Reduction of Oxygen and Oxidation of Carbon Monoxide at the Gold Electrode Bonded on Ion Exchange Membrane

The gold electrode bonded on Nafion-117 ion exchange membrane (Au-SPE)was prepared by the reduction of HAuCl_4. The voltammetric relation of the Au-SPE electrodewas measured by the potential sweep method in the acid and in the alkaline solutiom,separately.The current efficiencies of the reduction of O_2 to H_2O_2 were also determined in the acid solutionand in the alkaline solution, separately.It was discovered that the electro-reduction processis controlled by the masstransfer proccss of the dissolved oxygen in the solution of the cathodiccompaitment.The proper potential for tbe electiooxidation and the detection of CO in air is,0.3 V vs. Hg/HgO reference electrode. The limitting oxidation currents were correlated tothe percentage concentrations of CO in air.The tempolary poison of the Au-SPE electrode byCO existed.