ELECTROCATALYST FOR SOLID POLYMER FUEL CELLS AND METHOD FOR ITS PREPARATION Russian patent published in 2023 - IPC B01J23/42 B01J23/62 H01M4/88 H01M4/92 

FIELD: electrochemistry.

SUBSTANCE: invention relates to proton exchange membrane fuel cells that use hydrogen as fuel, as well as direct methanol and ethanol fuel cells. An electrocatalyst for a solid polymer fuel cell comprising at least 20 wt.% platinum on a carrier is proposed, characterized in that the carrier is a macroporous tin (IV) oxide doped with antimony (V) in an amount of 1-10 wt%, the electrocatalyst has a pore volume not less than 0.1 g/cm³, specific area - not less than 20 m²/g, average size of spherical macropores 100-550 nm, share of macropores in the total pore volume not less than 30%. A method is also proposed for producing an electrocatalyst by reducing the crystalline hydrate of chloroplatinic acid in an environment of ethylene glycol, alkali and a support, which is a macroporous tin (IV) oxide doped with antimony (V), which is obtained by template synthesis using polystyrene microspheres with a diameter of 160 to 800 nm.

EFFECT: increased electrochemical stability of platinum catalysts based on tin(IV) oxide without loss of activity.

3 cl, 1 tbl, 4 ex