Oxygen surface exchange kinetics and stability of (La,Sr) 2 CoO 4±δ/La 1-xSr xMO 3-δ (M = Co and Fe) hetero-interfaces at intermediate temperatures
Abstract
Heterostructured oxide interfaces created by decorating Ruddlesden-Popper phases (A2BO4) or perovskites on perovskites have shown not only pronounced cation segregation at the interface and in the A2BO4 structure but also much enhanced kinetics for oxygen electrocatalysis at elevated temperatures. In this study, we report and compare the time-dependent surface exchange kinetics and stability of (La 0.5Sr 0.5) 2CoO 4 -decorated (LSC 214) La 0.6Sr 0.4Co 0.2Fe 0.8O 3-δ (LSCF 113) and La 0.8Sr 0.2CoO 3-δ (LSC 113) thin films. While LSC 214 decoration on LSC 113 greatly reduced the degradation in the surface exchange kinetics as a function of time relative to LSC 113, LSCF 113 with LSC 214 coverage showed comparable surface exchange kinetics and stability to LSCF 113. This difference can be explained by greater surface stability of LSCF 113 than LSC 113 under testing conditions, and that LSC 214 decoration on LSC 113 reduced the decomposition of LSC 113 to form secondary phases that impedes oxygen exchange kinetics, and thus resulted in enhanced stability. This hypothesis is supported by the observations that annealing at 550 °C led to the formation of Sr-rich secondary particles on LSC 113 while no such particles were observed on LSCF 113. Densitymore »
- Authors:
-
- Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States). Electrochemical Energy Lab. and Dept. of Mechanical Engineering
- Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States). Electrochemical Energy Lab. and Dept. of Materials Science and Engineering
- Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States). Center for Nanophase Materials Sciences (CNMS)
- Univ. of Wisconsin, Madison, WI (United States). Dept. of Materials Science and Engineering
- Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States). Electrochemical Energy Lab., Dept. of Mechanical Engineering, and Dept. of Materials Science and Engineering
- Publication Date:
- Research Org.:
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Center for Nanophase Materials Sciences (CNMS)
- Sponsoring Org.:
- USDOE Office of Science (SC)
- OSTI Identifier:
- 1185681
- Grant/Contract Number:
- AC05-00OR22725
- Resource Type:
- Journal Article: Accepted Manuscript
- Journal Name:
- Journal of Materials Chemistry. A
- Additional Journal Information:
- Journal Volume: 3; Journal Issue: 5; Journal ID: ISSN 2050-7488
- Publisher:
- Royal Society of Chemistry
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 36 MATERIALS SCIENCE; LSCO fuel cell anode XPS
Citation Formats
Lee, Dongkyu, Lee, Yueh-Lin, Hong, Wesley T., Biegalski, Michael D., Morgan, Dane, and Shao-Horn, Yang. Oxygen surface exchange kinetics and stability of (La,Sr)2 CoO4±δ/La 1-xSrxMO3-δ (M = Co and Fe) hetero-interfaces at intermediate temperatures. United States: N. p., 2014.
Web. doi:10.1039/C4TA05795C.
Lee, Dongkyu, Lee, Yueh-Lin, Hong, Wesley T., Biegalski, Michael D., Morgan, Dane, & Shao-Horn, Yang. Oxygen surface exchange kinetics and stability of (La,Sr)2 CoO4±δ/La 1-xSrxMO3-δ (M = Co and Fe) hetero-interfaces at intermediate temperatures. United States. https://doi.org/10.1039/C4TA05795C
Lee, Dongkyu, Lee, Yueh-Lin, Hong, Wesley T., Biegalski, Michael D., Morgan, Dane, and Shao-Horn, Yang. Thu .
"Oxygen surface exchange kinetics and stability of (La,Sr)2 CoO4±δ/La 1-xSrxMO3-δ (M = Co and Fe) hetero-interfaces at intermediate temperatures". United States. https://doi.org/10.1039/C4TA05795C. https://www.osti.gov/servlets/purl/1185681.
@article{osti_1185681,
title = {Oxygen surface exchange kinetics and stability of (La,Sr)2 CoO4±δ/La 1-xSrxMO3-δ (M = Co and Fe) hetero-interfaces at intermediate temperatures},
author = {Lee, Dongkyu and Lee, Yueh-Lin and Hong, Wesley T. and Biegalski, Michael D. and Morgan, Dane and Shao-Horn, Yang},
abstractNote = {Heterostructured oxide interfaces created by decorating Ruddlesden-Popper phases (A2BO4) or perovskites on perovskites have shown not only pronounced cation segregation at the interface and in the A2BO4 structure but also much enhanced kinetics for oxygen electrocatalysis at elevated temperatures. In this study, we report and compare the time-dependent surface exchange kinetics and stability of (La0.5Sr0.5)2CoO4 -decorated (LSC214) La0.6Sr0.4Co0.2Fe0.8O3-δ (LSCF113) and La0.8Sr0.2CoO3-δ (LSC113) thin films. While LSC214 decoration on LSC113 greatly reduced the degradation in the surface exchange kinetics as a function of time relative to LSC113, LSCF113 with LSC214 coverage showed comparable surface exchange kinetics and stability to LSCF113. This difference can be explained by greater surface stability of LSCF113 than LSC113 under testing conditions, and that LSC214 decoration on LSC113 reduced the decomposition of LSC113 to form secondary phases that impedes oxygen exchange kinetics, and thus resulted in enhanced stability. This hypothesis is supported by the observations that annealing at 550 °C led to the formation of Sr-rich secondary particles on LSC113 while no such particles were observed on LSCF113. Density functional theory (DFT) computation provides further support, which revealed greater capacity of surface Sr segregation for LSCF113 having SrO termination than LSC113 having (La0.25Sr0.75)O termination for the experimental conditions, and lower energy gain to move Sr from LSCF113 into LSC214 relative to the LSC214-LSC113 system.},
doi = {10.1039/C4TA05795C},
url = {https://www.osti.gov/biblio/1185681},
journal = {Journal of Materials Chemistry. A},
issn = {2050-7488},
number = 5,
volume = 3,
place = {United States},
year = {2014},
month = {11}
}
Web of Science
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