METHOD FOR MANUFACTURING A CATALYTIC LAYER OF ELECTRODES FOR A SOLID POLYMER FUEL CELL Russian patent published in 2022 - IPC B01J21/18 B01J23/42 B05D5/12 H01M4/88 B01J37/16 B01J37/18 

FIELD: power industry.

SUBSTANCE: invention relates to the field of electrochemical energy generation by recombination of hydrogen in electrochemical devices, for example, in a fuel cell with a solid polymer electrolyte (FC with SPE), namely, to a method for manufacturing a catalytic electrode layer of a membrane-electrode block of a hydrogen-air fuel cell. A method for manufacturing a catalytic layer of electrodes for a solid polymer fuel cell is proposed, which consists in impregnating a microporous layer deposited on a substrate, which is a hydrophobized carbon gas diffusion layer, by spraying on it the gas phase of vapors of water-organic alcohol with an organic component content from 10 to 50 wt. % solution of hexachloroplatinic acid and ionomer; the chemical reduction of the precursor acid from Pt⁺⁴ to Pt⁰ to metal particles of the platinum catalyst in the reaction volume is carried out with hydrogen gas in the reactor at a temperature above 130°C with pre-drying-cleaning of the electrodes from organic solvents or sodium borohydride at a temperature of about 80°C with washing of the electrodes with deionized water and drying them or ethylene glycol at a temperature of about 180° with washing the electrodes with deionized water and drying them; or, the carrier is impregnated, as which arrays of carbon nanotubes or graphene-like materials can be used, with a solution of a precursor: hexachloroplatinic acid H₂PtCl₆ in a container until the carrier is completely saturated and then dried; fine spraying is carried out on a substrate, which is a hydrophobized carbon gas diffusion layer, of a suspension of an impregnated carbon carrier, an ionomer and alcohol; the chemical reduction of the precursor acid from Pt⁺⁴ to Pt⁰ to metal particles of the platinum catalyst in the reaction volume is carried out with hydrogen gas in the reactor at a temperature above 130°C with pre-drying/cleaning of the electrodes from organic solvents or sodium borohydride at a temperature of about 80°C with washing of the electrodes with deionized water and drying them or ethylene glycol at a temperature of about 180°C with washing the electrodes with deionized water and drying them.

EFFECT: increase in the active surface of the catalyst, electronic conductivity and degradation stability of the catalytic layer of the electrode, leading to an increase in the power characteristics of the fuel cell manufactured on the basis of this electrocatalyst.

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