Journal of Power Sources ( IF 8.1 ) Pub Date : 2023-12-13 , DOI: 10.1016/j.jpowsour.2023.233932
Shuting Li , Yuanyuan Liu , Changkun Cai , Ke Xue , Liuzhen Bian , Shengli An
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The development of cathode with high oxygen reduction reaction (ORR) activity is crucial for intermediate-temperature solid oxide fuel cells (IT-SOFCs). SrCoO3-δ oxides, a mixed ion-electron conductivity (MIEC), are promising cathode materials. However, pure SrCoO3-δ exhibits a hexagonal or rhombohedral structure with poor electrical properties, limiting its application in IT-SOFCs. In this work, high-valence Ce4+ is doped at the A-site of SrCoO3-δ perovskite to improve the phase structural stability and electrochemical activity of SrCoO3-δ. The findings reveal that Ce4+ doping in small amounts significantly advances the conductivity and ORR activity due to enhanced structural stability. Among the series of samples, Sr0.95Ce0.05Co3-δ (SCC005) presents the best electrochemical performance. Moreover, the addition of Ce0.8Gd0.2O2-δ (GDC) further reduces polarization resistance by about ∼7 times. The peak power density of 1.3 W cm−2 is obtained at 750 °C for the SCC05-30%GDC cathode. The results indicate that A-site Ce doping is a promising strategy to enhance the ORR activity of SrCoO3-δ oxides.
中文翻译:

Ce掺杂提高中温固体氧化物燃料电池SrCoO3-δ阴极的相稳定性和电化学性能
开发具有高氧还原反应(ORR)活性的阴极对于中温固体氧化物燃料电池(IT-SOFC)至关重要。 SrCoO 3-δ 氧化物具有混合离子电子电导率(MIEC),是有前途的阴极材料。然而,纯SrCoO 3-δ 呈现六方或菱形结构,电性能较差,限制了其在IT-SOFC中的应用。本工作通过在SrCoO 3-δ 钙钛矿的A位掺杂高价Ce 4+ 来提高SrCoO 3-δ 的相结构稳定性和电化学活性。研究结果表明,少量的 Ce 4+ 掺杂由于增强的结构稳定性而显着提高了电导率和 ORR 活性。在该系列样品中,Sr 0.95 Ce 0.05 Co 3-δ (SCC005)呈现出最好的电化学性能。此外,添加Ce 0.8 Gd 0.2 O 2-δ (GDC)进一步将极化电阻降低约~7倍。 SCC05-30%GDC 阴极在 750 °C 时获得 1.3 W cm −2 的峰值功率密度。结果表明,A 位 Ce 掺杂是增强 SrCoO 3-δ 氧化物 ORR 活性的一种有前景的策略。