MANUFACTURING METHOD OF SINGLE SOLID-OXIDE FUEL ELEMENT

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FIELD : power industry. SUBSTANCE : manufacturing method of single solid-oxide fuel element with nano(micro)mesoporous cathode electrode operating at temperatures of 723°K to 1073°K, including nano(micro)mesoporous cathode electrode, involves the following stages at which : (A) thermal decomposition of mixture of rare-earth nitrate, strontium nitrate and cobalt nitrate is performed with conductivity corresponding to rare-earth cobaltite activated with strontium ions, in presence of reducing reagent and oxygen; (B) initial cathode paste is prepared for cathode electrode by mixing rare-earth cobaltite activated with strontium ions, forming mechanically non-compressed reagent pores, organically binding agent and solvent or mixture of solvents as reagents forming nano(micro)mesopores for provision of high-nano(micro)mesoporous cathode electrode; (C) electrolyte is obtained from cerium oxide alloyed with gadolinium oxide or samarium oxide, by sintering at temperature of about 800°K to 1800°K with molar ratio of gadolinium oxide or samarium oxide in cerium oxide, which is activated with gadolinium oxide or samarium oxide varied depending on CeO2, prior to the above sintering, by application to the above electrolyte from cerium oxide alloyed with gadolinium oxide and samarium oxide, pressure of about 5 kN/cm2 to about 20 kN/cm2 during approximately 0.5 to approximately 15 minutes; (D) the above nano(micro)mesoporous cathode electrode and half-element is made from nano(micro)mesoporous cathode and electrolyte by burning-out of reagent which forms pores, solvent and binding agent from initial paste of cathode electrode and by sintering of the above initial paste of cathode electrode on electrolyte having oxygen ionic conductivity from cerium oxide alloyed with gadolinium oxide or samarium oxide at temperature of about 500°K to about 1773°K during approximately 60 to approximately 600 minutes; and (E) paste from Pt platinum is applied by means of screen printing method to free side of half-element of cathode/electrolyte and fuel element is sintered at temperatures of about 800°K to about 1500°K during approximately 6 to approximately 600 minutes. EFFECT : high catalytic activity and low activation energy of electrolytic reduction of oxygen. 10 cl, 34 dwg