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Title: High stability SrTi1-xFexO3-δ electrodes for oxygen reduction and oxygen evolution reactions

Abstract

We report that Sr(Ti1-xFex)O3-δ (STF) has recently been explored as an oxygen electrode for solid oxide electrochemical cells (SOCs). Model thin film electrode studies show oxygen surface exchange rates that generally improve with increasing Fe content when x < 0.5, and are comparable to the best Co-containing perovskite electrode materials. Recent results on porous electrodes with the specific composition Sr(Ti0.3Fe0.7)O3-δ show excellent electrode performance and stability, but other compositions have not been tested. Here we report results for porous electrodes with a range of compositions from x = 0.5 to 0.9. The polarization resistance decreases with increasing Fe content up to x = 0.7, but increases for further increases in x. This results from the interaction of two effects – the oxygen solid state diffusion coefficient increases with increasing x, but the electrode surface area and surface oxygen exchange rate decrease due to increased sinterability and Sr surface segregation for the Fe-rich compositions. Symmetric cells showed no degradation during 1000 h life tests at 700 °C even at a current density of 1.5 A cm-2, showing that all the STF electrode compositions worked stably in both fuel cell mode and electrolysis modes. Lastly, the excellent stability may be explained bymore » X-ray Photoelectron Spectroscopy (XPS) results showing that the amount of surface segregated Sr did not change during the long-term testing, and by relatively low polarization resistances that help avoid electrode delamination.« less

Authors:
ORCiD logo [1]; ORCiD logo [2];  [3]; ORCiD logo [2];  [3];  [3]; ORCiD logo [2]
  1. Northwestern Univ., Evanston, IL (United States); Xi'an Jiaotong Univ., Shaanxi (China)
  2. Northwestern Univ., Evanston, IL (United States)
  3. Xi'an Jiaotong Univ., Shaanxi (China)
Publication Date:
Research Org.:
Northwestern Univ., Evanston, IL (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Materials Sciences & Engineering Division; USDOE Office of Energy Efficiency and Renewable Energy (EERE), Transportation Office. Fuel Cell Technologies Office; National Science Foundation (NSF); China Scholarship Council; National Natural Science Foundation of China (NNSFC)
OSTI Identifier:
1599356
Alternate Identifier(s):
OSTI ID: 1560882; OSTI ID: 1658927
Grant/Contract Number:  
SC0016965; EE450008079; DMR-1506925; DMR-1545907; NNCI-1542205; DMR-1121262; 201606285002; 51602248
Resource Type:
Accepted Manuscript
Journal Name:
Journal of Materials Chemistry. A
Additional Journal Information:
Journal Volume: 7; Journal Issue: 37; Journal ID: ISSN 2050-7488
Publisher:
Royal Society of Chemistry
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY

Citation Formats

Zhang, Shan-Lin, Cox, Dalton, Yang, Hao, Park, Beom-Kyeong, Li, Cheng-Xin, Li, Chang-Jiu, and Barnett, Scott A. High stability SrTi1-xFexO3-δ electrodes for oxygen reduction and oxygen evolution reactions. United States: N. p., 2019. Web. https://doi.org/10.1039/c9ta07548h.
Zhang, Shan-Lin, Cox, Dalton, Yang, Hao, Park, Beom-Kyeong, Li, Cheng-Xin, Li, Chang-Jiu, & Barnett, Scott A. High stability SrTi1-xFexO3-δ electrodes for oxygen reduction and oxygen evolution reactions. United States. https://doi.org/10.1039/c9ta07548h
Zhang, Shan-Lin, Cox, Dalton, Yang, Hao, Park, Beom-Kyeong, Li, Cheng-Xin, Li, Chang-Jiu, and Barnett, Scott A. Tue . "High stability SrTi1-xFexO3-δ electrodes for oxygen reduction and oxygen evolution reactions". United States. https://doi.org/10.1039/c9ta07548h. https://www.osti.gov/servlets/purl/1599356.
@article{osti_1599356,
title = {High stability SrTi1-xFexO3-δ electrodes for oxygen reduction and oxygen evolution reactions},
author = {Zhang, Shan-Lin and Cox, Dalton and Yang, Hao and Park, Beom-Kyeong and Li, Cheng-Xin and Li, Chang-Jiu and Barnett, Scott A.},
abstractNote = {We report that Sr(Ti1-xFex)O3-δ (STF) has recently been explored as an oxygen electrode for solid oxide electrochemical cells (SOCs). Model thin film electrode studies show oxygen surface exchange rates that generally improve with increasing Fe content when x < 0.5, and are comparable to the best Co-containing perovskite electrode materials. Recent results on porous electrodes with the specific composition Sr(Ti0.3Fe0.7)O3-δ show excellent electrode performance and stability, but other compositions have not been tested. Here we report results for porous electrodes with a range of compositions from x = 0.5 to 0.9. The polarization resistance decreases with increasing Fe content up to x = 0.7, but increases for further increases in x. This results from the interaction of two effects – the oxygen solid state diffusion coefficient increases with increasing x, but the electrode surface area and surface oxygen exchange rate decrease due to increased sinterability and Sr surface segregation for the Fe-rich compositions. Symmetric cells showed no degradation during 1000 h life tests at 700 °C even at a current density of 1.5 A cm-2, showing that all the STF electrode compositions worked stably in both fuel cell mode and electrolysis modes. Lastly, the excellent stability may be explained by X-ray Photoelectron Spectroscopy (XPS) results showing that the amount of surface segregated Sr did not change during the long-term testing, and by relatively low polarization resistances that help avoid electrode delamination.},
doi = {10.1039/c9ta07548h},
journal = {Journal of Materials Chemistry. A},
number = 37,
volume = 7,
place = {United States},
year = {2019},
month = {9}
}

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