Visualizing the structural evolution of LSM/xYSZ composite cathodes for SOFC by in-situ neutron diffraction

Yan Chen; Ling Yang; Fei Ren; Ke An

doi:10.1038/srep05179

Visualizing the structural evolution of LSM/xYSZ composite cathodes for SOFC by in-situ neutron diffraction

Yan Chen, Ling Yang, Fei Ren, Ke An

Materials Engineering

Research output: Contribution to journal › Article › peer-review

37 Scopus citations

Abstract

Thermal stability of composite cathodes for solid oxide fuel cells, the mixtures of (La_0.8Sr_0.2)_0.95MnO _32-δ (LSM) and (Y₂O₃) x(ZrO₂)_1-x (xYSZ, x = 3, 6, 8 and 10), is determined using in-situ neutron diffraction. Thanks to the most advanced high flux neutron source, our work highlights the visualization of the phase evolutions in heterogeneous material systems at high temperatures, along with the analysis of the diffusion activities of transition metal ions that reveal the reaction mechanism and kinetics. It is found that the tetragonal-to-cubic phase transition in YSZ at T &gt'C leads to a heterogeneous redistribution of Mnions. The subsequent reaction of LSM and YSZ occurring at T > 1100°C is revealed as a three-stage kinetic process, yielding La₂Zr ₂O₇, SrZrO₃ and MnO. The diffusion activities of Y, Mn and La ions in the heterogeneous systems at elevated temperatures are derived by the structural analysis, and the three-stage reaction of YSZ and LSM is found strongly correlated to ions' behaviors as functions of temperature.

Original language	English
Article number	5179
Journal	Scientific Reports
Volume	4
DOIs	https://doi.org/10.1038/srep05179
State	Published - Jun 5 2014

Funding

This work was supported by the U.S. Department of Energy (DOE), Office of Basic Energy Sciences, Division of Materials Sciences and Engineering. Neutron scattering was carried out at the Spallation Neutron Source, DOE user facilities at Oak Ridge National Laboratory, which is sponsored by the Scientific User Facilities Division, Office of Basic Energy Sciences, U.S. Department of Energy. The authors thank Dr. J. Kiggans for help on the sample preparation and Dr. L. Cai, Mrs. R. A. Mills, Mr. D.P. Armitage and Mr. H.D. Skorpenske from SNS for their technical support of the neutron experiments. The authors thank Mrs. Gumin Zhu for the technical support.

Funders	Funder number
Office of Basic Energy Sciences
Scientific User Facilities Division
U.S. Department of Energy
Division of Materials Sciences and Engineering

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@article{400741dbe99a480daace243025fee093,

title = "Visualizing the structural evolution of LSM/xYSZ composite cathodes for SOFC by in-situ neutron diffraction",

abstract = "Thermal stability of composite cathodes for solid oxide fuel cells, the mixtures of (La0.8Sr0.2)0.95MnO 32-δ (LSM) and (Y2O3) x(ZrO2)1-x (xYSZ, x = 3, 6, 8 and 10), is determined using in-situ neutron diffraction. Thanks to the most advanced high flux neutron source, our work highlights the visualization of the phase evolutions in heterogeneous material systems at high temperatures, along with the analysis of the diffusion activities of transition metal ions that reveal the reaction mechanism and kinetics. It is found that the tetragonal-to-cubic phase transition in YSZ at T &gt'C leads to a heterogeneous redistribution of Mnions. The subsequent reaction of LSM and YSZ occurring at T > 1100°C is revealed as a three-stage kinetic process, yielding La2Zr 2O7, SrZrO3 and MnO. The diffusion activities of Y, Mn and La ions in the heterogeneous systems at elevated temperatures are derived by the structural analysis, and the three-stage reaction of YSZ and LSM is found strongly correlated to ions' behaviors as functions of temperature.",

author = "Yan Chen and Ling Yang and Fei Ren and Ke An",

year = "2014",

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doi = "10.1038/srep05179",

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volume = "4",

journal = "Scientific Reports",

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T1 - Visualizing the structural evolution of LSM/xYSZ composite cathodes for SOFC by in-situ neutron diffraction

AU - Chen, Yan

AU - Yang, Ling

AU - Ren, Fei

AU - An, Ke

PY - 2014/6/5

Y1 - 2014/6/5

N2 - Thermal stability of composite cathodes for solid oxide fuel cells, the mixtures of (La0.8Sr0.2)0.95MnO 32-δ (LSM) and (Y2O3) x(ZrO2)1-x (xYSZ, x = 3, 6, 8 and 10), is determined using in-situ neutron diffraction. Thanks to the most advanced high flux neutron source, our work highlights the visualization of the phase evolutions in heterogeneous material systems at high temperatures, along with the analysis of the diffusion activities of transition metal ions that reveal the reaction mechanism and kinetics. It is found that the tetragonal-to-cubic phase transition in YSZ at T &gt'C leads to a heterogeneous redistribution of Mnions. The subsequent reaction of LSM and YSZ occurring at T > 1100°C is revealed as a three-stage kinetic process, yielding La2Zr 2O7, SrZrO3 and MnO. The diffusion activities of Y, Mn and La ions in the heterogeneous systems at elevated temperatures are derived by the structural analysis, and the three-stage reaction of YSZ and LSM is found strongly correlated to ions' behaviors as functions of temperature.

AB - Thermal stability of composite cathodes for solid oxide fuel cells, the mixtures of (La0.8Sr0.2)0.95MnO 32-δ (LSM) and (Y2O3) x(ZrO2)1-x (xYSZ, x = 3, 6, 8 and 10), is determined using in-situ neutron diffraction. Thanks to the most advanced high flux neutron source, our work highlights the visualization of the phase evolutions in heterogeneous material systems at high temperatures, along with the analysis of the diffusion activities of transition metal ions that reveal the reaction mechanism and kinetics. It is found that the tetragonal-to-cubic phase transition in YSZ at T &gt'C leads to a heterogeneous redistribution of Mnions. The subsequent reaction of LSM and YSZ occurring at T > 1100°C is revealed as a three-stage kinetic process, yielding La2Zr 2O7, SrZrO3 and MnO. The diffusion activities of Y, Mn and La ions in the heterogeneous systems at elevated temperatures are derived by the structural analysis, and the three-stage reaction of YSZ and LSM is found strongly correlated to ions' behaviors as functions of temperature.

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JO - Scientific Reports

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Visualizing the structural evolution of LSM/xYSZ composite cathodes for SOFC by in-situ neutron diffraction

Abstract

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UN SDGs

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