کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
219530 | 463278 | 2011 | 6 صفحه PDF | دانلود رایگان |
Mechanism of electrochemical oxidation of gallic acid in aqueous phosphate buffer solutions of different pH’s was studied at glassy-carbon electrode. The study was performed using cyclic, convolution–deconvolution sweep voltammetry, chronoamperometry and chronocoulometry. It gives two irreversible diffusion-controlled cyclic voltammetric waves at the entire range of pH. The electrochemical oxidation mechanism was proposed to be an ECEC-first order mechanism in which the two electron transfer steps and the two chemical follow-up deprotonation reactions are irreversible. The proposed mechanism was confirmed by digital simulation and the electrode kinetic parameters are estimated on comparing the simulated response with the experimental ones.
► Gallic acid is electrochemical oxidized in aqueous solution at glassy-carbon electrode.
► The electrode reaction follows an ECEC-first order mechanism.
► Electro and chemical steps are irreversible.
Journal: Journal of Electroanalytical Chemistry - Volume 657, Issues 1–2, 1 July 2011, Pages 107–112