ИСТИНА

Studies of the catalytic activity of highly dispersed platinum alloys for obtaining efficient cathode catalysts of oxygen reduction are widely reported in the literature [1,2]. In the present work we continue to develop an approach to the preparation of bimetallic electrocatalysts, based on organometallic clusters of platinum with other metals synthesized and then subjected to thermal decomposition on highly dispersed carbon carriers at a temperature of 450°C in a hydrogen atmosphere. It has been shown previously that a distinctive feature of such catalysts is a high reproducibility in composition and uniform distribution over the carbon support, which ensures stability and reproducibility of their characteristics [3]. Bimetallic clusters of the following gross formula were synthesized: PtCo(CH3CO2)4(CH3COOH), PtNi(CH3CO2)4(CH3COOH), PtMn (CH3CO2)4(H2O), and PtZn(CH3CO2)4(CH3COOH), their structure having been confirmed by X-ray diffraction, IR and NMR spectroscopy. The prepared supported catalysts PtCo/C, PtNi/C, PtMn/C, and PtZn/C were characterized by XRD, EDAX, TEM, EXAFS and XANES methods. It has been shown both in model experiments and while testing MEAs with PtCo/C, PtMn/C, and PtZn/C, in particular, that catalysts prepared from bimetallic clusters of the corresponding metals have advantages over a commercial platinum catalyst (Pt(20%)/C) in terms of their high specific activity and are therefore promising for use in hydrogen-air fuel cells. References 1. Gasteiger H.A., Kocha S.S., Sompalli B., Wagner F.T. Appl. Catal. B 2005, 56, 9. 2. Todoroki N., Watanabe H., Kondo T. et al. Electrochim. Acta 2016, 222, 1616. 3. Grinberg V.A., Mayorova N.A., Pasynsky A.A. et al. Electrochim. Acta 2019, 299, 886.