CO2-tolerant Sr2CoTaO6-δ double perovskite oxide as a novel cathode for intermediate-temperature solid oxide fuel cell. (February 2022)

• Record Type: Journal Article
• Authors: Bu, Fanxing; Yang, Feiran; He, Yong; Wang, Mingchao; li, Yan; Zhou, Qingjun
• Is Part Of: Materials research bulletin. Volume 146(2022)
• Publication Date: 2022-02
• Subjects: Solid oxide fuel cells -- Co2-tolerant -- Double perovskite -- Cathode; Materials -- Periodicals; Crystal growth -- Periodicals; Matériaux -- Périodiques; Cristaux -- Croissance -- Périodiques; Crystal growth; Materials; Periodicals; 620.11
• DOI: 10.1016/j.materresbull.2021.111624
• Languages: English
• ISSNs: 0025-5408

Abstract

Highlights: A novel double perovskite oxide SCT is studied as IT-SOFC cathode. SCT is stable in air and pure CO2 at high temperatures. TECs of the SCT is 15.0 × 10 –6 K –1 at 30–1000 °C. SCT cathode displays high catalytic activity. Abstract: Sr2 CoTaO6-δ (SCT) double perovskite oxide was synthesized as potential cathode for intermediate temperature solid oxide fuel cells (IT-SOFCs). We systematically characterize its phase structure, thermal stability, thermal expansion, electrical conductivity, and electrochemical performance. The SCT exhibits superior phase stability and high CO2 -tolerant properties at high temperatures. The electrical conductivity of SCT is semiconductor-like and achieves its maximum value of 7 S cm -1 at 800 °C. The average thermal expansion coefficient of SCT in air is 15.0 × 10 –6 K -1 in a temperature range of 30–1000 °C. The area specific resistance of SCT cathode on Gd0.1 Ce0.9 O1.95 (GDC) electrolyte is 0.029 Ω cm 2 at 800 °C. An electrolyte-supported single cell with a thick-film GDC electrolyte (300 µm) reaches a maximum peak power density of 448 mW/cm 2 at 800 °C. With high phase stability and superior electrocatalytic activity indicate that SCT is a potential novel cathode material for IT-SOFCs. Graphical abstract: Image, graphical abstract