Abstract
The preparation, electrochemical and catalytic behaviour of glassy carbon electrodes modified by anthra-9,10-quinone, its amino derivatives and dyes were investigated. The stability of the modified electrodes was studied by cyclic voltammetry in acidic and neutral media. The electrocatalytic ability of the modified electrodes for the reduction of dioxygen to hydrogen peroxide was examined by cyclic voltammetry, chronoamperometry and chronocoulometry techniques. The influence of pH on the electrochemical and catalytic behaviour was studied and pH 5.0–8.0 was chosen as the optimum working pH by comparing the shift in oxygen reduction potential. The anthraquinone-adsorbed glassy carbon electrodes possess excellent electrocatalytic abilities for dioxygen reduction with overpotential ranging from 280 to 560 mV lower than that at a plain glassy carbon electrode. Hydrodynamic voltammetric studies were performed to determine the heterogeneous rate constants for the reduction of O2 at the surface of the modified electrodes, mass specific activity of the anthraquinones used and the apparent diffusion coefficient of O2 in buffered aqueous O2-saturated solutions. Studies showed the involvement of two electrons in dioxygen reduction.
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Manisankar, P., Gomathi, A. & Velayutham, D. Oxygen reduction at the surface of glassy carbon electrodes modified with anthraquinone derivatives and dyes. J Solid State Electrochem 9, 601–608 (2005). https://doi.org/10.1007/s10008-004-0610-1
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DOI: https://doi.org/10.1007/s10008-004-0610-1