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Title: LSM/YSZ Button Cell Tests in Cathode Air with Measured Cr Concentrations

Abstract

A test fixture and methodology was developed for testing anode-supported SOFC button cells downstream from a chromia pellet at a prescribed temperature for qualitative control of Cr volatility. An alumina foam coated with Cr-gettering Na2CO3 was placed downstream from the cell to capture Cr species from the cathode air by reacting to form Na2CrO4. The coating and reaction product are both water soluble, facilitating dissolution from the porous substrate for subsequent ICP analysis to determine the Cr concentration in the resulting solution. The mass of collected Cr is used to calculate the average Cr concentration in the known volume of air used during the test. Cells with LSM/YSZ cathodes were electrochemically tested for 600 to 1000 hours with chromia pellets at varying conditions of temperature and humidity to elicit varying levels of Cr volatility. Molar Cr concentrations of only 40 to 170 ppt caused ~4%/kh degradation.

Authors:
; ; ;
Publication Date:
Research Org.:
Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1440637
Report Number(s):
PNNL-SA-125284
Journal ID: ISSN 1938-6737; AA6040000
DOE Contract Number:  
AC05-76RL01830
Resource Type:
Journal Article
Journal Name:
ECS Transactions (Online)
Additional Journal Information:
Journal Volume: 78; Journal Issue: 1; Journal ID: ISSN 1938-6737
Publisher:
Electrochemical Society
Country of Publication:
United States
Language:
English

Citation Formats

Hardy, John S., Coyle, Christopher A., Neeway, James J., and Stevenson, Jeffry W. LSM/YSZ Button Cell Tests in Cathode Air with Measured Cr Concentrations. United States: N. p., 2017. Web. doi:10.1149/07801.0943ecst.
Hardy, John S., Coyle, Christopher A., Neeway, James J., & Stevenson, Jeffry W. LSM/YSZ Button Cell Tests in Cathode Air with Measured Cr Concentrations. United States. https://doi.org/10.1149/07801.0943ecst
Hardy, John S., Coyle, Christopher A., Neeway, James J., and Stevenson, Jeffry W. Tue . "LSM/YSZ Button Cell Tests in Cathode Air with Measured Cr Concentrations". United States. https://doi.org/10.1149/07801.0943ecst.
@article{osti_1440637,
title = {LSM/YSZ Button Cell Tests in Cathode Air with Measured Cr Concentrations},
author = {Hardy, John S. and Coyle, Christopher A. and Neeway, James J. and Stevenson, Jeffry W.},
abstractNote = {A test fixture and methodology was developed for testing anode-supported SOFC button cells downstream from a chromia pellet at a prescribed temperature for qualitative control of Cr volatility. An alumina foam coated with Cr-gettering Na2CO3 was placed downstream from the cell to capture Cr species from the cathode air by reacting to form Na2CrO4. The coating and reaction product are both water soluble, facilitating dissolution from the porous substrate for subsequent ICP analysis to determine the Cr concentration in the resulting solution. The mass of collected Cr is used to calculate the average Cr concentration in the known volume of air used during the test. Cells with LSM/YSZ cathodes were electrochemically tested for 600 to 1000 hours with chromia pellets at varying conditions of temperature and humidity to elicit varying levels of Cr volatility. Molar Cr concentrations of only 40 to 170 ppt caused ~4%/kh degradation.},
doi = {10.1149/07801.0943ecst},
url = {https://www.osti.gov/biblio/1440637}, journal = {ECS Transactions (Online)},
issn = {1938-6737},
number = 1,
volume = 78,
place = {United States},
year = {2017},
month = {5}
}