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Title: Operando and In situ X-ray Spectroscopies of Degradation in La 0.6 Sr 0.4 Co 0.2 Fe 0.8 O 3-δ Thin Film Cathodes in Fuel Cells

Abstract

Information from ex situ characterization can fall short in describing complex materials systems simultaneously exposed to multiple external stimuli. Operando X-ray absorption spectroscopy (XAS) was used to probe the local atomistic and electronic structure of specific elements in a La 0.6Sr 0.4Co 0.2Fe 0.8O 3-δ (LSCF) thin film cathode exposed to air contaminated with H 2O and CO 2 under operating conditions. While impedance spectroscopy showed that the polarization resistance of the LSCF cathode increased upon exposure to both contaminants at 750°C, XAS near-edge and extended fine structure showed that the degree of oxidation for Fe and Co decreases with increasing temperature. Synchrotron-based X-ray photoelectron spectroscopy tracked the formation and removal of a carbonate species, a Co phase, and different oxygen moieties as functions of temperature and gas. The combined information provides insight into the fundamental mechanism by which H 2O and CO 2 cause degradation in the cathode of solid oxide fuel cells.

Authors:
; ; ; ;
Publication Date:
Research Org.:
Energy Frontier Research Centers (EFRC) (United States). Heterogeneous Functional Materials Center (HeteroFoaM)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1370161
DOE Contract Number:  
SC0001061
Resource Type:
Journal Article
Journal Name:
ChemSusChem
Additional Journal Information:
Journal Volume: 7; Journal Issue: 11; Related Information: HeteroFoaM partners with University of South Carolina (lead); University of California, Santa Barbara; University of Connecticut; Georgia Institute of Technology; Princeton University; Rochester Institute of Technology; Savannah River National Laboratory; University of South Carolina; University of Utah; Journal ID: ISSN 1864-5631
Publisher:
ChemPubSoc Europe
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY

Citation Formats

Lai, Samson Y., Ding, Dong, Liu, Mingfei, Liu, Meilin, and Alamgir, Faisal M. Operando and In situ X-ray Spectroscopies of Degradation in La 0.6 Sr 0.4 Co 0.2 Fe 0.8 O 3-δ Thin Film Cathodes in Fuel Cells. United States: N. p., 2014. Web. doi:10.1002/cssc.201402670.
Lai, Samson Y., Ding, Dong, Liu, Mingfei, Liu, Meilin, & Alamgir, Faisal M. Operando and In situ X-ray Spectroscopies of Degradation in La 0.6 Sr 0.4 Co 0.2 Fe 0.8 O 3-δ Thin Film Cathodes in Fuel Cells. United States. doi:10.1002/cssc.201402670.
Lai, Samson Y., Ding, Dong, Liu, Mingfei, Liu, Meilin, and Alamgir, Faisal M. Tue . "Operando and In situ X-ray Spectroscopies of Degradation in La 0.6 Sr 0.4 Co 0.2 Fe 0.8 O 3-δ Thin Film Cathodes in Fuel Cells". United States. doi:10.1002/cssc.201402670.
@article{osti_1370161,
title = {Operando and In situ X-ray Spectroscopies of Degradation in La 0.6 Sr 0.4 Co 0.2 Fe 0.8 O 3-δ Thin Film Cathodes in Fuel Cells},
author = {Lai, Samson Y. and Ding, Dong and Liu, Mingfei and Liu, Meilin and Alamgir, Faisal M.},
abstractNote = {Information from ex situ characterization can fall short in describing complex materials systems simultaneously exposed to multiple external stimuli. Operando X-ray absorption spectroscopy (XAS) was used to probe the local atomistic and electronic structure of specific elements in a La0.6Sr0.4Co0.2Fe0.8O3-δ (LSCF) thin film cathode exposed to air contaminated with H2O and CO2 under operating conditions. While impedance spectroscopy showed that the polarization resistance of the LSCF cathode increased upon exposure to both contaminants at 750°C, XAS near-edge and extended fine structure showed that the degree of oxidation for Fe and Co decreases with increasing temperature. Synchrotron-based X-ray photoelectron spectroscopy tracked the formation and removal of a carbonate species, a Co phase, and different oxygen moieties as functions of temperature and gas. The combined information provides insight into the fundamental mechanism by which H2O and CO2 cause degradation in the cathode of solid oxide fuel cells.},
doi = {10.1002/cssc.201402670},
journal = {ChemSusChem},
issn = {1864-5631},
number = 11,
volume = 7,
place = {United States},
year = {2014},
month = {9}
}

Works referenced in this record:

Enhanced Sulfur and Coking Tolerance of a Mixed Ion Conductor for SOFCs: BaZr0.1Ce0.7Y0.2–xYbxO3–δ
journal, October 2009