Abstract
IrO 2-coated titanium plate electrocatalysts prepared by a dip-coating method (IrO 2/Ti) with different calcination temperatures are characterized by scanning electron microscope, X-ray diffraction and X-ray photoelectron spectroscopy. The electrocatalytic behavior of the oxygen reduction reaction (ORR) is evaluated by cyclic voltammetry and galvanostatic electrolysis in 1 mol dm −3 KOH solution. The effects of calcination temperature on the oxygen reduction pathway are examined. Galvanostatic electrolysis results show that the reaction pathway on the IrO 2/Ti electrode prepared at high calcination temperature is mainly a two-electron pathway producing H 2O 2. It is observed that higher calcination temperatures produce: a more uniform fault-free surface; reduced levels of Cl contamination (residual Cl presumably from incomplete IrCl 3 decomposition during the coating process); higher levels of rutile character of the IrO 2 layer; lower hydration levels. It is confirmed that ORR electrocatalytic behavior on highly hydrated IrO 2 is better than on slightly hydrated IrO 2.
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