ИСТИНА

Bimetallic PtNi/CNTNaOH catalysts synthesized on nanotubes have been developed to reduce the platinum content in the catalyst composition. These catalysts are characterized by increased activity and stability. The most important property of catalysts is their tolerance to CO impurities in hydrogen in the oxidation reaction of hydrogen in an alkaline electrolyte. PtNi catalysts with Pt contents of 10 and 40 wt.% were synthesized. The electrochemically active surface (SEAS Pt) of PtNi catalysts is significantly reduced (~37 m2/g) compared to Pt/CNT NaOH (76 m2/g), with a similar Pt content in the composition (10 wt. %). Consequently, part of the Pt surface is covered with nickel oxides, which is confirmed by XPS data. Nickel dioxide provides a large hydrophilic surface area, exceeding the total specific surface area. A similar effect was considered in1. The presence of OH - ions near the active sites of H2 adsorption ensures2 effective oxidation of H2. Tests of the synthesized PtNi/CNTNaOH catalysts were carried out as part of membrane-electrode assembly of alkaline fuel cells.