BIMETALLIC CATALYSTS WITH PLATINUM BASED GRADIENT STRUCTURE PRODUCTION METHOD Russian patent published in 2019 - IPC B01J23/89 B82B3/00 B01J21/18 B01J37/16 B01J37/34 

FIELD: technological processes.

SUBSTANCE: invention relates to the field of electrochemical energy, in particular to the fuel cells catalyst manufacturing method, and can be used for the bimetallic catalysts production, used in chemical power sources, in particular, in low-temperature fuel cells. Bimetallic catalysts with the platinum based gradient structure production method consists in the d-metal ions chemical reduction on the carbon carrier surface and the nanoparticles core formation, with the platinum ions subsequent reduction on the nuclei surface due to the platinum precursor addition to the reaction mixture and the reducing agent addition. Highly dispersed carbon carrier is subjected to preliminary homogenization in the ultrasonic disperser in the ethylene glycol aqueous solution until the stable suspension production with the surface area of at least 50 m²/g, with the d-metal subsequent four-stage recovery process from the salts solution with a concentration of 1–10 g/dm³ and platinum ions from hexachloroplatinic acid, by 50 % addition at the first stage, by 25 % at the second and third stages of the d-metal salt solution total amount, and hexachloroplatinic acid, at a concentration of 11–30 g/dm³, by 25 % addition at the second and third stages, and 50 % of the hexachloroplatinic acid solution total volume at the fourth stage, with the reducing agent excess and the medium pH value 9–10 under conditions of constant mixing and temperature of 22–24 °C with subsequent filtration and drying.

EFFECT: increase in the catalyst electrochemically active surface area and reducing the particle size, while maintaining the platinum atoms high proportion on the surface.

1 cl, 4 dwg, 21 ex