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Title: Overcoming phase instability of RBaCo2O5+ (R = Y and Ho) by Sr substitution for application as cathodes in solid oxide fuel cells

Abstract

Phase instabilities of the RBaCo2O5+ (R = Y and Ho) layered-perovskites and their decompositions into RCoO3 and BaCoO3-z at 800 oC in air were investigated. This will restrict their high temperature applications such as cathodes in solid oxide fuel cell (SOFC). However, appropriate amount of Sr substitution ( 60 % for R = Y and 70 % for R = Ho) for Ba successfully stabilized the R(Ba1-xSrx)Co2O5+ phase at elevated temperatures. This can be explained by decreasing oxygen vacancies at R-O layer, decreasing R-O bonding length, and consequent improvement of structural integrity. In addition, the Sr substitution (x = 0.6 - 1.0) for Ba provided added benefit with respect to the chemical stability against Ce0.8Gd0.2O1.9 (GDC) electrolyte, which is a critical requirement for the cathodes in SOFC. Among the various compositions investigated, the Y(Ba0.3Sr0.7)Co2O5+ + GDC composite cathode delivered the optimum electrochemical performances with a stable phase demonstrating the potential as a cathode in SOFC.

Authors:
 [1];  [2];  [1];  [2];  [1];  [1]
  1. ORNL
  2. University of Texas at Austin
Publication Date:
Research Org.:
Center for Nanophase Materials Sciences; Shared Research Equipment Collaborative Research Center; Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Spallation Neutron Source (SNS)
Sponsoring Org.:
USDOE Laboratory Directed Research and Development (LDRD) Program
OSTI Identifier:
1095139
DOE Contract Number:  
DE-AC05-00OR22725
Resource Type:
Journal Article
Journal Name:
Solid State Ionics
Additional Journal Information:
Journal Volume: 253; Journal ID: ISSN 0167-2738
Country of Publication:
United States
Language:
English
Subject:
Solid oxide fuel cells; layered perovskite cathode; phase decomposition; YBaCo2O5+; HoBaCo2O5+

Citation Formats

Kim, Jung-Hyun, Young Nam, Kim, Bi, Zhonghe, Manthiram, Arumugam, Paranthaman, Mariappan Parans, and Huq, Ashfia. Overcoming phase instability of RBaCo2O5+ (R = Y and Ho) by Sr substitution for application as cathodes in solid oxide fuel cells. United States: N. p., 2013. Web. doi:10.1016/j.ssi.2013.09.001.
Kim, Jung-Hyun, Young Nam, Kim, Bi, Zhonghe, Manthiram, Arumugam, Paranthaman, Mariappan Parans, & Huq, Ashfia. Overcoming phase instability of RBaCo2O5+ (R = Y and Ho) by Sr substitution for application as cathodes in solid oxide fuel cells. United States. https://doi.org/10.1016/j.ssi.2013.09.001
Kim, Jung-Hyun, Young Nam, Kim, Bi, Zhonghe, Manthiram, Arumugam, Paranthaman, Mariappan Parans, and Huq, Ashfia. Tue . "Overcoming phase instability of RBaCo2O5+ (R = Y and Ho) by Sr substitution for application as cathodes in solid oxide fuel cells". United States. https://doi.org/10.1016/j.ssi.2013.09.001.
@article{osti_1095139,
title = {Overcoming phase instability of RBaCo2O5+ (R = Y and Ho) by Sr substitution for application as cathodes in solid oxide fuel cells},
author = {Kim, Jung-Hyun and Young Nam, Kim and Bi, Zhonghe and Manthiram, Arumugam and Paranthaman, Mariappan Parans and Huq, Ashfia},
abstractNote = {Phase instabilities of the RBaCo2O5+ (R = Y and Ho) layered-perovskites and their decompositions into RCoO3 and BaCoO3-z at 800 oC in air were investigated. This will restrict their high temperature applications such as cathodes in solid oxide fuel cell (SOFC). However, appropriate amount of Sr substitution ( 60 % for R = Y and 70 % for R = Ho) for Ba successfully stabilized the R(Ba1-xSrx)Co2O5+ phase at elevated temperatures. This can be explained by decreasing oxygen vacancies at R-O layer, decreasing R-O bonding length, and consequent improvement of structural integrity. In addition, the Sr substitution (x = 0.6 - 1.0) for Ba provided added benefit with respect to the chemical stability against Ce0.8Gd0.2O1.9 (GDC) electrolyte, which is a critical requirement for the cathodes in SOFC. Among the various compositions investigated, the Y(Ba0.3Sr0.7)Co2O5+ + GDC composite cathode delivered the optimum electrochemical performances with a stable phase demonstrating the potential as a cathode in SOFC.},
doi = {10.1016/j.ssi.2013.09.001},
url = {https://www.osti.gov/biblio/1095139}, journal = {Solid State Ionics},
issn = {0167-2738},
number = ,
volume = 253,
place = {United States},
year = {2013},
month = {1}
}