METHOD FOR LIQUID-PHASE SYNTHESIS OF NANOCERAMIC MATERIALS IN SYSTEM OF LAO-MNO-NIO FOR PRODUCING CATHODE ELECTRODES OF SOLID OXIDE FUEL CELL Russian patent published in 2021 - IPC H01M4/88 H01M8/12 B82B3/00 

FIELD: chemistry.

SUBSTANCE: invention relates to a method of producing solid oxide fuel cells by directed liquid-phase synthesis based on a method for combined crystallisation of nitrate salts for producing precursor powders and ceramic oxide nanocomposites of a given chemical composition in La₂O₃-Mn₂O₃-NiO system. Initial reagents used are lanthanum nitrate salts ((La(NO₃)₃⋅6H₂O)), nickel (Ni(NO₃)₂⋅6H₂O) and manganese ((MnNO₃)₂⋅6H₂O), from which solutions with concentration of 0.5 M are prepared, obtained solutions are mixed taking into account a given stoichiometric ratio of oxides La₂O₃:Mn₂O₃ = 1:1 and evaporated on a steam bath for 3 hours to form a supersaturated solution, thereafter synthesized solid solution powder composition LaMn_0.6Ni_0.4O₃ and a lanthanum manganite LaMnO_3, nickel manganites NiMnO₃ and lanthanum nickelite LaNiO₃ are subjected to thermal treatment at 900 °C, wherein powder is added to powdered additive in form of 15 % polyvinyl alcohol solution, then compacts are pressed at 100 MPa, after that it is sintered in air at temperature 1200–1300 °C for 2 hours at heating rate of 350–400°/h. This technology of liquid-phase synthesis of multicomponent ceramic materials in system La₂O₃-Mn₂O₃-NiO is suitable for creation of electrodes of solid oxide fuel element.

EFFECT: technical result is obtaining electrode materials, having mainly electronic conductivity, with electron transfer numbers te = 80–98 % in temperature range 500–700 °C.

1 cl, 10 dwg, 2 tbl