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Title: Fe-substituted SrTiO 3-δ-Ce 0.9Gd 0.1O 2 composite anodes for solid oxide fuel cells

Abstract

A new composite solid oxide fuel cell anode material, SrTi 1-xFe xO 3-δ mixed with Gd-doped ceria, was tested in La 0.9Sr 0.1Ga 0.8Mg 0.2O 3-δ electrolyte-supported cells with La 0.4Ce 0.6O 2 barrier layers and La 0.6Sr 0.4Fe 0.8Co 0.2O 3 cathodes. The x = 0.7 composition had an anode polarization resistance of 0.17 Ω cm 2, at 800 °C in humidified H 2, much lower than the value 0.39 Ω cm 2 measured for x = 0.4 and 3.14 Ω cm 2 for x = 0. The reduced polarization resistance correlated with increased oxygen non-stoichiometry δ, which suggests that it may be related to increased ionic conductivity. Electrochemical impedance spectroscopy (EIS) measurements at 800 °C on the x = 0.7 anode cell showed a main response centered at ~1 Hz that increased with decreasing hydrogen partial pressure. The maximum power density observed was for the x = 0.7 cell – 337 mW cm -2 at 800 °C in air and humidified hydrogen – and was limited mainly by the thick electrolyte.

Authors:
; ; ; ; ;  [1]
  1. NWU
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
Sponsoring Org.:
NSFDOE - BASIC ENERGY SCIENCES
OSTI Identifier:
1082522
Resource Type:
Journal Article
Journal Name:
Energy & Environmental Science
Additional Journal Information:
Journal Volume: 6; Journal Issue: 6; Journal ID: ISSN 1754-5692
Publisher:
Royal Society of Chemistry
Country of Publication:
United States
Language:
ENGLISH

Citation Formats

Cho, Sungmee, Fowler, Daniel E., Miller, Elizabeth C., Cronin, J. Scott, Poeppelmeier, Kenneth R., and Barnett, Scott A. Fe-substituted SrTiO3-δ-Ce0.9Gd0.1O2 composite anodes for solid oxide fuel cells. United States: N. p., 2013. Web. doi:10.1039/C3EE23791E.
Cho, Sungmee, Fowler, Daniel E., Miller, Elizabeth C., Cronin, J. Scott, Poeppelmeier, Kenneth R., & Barnett, Scott A. Fe-substituted SrTiO3-δ-Ce0.9Gd0.1O2 composite anodes for solid oxide fuel cells. United States. doi:10.1039/C3EE23791E.
Cho, Sungmee, Fowler, Daniel E., Miller, Elizabeth C., Cronin, J. Scott, Poeppelmeier, Kenneth R., and Barnett, Scott A. Wed . "Fe-substituted SrTiO3-δ-Ce0.9Gd0.1O2 composite anodes for solid oxide fuel cells". United States. doi:10.1039/C3EE23791E.
@article{osti_1082522,
title = {Fe-substituted SrTiO3-δ-Ce0.9Gd0.1O2 composite anodes for solid oxide fuel cells},
author = {Cho, Sungmee and Fowler, Daniel E. and Miller, Elizabeth C. and Cronin, J. Scott and Poeppelmeier, Kenneth R. and Barnett, Scott A.},
abstractNote = {A new composite solid oxide fuel cell anode material, SrTi1-xFexO3-δ mixed with Gd-doped ceria, was tested in La0.9Sr0.1Ga0.8Mg0.2O3-δ electrolyte-supported cells with La0.4Ce0.6O2 barrier layers and La0.6Sr0.4Fe0.8Co0.2O3 cathodes. The x = 0.7 composition had an anode polarization resistance of 0.17 Ω cm2, at 800 °C in humidified H2, much lower than the value 0.39 Ω cm2 measured for x = 0.4 and 3.14 Ω cm2 for x = 0. The reduced polarization resistance correlated with increased oxygen non-stoichiometry δ, which suggests that it may be related to increased ionic conductivity. Electrochemical impedance spectroscopy (EIS) measurements at 800 °C on the x = 0.7 anode cell showed a main response centered at ~1 Hz that increased with decreasing hydrogen partial pressure. The maximum power density observed was for the x = 0.7 cell – 337 mW cm-2 at 800 °C in air and humidified hydrogen – and was limited mainly by the thick electrolyte.},
doi = {10.1039/C3EE23791E},
journal = {Energy & Environmental Science},
issn = {1754-5692},
number = 6,
volume = 6,
place = {United States},
year = {2013},
month = {6}
}