Electro-morphological, structural, thermal and ionic conduction properties of Gd/Pr co-doped ceria electrolytes exhibiting mixed Pr3+/Pr4+ cations
作者： L. Spiridigliozzi , G. Dell'Agli , G. Accardo , S.P. Yoon , D. Frattini
DOI: 10.1016/J.CERAMINT.2018.11.144
关键词:
摘要: Abstract Gd0.2-xPrxCe0.8O1.90, (x = 0, 0.02, 0.04, 0.06, 0.08, 0.10) has been synthesized by means of a simple co-precipitation route based on ammonium carbonate as the precipitating agent. The as-synthesized precursors are cerium-gadolinium-praseodymium amorphous hydroxycarbonates, which nanometric in size with highly homogeneous morphology, leading to reactive doped and co-doped nanocrystalline (≈13 nm) ceria after mild thermal treatment (2 h at 600 °C). obtained results highlight very positive effect Pr powders’ sintering behaviour, favour better densification final pellets, thus improving both their microstructure (with relative densities 97–99% 1250 °C for 3 h) electrochemical properties (up 1.25·10–1 S cm−1 800 °C sample 6Pr) compared state-of-art ceria-based electrolytes. Through comprehensive characterization, relation was formed between content microstructural features sintered pellets electrical behaviour. amount doping investigated over wide range 6 mol% established be optimal (possessing lowest electronic conductivity contribution). Definitely, these indicate that Gd0.2-xPrxCe0.8O1.90 an excellent set characteristics, electrical, convenient fabrication process, making it perfectly suitable IT-SOFC practical applications.
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