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OwnerGalina Hilchenko, Ata Atayevichinventors
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This invention relates to the field of electric power generation by direct transformation of the chemical energy of gaseous fuel to electric power by means of high-temperature solid oxide fuel cells. The invention can be used for the fabrication of miniaturized thin filmed oxygen sensors, in electrochemical devices for oxygen extraction from air and in catalytic electrochemical devices for waste gas cleaning or hydrocarbon fuels conversion. The technical objective of the invention is the production of a low-cost electrode-electrolyte pair having an elevated electrochemical efficiency as the most important structural part of a highly efficient, economically advantageous and durable fuel cell. Furthermore, the invention achieves additional objectives. The achievement of these objectives is exemplified with two electrode-electrolyte pair designs and their fabrication methods, including with the use of a special organogel.
Electrode-electrolyte pair comprising a porous electrode to the surface of which is deposited a multilayered solid electrolyte based on bismuth oxide with stabilizing additions, the solid electrolyte consisting of the inner nanoporous three-dimensional solid electrolyte layer of combined amorphous and crystalline structure which fills, at least partially, the surface pores of the microporous electrode to a depth of 2-50 μm, and a dense outer electrode layer of combined amorphous and crystalline structure located on the surface of said inner layer.
Electrode-electrolyte pair fabrication method comprising the formation, on the porous electrode surface, of a partially electrode-penetrating multilayered solid electrolyte based on bismuth oxide with stabilizing additions, to which end the porous electrode surface is initially impregnated with organogel consisting of particles of bismuth oxide with stabilizing additions and an organic solution containing organic salts of cerium and the stabilizing additions, and destruction of the organogel organic part that leads to the chemical deposition of the inner three-dimensional multilayered solid electrolyte layer on the electrode surface, following which the inner organogel layer is deposited onto the surface, said layer consisting of nanosized particles of bismuth oxide with stabilizing additions and an organic solution containing organic salts of bismuth and the stabilizing additions, and destruction of the organogel organic part that leads to the chemical deposition of the dense outer layer of the multilayered electrolyte onto the inner layer surface.
Organogel used for the fabrication of the electrode-electrolyte pair contains nanosized particles of bismuth oxide with stabilizing additions and an organic solution containing organic salts of bismuth and the stabilizing metals, a mixture of α-branching carbonic acids with the general formula H(CH2—CH2)nCR′R″—COOH, where R′ is CH3, R″ is CmH(m+1) and m is from 2 to 6, with an average molecular weight of 140-250.
Dependencies are inferred from the claim text.