Abstract
We have investigated the electrocatalytic behavior of PtxNi(1-x)Oy/Ti electrodes during the oxidation of glycerol in alkaline medium. The catalysts were prepared by thermal decomposition of polymeric precursors, and characterized by scanning electron microscopy, energy-dispersive X-ray, and X-ray diffraction. According to cyclic voltammetry and chronoamperometry experiments, mixed catalysts with different metal compositions and high electrochemical surface area, prepared by thermal decomposition of polymeric precursors, afford higher current densities at low values of potential as compared to the PtOy/Ti electrocatalyst. In addition, the onset potential for the oxidation of glycerol shifts toward less positive values, showing that the mixed electrodes facilitate oxidation as compared to the PtOy/Ti electrocatalyst. Among the tested metal compositions, the Pt0.8Ni0.2Oy/Ti and the Pt0.9Ni0.1Oy/Ti electrocatalysts display the highest electroactivity.
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