Preparation and Characterization of Samaria-Doped Ceria Electrolyte Materials for Solid Oxide Fuel Cells

摘要: The microstructure, thermal expansion, mechanical property, and ionic conductivity of samaria-doped ceria (SDC) prepared by coprecipitation were investigated in this paper. results revealed that the average particle size ranged from 10.9±0.4 to 13.5±0.5 nm, crystallite dimension varied 8.6±0.3 10.7±0.4 specific surface area distribution 62.6±1.8 76.7±2.2 m2/g for SDC powders coprecipitation. dependence lattice parameter, a, versus dopant concentration, x, Sm3+ ion shows these solid solutions obey Vegard's rule as a (x)=5.4089+0.10743x Ce1−xSmxO2−1/2x. For ceramics sintered at 1500°C 5 h, bulk density was over 95% theoretical density; maximum conductivity, σ800°C=(22.3±1.14) × 10−3 S/cm with minimum activation energy, Ea=0.89±0.02 eV, found Ce0.80Sm0.20O1.90 ceramic. A dense Ce0.8Sm0.2O1.9 ceramic grain 0.5–4 μm can be obtained controlling soaking time 1500°C. When increased, microhardness toughness slightly decreased, which related growth time.