Investigation of Formic Acid Oxidation on Ti∕IrO[sub 2] Electrodes Using Isotope Labeling and Online Mass Spectrometry

In a first series of experiments the coating was labeled with (formation of ) by treatment in . Then, in a second series of experiments, this labeled electrode was used for the electrochemical oxidation of formic acid. The presence of during the anodic polarization clearly proves that the participated in the oxidation of the formic acid. Analysis of the experimental data showed that at maximum 3.7% of the surface participated in the exchange of oxygen between electrogenerated labeled and adsorbed formic acid , producing carbon dioxide and .