Preparation And Performance Of Ce_1-xRe_xO_2-σ（Re=Sm,Gd）-BaCe_0.8Y_0.2O（3-σ） Composityte And Application For Intermediate-temperature Solid Oxide Fuel Cells

The solid oxide fuel cell （SOFC） is a new green energy, research itshigh-performance is one of the keys to solve the energy crisis. The electrolyteis the heart of the SOFC， its performance directly affects the overallperformance of the battery. This article embarks from the increase in the SOFCelectrolyte performance to Re（Re=Sm, Gd） doped CeO₂based electrolytesas the main research object, repared Ce_1-xRe_xO_2-δ（Re=Sm,Gd） and BCYcomposite electrolyte material, Consolidated play two composition of theelectrolyte material advantages and overcome the shortcomings of the singleelectrolyte. And studied the influence of different sintering temperature on theperformance, and find the best sintering temperature electrolyte.The electrolyte material Ce_0.85Sm_0.15O_1.925（SDC） were synthesized bymeans of glycine-nitrate process（GNP） and then the BaCe_0.8Y_0.2O_3-δ（BCY）were prepared by sol gel process。Afterwards，composite SDC with a smallamount of BCY，the prepare different proportion of composite electrolytematerials. We studyed the structure and properties of composite electrolytes inthe present work. The results showed that the relative density of everycomposite electrolytes SDC-BCY is higher than SDC.The highest conductivityof the composite electgroyte wherein the sintering temperature is1350℃.SOFC were fabricated with Ni0.9Cu0.1-SDC as anode andBaCo0.7Fe0.22Nb0.08O3-δas cathode,then measure the power density of cells.Single cell tests show that, as the test temperature rises, the open-circuitvoltage of each of the samples decreased, the power density is increased; each sample sintered at a temperature, the maximum power density of thecomposite electrolyte SDC-BCY is higher than the electrolyte SDC; Among theSintering temperature of the composite electrolyte SDC-BCY, the one with1350℃showed the maximum power output density378.62mW/cm²at750℃.The electrolyte material Ce_0.9Gd_0.1O_1.95（GDC） were synthesized bymeans of glycine-nitrate process（GNP） and then the BaCe_0.8Y_0.2O_3-δ（BCY）were prepared by sol gel process。Afterwards，composite GDC with a smallamount of BCY，the prepare different proportion of composite electrolytematerials. We studyed the structure and properties of composite electrolytes inthe present work. The results showed that the relative density of everycomposite electrolytes GDC-BCY is higher than GDC.The highest conductivityof the composite electgroyte wherein the sintering temperature is1300℃.SOFC were fabricated with Ni0.9Cu0.1-SDC as anode andBaCo0.7Fe0.22Nb0.08O3-δas cathode,then measure the power density of cells.Single cell tests show that, as the test temperature rises, the open-circuitvoltage of each of the samples decreased, the power density is increased;each sample sintered at a temperature, the maximum power density of thecomposite electrolyte GDC-BCY is higher than the electrolyte GDC; Amongthe Sintering temperature of the composite electrolyte GDC-BCY, the one with1350℃showed the maximum power output density334.14mW/cm²at750℃.