Enhanced redox-stable Sm0.5Sr0.5FeO3-δ electrode material for symmetric solid oxide fuel cells at reduced temperatures. Issue 5 (1st April 2020)

• Record Type: Journal Article
• Authors: Wu, Yujie; Yang, Yang; Zhou, Shijie; Zhu, Wenwu; Song, Wenchao; Bao, Hang; Chen, Hui; Ou, Xuemei; Khan, Majid; Ling, Yihan
• Is Part Of: Ceramics international. Volume 46:Issue 5(2020)
• Page Start: 6714
• Page End: 6722
• Publication Date: 2020-04-01
• Subjects: Symmetric solid oxide fuel cells -- Sm0.5Sr0.5FeO3-δ -- Reduced temperature -- Electrode polarization resistance; Ceramics -- Periodicals; Céramique industrielle -- Périodiques; Ceramics; Periodicals; Electronic journals; 666
• DOI: 10.1016/j.ceramint.2019.11.160
• Languages: English
• ISSNs: 0272-8842

Abstract

Abstract: A redox-stable perovskite oxide Sm0.5 Sr0.5 FeO3-δ (SSF) at reduced temperatures is investigated as a new promising electrode material for symmetric solid oxide fuel cells (SSOFCs). SSF exhibits well structural stability and catalytic activity in redox atmosphere at intermediate temperatures (≤750 °C), and the electrical conductivity exhibits a semiconductor behavior both in cathode and anode atmosphere. To enhance the electrochemical performance of SSF by adding oxygen-ion conductor Gd0.1 Ce0.9 O2-δ (GDC), the electrode polarization resistances at 750 °C are reduced from 2.86 to 0.67 Ω cm 2 in air and from 4.32 to 0.91 Ω cm 2 in humidified H2, respectively. Accordingly, the cell performance of SSOFCs with SSF-GDC composite electrode is almost twice (201.74 mW cm −2 at 750 °C) of those with the single-phase one. There preliminary experimental results demonstrate SSF-based electrode materials can be new promising candidates for SSOFCs at low temperatures.