Effectiveness factor of isopropanol oxidation on IrO2 based electrodes of different loading

The influence of IrO2 loading on the effectiveness factor Ef of the electrochemical oxidation of isopropanol was investigated. A model has been proposed based on three main reactions: electrochemical IrO2 oxidation to IrO3, chemical oxidation of the organic compound via IrO3 and O2 evolution via decomposition of IrO3. It has been found that the relative effectiveness factor Ef for the electrochemical oxidation of IrO2 to IrO3 is loading independent contrary to the chemical reaction which decreases with increasing IrO2 loading.