Accardo, Grazia Frattini, Domenico Ham, Hyung Chul Yoon, Sung Pil 2024-01-19T20:03:47Z 2024-01-19T20:03:47Z 2021-09-02 2019-05 0272-8842 https://pubs.kist.re.kr/handle/201004/120052 To improve the microstructural and electrochemical properties of gadolinium-doped ceria (GDC) electrolytes, materials co-doped with 0.5-2 mol% of lithium and cobalt oxides were successfully prepared in a one-step sol gel combustion synthesis route. Vegard's slope theory was used to predict the dopant solubility and the sintering behaviour. The charge and size of the added dopant influence the atom flux near the grain boundary with a change in the lattice parameter. In fact, compared to traditional multi grinding steps, sol gel combustion facilitates molecular mixing of the precursors and substitution of the dopant cations into the fluorite structure, considerably reducing the sintering temperature. Adding precursors of lithium and cobalt, as dopant, increases the GDC densification and reduces its traditional sintering temperature down to 1000-1100 degrees C, with an improvement of electrochemical properties. Impedance analysis showed that the addition of 2 mol% of lithium or 0.5 mol% of cobalt enhances the conductivity with a consequent improvement of cell performances. High total conductivities of 1.26.10(-1) S cm(-1) and 8.72.10(-2) S cm(-1) at 800 degrees C were achieved after sintering at 1000 degrees C and 1100 degrees C for (2)LiGDC and (0.)(5)CoGDC, respectively. English ELSEVIER SCI LTD DOPED CERIA ELECTROLYTE ELECTRICAL-PROPERTIES SOLID ELECTROLYTES IONIC-CONDUCTIVITY IRON-OXIDE GRAIN-SIZE CO DENSIFICATION CERAMICS BEHAVIOR Direct addition of lithium and cobalt precursors to Ce0.8Gd0.2O1.95 electrolytes to improve microstructural and electrochemical properties in IT-SOFC at lower sintering temperature Article 10.1016/j.ceramint.2018.07.209 1 CERAMICS INTERNATIONAL, v.45, no.7, pp.9348 - 9358 CERAMICS INTERNATIONAL 45 7 9348 9358 scie scopus 000463688400003 2-s2.0-85050612059 Materials Science, Ceramics Materials Science Article DOPED CERIA ELECTROLYTE ELECTRICAL-PROPERTIES SOLID ELECTROLYTES IONIC-CONDUCTIVITY IRON-OXIDE GRAIN-SIZE CO DENSIFICATION CERAMICS BEHAVIOR Cobalt Electrolyte Lithium Nanostructure Sintering Vegard&apos s law