Thermal and Electrical Stability of Sr _0.9Y_0.1CoO_2.5+δ as a Promising Cathode for Intermediate-Temperature Solid Oxide Fuel Cells

Journal Article · 20 January 2016 · Journal of the Electrochemical Society

DOI: https://doi.org/10.1149/2.0361605jes · OSTI ID:1437588

Jiang, Long ^[1]; Wang, Jie ^[2]; Xiong, Xiaolei ^[2]; Jin, Xinfang ^[2]; Pei, Qiming ^[3]; Huang, Kevin ^[2]

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1. Yangtze Univ., Jingzhou, Hubei (China). Applied Physics and Information Technology Research Center; Univ. of South Carolina, Columbia, SC (United States). Dept. of Mechanical Engineering; University of South Carolina
2. Univ. of South Carolina, Columbia, SC (United States). Dept. of Mechanical Engineering
3. Yangtze Univ., Jingzhou, Hubei (China). Applied Physics and Information Technology Research Center; Univ. of South Carolina, Columbia, SC (United States). Dept. of Mechanical Engineering

Here, the present study reports thermal and electrical properties of Sr_1-xYxCoO_2.5+δ (x = 0–0.40) as a promising cathode for intermediatetemperature solid oxide fuel cells. The results show that x = 0.10 is the best composition possessing a single primitive cubic perovskite structure, stable conductivity and the lowest polarization resistance. Thermogravimetric analysis indicates an oxygen intake from RT to ~375°C, above which oxygen loss occurs. The oxygen gain-loss behavior corresponds well with the conductivity increase-decrease trending, reflecting that oxygen-nonstoichiometry controls the hole-concentration (or oxidation-state of Co-ions). Electrochemical impedance spectroscopy analysis further reveals that the overall ORR polarization consists of a faster charge-transfer and a slower surface oxygen exchange.

• Research Organization: Univ. of South Carolina, Columbia, SC (United States)
• Sponsoring Organization: USDOE Advanced Research Projects Agency - Energy (ARPA-E); Yangtze University
• Grant/Contract Number: AR0000492; FE0023317
• OSTI ID: 1437588
• Journal Information: Journal of the Electrochemical Society, Journal Name: Journal of the Electrochemical Society Journal Issue: 5 Vol. 163; ISSN 0013-4651
• Publisher: The Electrochemical SocietyCopyright Statement
• Country of Publication: United States
• Language: English