Journal
CERAMICS INTERNATIONAL
Volume 45, Issue 7, Pages 9348-9358Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.ceramint.2018.07.209
Keywords
Cobalt; Electrolyte; Lithium; Nanostructure; Sintering; Vegard's law
Categories
Funding
- KRF, the Korean Research Fellowship Program, through the National Research Foundation of Korea - Ministry of Science, ICT and Future Planning of Republic of Korea [2016H1D3A1908428]
- KETEP, the Korea Institute of Energy Technology Evaluation and Planning
- Ministry of Trade, Industry and Energy of the Republic of Korea [20153030040930]
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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.
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