Abstract
AbstractNovel titanium‐supported porous Pd and binary Pd‐Ru particles, nanoPd, Pd99Ru1, Pd96Ru4, Pd87Ru13, and Pd35Ru65, are obtained by using a hydrothermal method and investigated as electrocatalysts for ethanol oxidation in alkaline media. The prepared porous Pd catalyst (nanoPd) exhibits high electroactivity for ethanol oxidation in 1 M NaOH solution and further, introduction of Ru into Pd catalyst, leading to the synthesis of binary Pd99Ru1, Pd96Ru4, Pd87Ru13, and Pd35Ru65 catalysts, enhances the electroactivity for ethanol oxidation. Among the electrocatalysts investigated, the Pd87Ru13 catalyst displays the greatest electrocatalytic activity, which is characterized by the large anodic peak current density of 193.5 mA cm−2 for the positive scan and the most negative onset potential of −0.765 V for ethanol oxidation. Cyclic voltammetric responses show that ethanol oxidation on the Pd87Ru13 catalyst presents a large and wide peak current plateau on the positive‐going potential scan at higher ethanol concentrations and higher potential scan rates. In addition, electrochemical impedance spectra of the Pd87Ru13 catalyst exhibit low values of charge transfer resistances for ethanol oxidation and an obvious decline of impedance values with ethanol concentrations, showing significantly high electrocatalytic activity of the Pd87Ru13 catalyst for ethanol oxidation in alkaline solutions. The prepared binary Pd‐Ru catalysts could be promising alternatives to Pt electrodes applied in alkaline direct alcohol fuel cells.
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