A Broad Stability Investigation of Nb-Doped SrCoO2.5+δ as a Reversible Oxygen Electrode for Intermediate-Temperature Solid Oxide Fuel Cells

Wang, Jie; Jiang, Long; Xiong, Xiaolei; Zhang, Cuijuan; Jin, Xinfang; Lei, Libin; Huang, Kevin

doi:10.1149/2.1121608jes

Title: A Broad Stability Investigation of Nb-Doped SrCoO_2.5+δ as a Reversible Oxygen Electrode for Intermediate-Temperature Solid Oxide Fuel Cells

Journal Article · Fri Jun 10 00:00:00 EDT 2016 · Journal of the Electrochemical Society

DOI:https://doi.org/10.1149/2.1121608jes· OSTI ID:1437306

Wang, Jie ^[1]; Jiang, Long ^[2]; Xiong, Xiaolei ^[1]; Zhang, Cuijuan ^[1]; Jin, Xinfang ^[1]; Lei, Libin ^[1]; Huang, Kevin ^[1]

Univ. of South Carolina, Columbia, SC (United States)
Univ. of South Carolina, Columbia, SC (United States); Yangtze Univ., Hubei (People's Republic of China)

The present work reports a systematic study on the structural, thermal, electrical and electrochemical stability of SrCo_1–xNb_xO_2.5+δ series as a potential reversible oxygen-electrode for intermediate-temperature solid oxide fuel cells. The identified best composition is x = 0.10, which exhibits a stable pseudo primitive cubic structure at <700°C and a reversible oxygen redox reaction at 350°C. The conductivity of this material is p-type and also exhibits a peak at 350°C, implying that the electron hole conduction is closely associated with the oxygen nonstoichiometry. Electrochemical impedance spectroscopy analysis indicates a low polarization resistance rate-limited by a slower surface O₂ dissociation step. Altogether, the material is thermally stable and oxygen redox reversible below 700°C, above which a catalytically less active brownmillerite SrCoO_2.5 is formed.

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Research Organization:: Univ. of South Carolina, Columbia, SC (United States)

Sponsoring Organization:: USDOE Advanced Research Projects Agency - Energy (ARPA-E)

Grant/Contract Number:: AR0000492

OSTI ID:: 1437306

Journal Information:: Journal of the Electrochemical Society, Vol. 163, Issue 8; ISSN 0013-4651

Publisher:: The Electrochemical SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 35 works

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Sol-gel synthesis of cubic Nb/Ta-doped SrCoO _{3− δ} with mixed nano-micro morphology Fuertes, V. C.; Eroles, F. M.; Menzaque, A. D. Materials Research Express, Vol. 6, Issue 8 https://doi.org/10.1088/2053-1591/ab282d	journal	June 2019

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Title: A Broad Stability Investigation of Nb-Doped SrCoO_2.5+δ as a Reversible Oxygen Electrode for Intermediate-Temperature Solid Oxide Fuel Cells