Synthesis, Composition, Structure, and Electrochemical Behavior of Platinum-Ruthenium Catalysts

The bimetallic PtRu nanoparticles deposited on the carbon support with the metals' atomic ratio of 1:1 have been obtained by different liquid-phase synthesis methods. The metals' mass fraction in the obtained PtRu/C catalysts is about 27%. The average size of the bimetallic nanoparticles ranges from 1.9 to 3.9 nm. The activity of the obtained PtRu/C catalysts in the methanol electrooxidation reaction as well as their tolerance to intermediate products of its oxidation have been studied. The sample synthesized by the polyol method has proved to be the most active material. The values of its electrochemical surface area and activity in the methanol electrooxidation reaction are 1.5-1.7 times higher than those of the commercial PtRu/C analogue. Nevertheless, the use of the polyol method leads to losses of the metals during the synthesis. Therefore, this method needs further optimization.