The electrochemical oxidation of glucose on single crystal surfaces of gold.

摘要

n this work the reaction kinetics of glucose electrooxidation was investigated on single crystal gold electrodes with seven different orientations in phosphate buffer (pH = 7.4). The Au(100) surface was found more active than the other two low-index planes, Au(110) and Au(111). The stepped Au(755) = 6(111) x (100) surface exhibited the highest peak current. The terrace orientation, the step orientation and the step density are reflected in the reaction rate. The most desirable surface for the sensor application would have a predominant (100) orientation.;The reaction of glucose electrooxidation in phosphate buffer on gold does not appear to be suppressed by the intermediate(s) or product(s) as found for example with platinum. The currents for glucose oxidation in phosphate buffer solution on Au electrodes show a fairly linear increase with increasing concentration of glucose up to 0.01 M with the reaction order of approximately one. The reaction on Au(111) surface is the least suppressed by chloride ion in comparison with the other two low-index planes.;Glucose oxidation on polycrystalline gold was measured with the hydrogen bound to the carbon C;Glucose can be oxidized in acid solutions, but only in the absence of strongly adsorbed anions, with weakly adsorbed anions such as ClO;In-situ FTIR measurements of glucose electrooxidation on gold electrodes show that the reaction intermediate is gluconolactone. Ex-situ