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

Abstract

The present work reports a systematic study on the structural, thermal, electrical and electrochemical stability of SrCo1–xNbxO2.5+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 SrCoO2.5 is formed.

Authors:
 [1];  [2];  [1];  [1];  [1];  [1];  [1]
  1. Univ. of South Carolina, Columbia, SC (United States)
  2. Univ. of South Carolina, Columbia, SC (United States); Yangtze Univ., Hubei (People's Republic of China)
Publication Date:
Research Org.:
Univ. of South Carolina, Columbia, SC (United States)
Sponsoring Org.:
USDOE Advanced Research Projects Agency - Energy (ARPA-E)
OSTI Identifier:
1437306
Grant/Contract Number:  
AR0000492
Resource Type:
Accepted Manuscript
Journal Name:
Journal of the Electrochemical Society
Additional Journal Information:
Journal Volume: 163; Journal Issue: 8; Journal ID: ISSN 0013-4651
Publisher:
The Electrochemical Society
Country of Publication:
United States
Language:
English
Subject:
25 ENERGY STORAGE; brownmillerite; cathode; perovskite; solid oxide fuel cell; stability

Citation Formats

Wang, Jie, Jiang, Long, Xiong, Xiaolei, Zhang, Cuijuan, Jin, Xinfang, Lei, Libin, and Huang, Kevin. A Broad Stability Investigation of Nb-Doped SrCoO2.5+δ as a Reversible Oxygen Electrode for Intermediate-Temperature Solid Oxide Fuel Cells. United States: N. p., 2016. Web. https://doi.org/10.1149/2.1121608jes.
Wang, Jie, Jiang, Long, Xiong, Xiaolei, Zhang, Cuijuan, Jin, Xinfang, Lei, Libin, & Huang, Kevin. A Broad Stability Investigation of Nb-Doped SrCoO2.5+δ as a Reversible Oxygen Electrode for Intermediate-Temperature Solid Oxide Fuel Cells. United States. https://doi.org/10.1149/2.1121608jes
Wang, Jie, Jiang, Long, Xiong, Xiaolei, Zhang, Cuijuan, Jin, Xinfang, Lei, Libin, and Huang, Kevin. Fri . "A Broad Stability Investigation of Nb-Doped SrCoO2.5+δ as a Reversible Oxygen Electrode for Intermediate-Temperature Solid Oxide Fuel Cells". United States. https://doi.org/10.1149/2.1121608jes. https://www.osti.gov/servlets/purl/1437306.
@article{osti_1437306,
title = {A Broad Stability Investigation of Nb-Doped SrCoO2.5+δ as a Reversible Oxygen Electrode for Intermediate-Temperature Solid Oxide Fuel Cells},
author = {Wang, Jie and Jiang, Long and Xiong, Xiaolei and Zhang, Cuijuan and Jin, Xinfang and Lei, Libin and Huang, Kevin},
abstractNote = {The present work reports a systematic study on the structural, thermal, electrical and electrochemical stability of SrCo1–xNbxO2.5+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 SrCoO2.5 is formed.},
doi = {10.1149/2.1121608jes},
journal = {Journal of the Electrochemical Society},
number = 8,
volume = 163,
place = {United States},
year = {2016},
month = {6}
}

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Cited by: 14 works
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    Works referencing / citing this record:

    Sol-gel synthesis of cubic Nb/Ta-doped SrCoO 3− δ with mixed nano-micro morphology
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