CeO2-based PrxGdxSm0.2-2xCe0.8O2-δelectrolyte materials(PGSC0,PGSC2,PGSC4,PGSC6,PGSC8,PGSC10,x = 0,0.02,0.04,0.06,0.08,0.10)co-doped with Pr,Sm and Gd were synthesized by glycine-nitrate method(GNP),and their electro-chemical properties were characterized.XRD results show that PGSC electrolyte forms cubic fluorite structure after calcination at 600℃for 10 h.Raman spectroscopy test results show that co-doping of Sm,Pr and Gd can effectively increase the oxygen vacancy concentra-tion.At 800℃,the conductivity of PGSC10 electrolyte is about 0.1 S·cm-1,which is roughly the same as that of Sm0.2Ce0.8O1.9(SDC)(0.115 S·cm-1)electrolyte,while below 700℃,the conductivity of PGSC10 electrolyte is about 1.5 times that of SDC,and its activa-tion energy is 0.377 eV.It is also significantly lower than SDC(0.626 eV).Therefore,PGSC10 is a promising medium temperature solid oxide fuel cell electrolyte material.
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