Effects of Adsorbed Anions on the Oxidation of D-Glucose on Gold Single CrystalElectrodes

摘要

The effects of various anions on the oxidation of glucose on crystal goldelectrodes were studied in HC1O4, CF3SO3H, HN03, H2SO4, H3PO4 and HC1 solutions. Contrary to common belief, glucose can be oxidized on gold in acid solutions, but only in the absence of strongly adsorbed anions such as chlorides, sulfates and phosphates. The reaction is partly or completely inhibited in solutions containing specifically adsorbed anions. The data show some indication of an (OH)ads layer on gold at potentials cathodic to +1.2 V vs. rhe in HC1O4 and CF3SO3H solutions. Based on the rates of oxidation of glucose, the following sequence has been found for the inhibition of the glucose oxidation by adsorbed