Study Of The Properties Of Electrolyte (La_1-xSr_x)_0.2Ce_0.8O_2-δ And (La_0.95-xSr_xBa_0.05)_0.2Ce_0.8O_2-δ For Intermediate Temperature Solid

Solid oxide fuel cells have the promise to improve energy efficiency and to providesociety with a clean energy producing technology. Solid oxide fuel cells are quiet andnonpolluting and their inherent high efficiency leads to lower greenhouse gas emissions. Asthe core component of Solid oxide fuel cells, Electrolyte plays a crucial role in theperformance of the cell. For the moderate temperature Solid oxide fuel cells, the CeO2-basedelectrolyte material is a promising alternative of ZrO₂（8%Y₂O₃） electrolyte materials. Atpresent, research of the CeO₂-based electrolyte materials are mainly focus on the mixeddoping, preparation of double-layer electrolyte and composite electrolyte. In this work, theeffect of doped element (La³⁺, Sr²⁺, Ba²⁺) to CeO₂on the electrochemical properties of thetype of electrolyte was investigated.The powders of the electrolyte (La_1-xSr_x))_0.2Ce_0.8O_2-δ(La_1-xSrxBa_0.05)_0.2Ce_0.8O_2-δ（x=0.05,0.10,0.15,0.20） were prepared by Sol-Gel and the low temperature combustion method.An anode supported Ni-Ce_0.8La_0.09Sr_0.01︱CLS₁₄₅₀︱Sm_0.3Ba_0.2Sr_0.5Co_0.8Fe_0.2O₃wasprepared by dry-pressing method. Then discuss the structure and the performance of thematerial. The crystal structure is characterized by X-ray diffraction, The microstructures ofelectrolyte were characterized by scanning electron microscope, The electrical conductivityof electrolyte in air is investigated using two-probe ac impedance technique and Theperformance of single cell was measured by Digital Source-Meter. The results show that thepowder of (La_1-xSr_x))_0.2Ce_0.8O_2-δ(La_1-xSrxBa_0.05)_0.2Ce_0.8O_2-δhas being only the cubicfluorite structure after being sintered for5h at800oC in the air; the powder was easily sinter-ed into highly dense ceramic pellets at1450℃; the sintering process was promoted with theincrease of doping level; with the increase of x value, the ionic conductivity of electrolyte(La_1-xSr_x))_0.2Ce_0.8O_2-δ(La_1-xSrxBa_0.05)_0.2Ce_0.8O_2-δfirst increases and then decreases; thesingle cells based on anode by dry pressing have higher power density values within therange of intermediate-temperatures.