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PVA-assisted synthesis and characterization of nano-crystalline La3+ and Mg2+ co-doped CeO2 electrolyte for intermediate-temperature solid oxide fuel cells |
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| Authors: | Chengcheng Wang Linghong Luo Yefan Wu Yingchao Dong Yonghong Chen Jijun Shi Liang Cheng Bin Lin |
| Institution: | 1. National Engineering Research Center for Domestic & Building Ceramics, Jingdezhen Ceramic Institute, Jingdezhen, Jiang Xi, 333001, People’s Republic of China 2. Materials and Surface Science Institute (MSSI), University of Limerick (UL), Limerick, Ireland 3. Anhui Key Laboratory of Low Temperature Co-fired Materials, Department of Chemistry, Huainan Normal University, Huainan, Anhui, 232001, People’s Republic of China |
| Abstract: | A series of nano-crystalline ceria-based solid solution electrolyte, Ce0.8La0.2?x MgxO2?δ (x?=?0.0, 0.05, 0.10, 0.15, and 0.2), were synthesized via the polyvinyl alcohol (PVA) assisted combustion method, and then characterized to the crystalline structure, powder morphology, sintering micro-structure, and electrical properties. Present study showed that Ce0.8La0.2?x Mg x O2?δ was exceedingly stable as a cubic phase in all temperature range and exhibited fine crystals ranging from 15 to 20 nm. After sintering at 1,400 °C, the as-prepared pellets exhibited a dense micro-structure with 96 % of theoretical density. The electrical conductivity was studied using AC impedance spectroscopy and it was observed that the composition Ce0.8La0.1?Mg0.1O2?δ showed higher electrical conductivity of 0.020 S?cm?1 at 700 °C. The thermal expansion was measured using dilatometer technique in the temperature range 30–1,000 °C. The average thermal expansion coefficient of Ce0.8La0.1?Mg0.1O2?δ was 12.37?×?10?6 K?1, which was higher than that of the commonly used SOFC electrolyte YSZ (~10.8?×?10?6 K?1). |
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