Electrocatalytic Oxidation of Sugars at Ag Ad-layer Modified Au(100) Electrodes in Alkaline Solutions

Abstract

Ag ad-layer modified Au(100) and Au(111) electrodes showed excellent catalytic behavior for oxidation of aldose type (such as glucose, maltose, galactose and xylose) sugars. The best catalytic effect was observed at a (√2 × 5√2)R 45° Ag-Au(100) electrode, 2/5 monolayer of Ag on Au(100), where the oxidation of glucose began at −0.7 V (vs. Ag/AgCl) with a negative shift of ca. 0.2 V in oxidation potential compared to the oxidation at a bare Au(100) electrode. As was observed at a (√3 × √3)R 30° Ag-Au(111) electrode, 1/3 monolayer of Ag on Au(111), the catalytic oxidation of glucose was also seen at Au(111) film electrodes with large surface areas after deposition of Ag ad-layer.