The complex oxidation of glucose at the surface of gold electrodes was studied in detail in different conditions of pH, buffer and halide concentration. As observed in previous studies, an oxidative current peak occurs during the cathodic sweep showing a highly linear dependence on glucose concentration, when other electrolyte conditions are unchanged. The effect of the different conditions on the intensity of this peak has stressed the limitations of the previously proposed mechanisms. A mechanism able to explain the presence of this oxidative peak was proposed. The mechanism takes into account ion-sorption and electrochemical adsorption of OH−, buffer species (K2HPO4/KH2PO4) and halides.
Mechanism of glucose electrochemical oxidation on gold surface / M. Pasta, F. La Mantia, Y. Cui. - In: ELECTROCHIMICA ACTA. - ISSN 0013-4686. - 55:20(2010 Aug), pp. 5561-5568. [10.1016/j.electacta.2010.04.069]
Mechanism of glucose electrochemical oxidation on gold surface
M. PastaPrimo
;
2010
Abstract
The complex oxidation of glucose at the surface of gold electrodes was studied in detail in different conditions of pH, buffer and halide concentration. As observed in previous studies, an oxidative current peak occurs during the cathodic sweep showing a highly linear dependence on glucose concentration, when other electrolyte conditions are unchanged. The effect of the different conditions on the intensity of this peak has stressed the limitations of the previously proposed mechanisms. A mechanism able to explain the presence of this oxidative peak was proposed. The mechanism takes into account ion-sorption and electrochemical adsorption of OH−, buffer species (K2HPO4/KH2PO4) and halides.
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