometry , mathematics , composite material , composite number
The preparation and electrochemical characterization of glassy carbon electrodes modified by some recently synthesized anthraquinone substituted podands were investigated. These compounds were found to be strongly and irreversibly adsorbed on the preanodized glassy carbon electrodes. The electrochemical behavior and stability of the modified electrodes were studied by cyclic voltammetry in acidic aqueous solutions. The influence of pH on the electrochemical behavior of the electrodes was studied and a pH of 4.5 was chosen as the optimum working pH. The ability of the modified electrodes as potential electrocatalysts for the reduction of dioxygen to hydrogen peroxide was tested by cyclic voltammetry, chronomperometry and rotating disk electrode voltammetry. They showed excellent electrocatalytic ability for the reduction of O 2 at pH 4.5 with overpotentials ranging from 380 to 470 mV lower than the plain glassy carbon electrode. The heterogeneous rate constants for the reduction of O 2 at the surface of these modified electrodes were determined by the use of Koutecky‐Levich plots. In addition, the apparent diffusion coefficients of O 2 in buffered aqueous O 2 ‐saturated solution was estimated.