No abstract

This study prepared a dense Sm-doped ceria (SDC) and an SDC carbonate composite (abbreviated as SDC-C). The latter was prepared by immersing porous SDC with a formula of (Ce 0.8 Sm 0.2 )O 1.9 and a relative density of approximately 65-70% into a molten mixture of carbonates containing 1:1 molar ratio of Li 2 CO 3 and Na 2 CO 3 at 500°C. The relative density of the SDC-C was close to 100%. In addition, SDC oxide without carbonates, which also has a relative density of close to 100%, was heat treated at 1600°C. At 500°C, the electrical conductivity and ionic transference number (t i ) of the SDC oxide were 1.79(5)1 0 -3 S·cm -1 and 0.99(2), respectively, such that electronic conduction could be disregarded. Increasing the temperature caused a gradual decrease in the t i of SDC. Following the addition of carbonates to SDC, the electrical conductivity reached 1.23(9)´10 -1 S·cm -1 at 500°C. After 14 days (340 h), the electrical conductivity of the SDC-C at 490°C, leveled off at about 6´10 -2 S·cm -1 . SDC-C could be used as a potential electrolyte in solid oxide fuel cells (SOFCs) at temperatures below 500°C.

No abstract

No abstract

No abstract