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Properties of Ce0.85Sm0.15O2-δ-CuO electrolytes for intermediate-temperature solid oxide fuel cells
Solid State Ionics ( IF 3.2 ) Pub Date : 2020-05-25 , DOI: 10.1016/j.ssi.2020.115331
Ning Tian , Yanmei Qu , Haijiao Men , Ji Yu , Xiaoyan Wang , Jie Zheng

To improve the ionic conductivity of the common electrolyte Sm-doped CeO2 (SDC) for intermediate-temperature solid oxide fuel cells (IT-SOFCs) and to facilitate its production, we synthesized electrolyte materials SDC(Ce0.85Sm0.15O2-δ)-x mol %CuO (x = 0, 0.5, 1, 2) (named SDC, SDC + 0.5CuO, SDC + 1CuO, and SDC + 2CuO). The structural properties, surface micro-morphologies, and electrical properties of these four electrolyte materials were studied, as well as the performances of corresponding SOFCs. The results showed that all the materials had highly-crystalline CeO2 cubic fluorite structures and highly-dense ceramic electrolyte sheets. Adding an appropriate amount of CuO significantly reduced the grain-boundary resistance of SDC and improved its ionic conductivity. The SDC + 0.5CuO electrolyte showed the best ionic conductivity (σt = 0.088 Scm−1 at 800 °C), and the SOFC based on SDC + 0.5CuO had the highest output power, reaching a maximum power density of 380 mWcm−2 at 800 °C. In addition, the SOFC based on SDC + 0.5CuO exhibited good stability. The above results show that the optimal CuO amount was 0.5 mol% in our case, and SDC-CuO materials are promising candidates for use as electrolytes in IT-SOFCs.



中文翻译:

用于中温固体氧化物燃料电池的Ce 0.85 Sm 0.15 O2 -δ- CuO电解质的性能

为了提高用于中温固体氧化物燃料电池(IT-SOFC)的普通电解质Sm掺杂CeO 2(SDC)的离子电导率并促进其生产,我们合成了电解质材料SDC(Ce 0.85 Sm 0.15 O2 )-x mol%CuO(x = 0、0.5、1、2)(命名为SDC,SDC + 0.5CuO,SDC + 1CuO和SDC + 2CuO)。研究了这四种电解质材料的结构性能,表面微观形貌和电性能,以及相应的SOFC的性能。结果表明,所有材料均具有高结晶度的CeO 2。立方萤石结构和高密度陶瓷电解质片。添加适量的CuO会显着降低SDC的晶界电阻并改善其离子电导率。所述SDC + 0.5CuO电解质显示出最好的离子电导率(σ = 0.088 SCM -1根据SDC + 0.5CuO在800℃下),并且SOFC具有最高的输出功率,达到380 mWcm的最大功率密度-2在800°C下。此外,基于SDC + 0.5CuO的SOFC表现出良好的稳定性。以上结果表明,在我们的情况下,最佳的CuO含量为0.5 mol%,SDC-CuO材料有望用作IT-SOFC中的电解质。

更新日期:2020-05-25
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