Chromium Poisoning of La 1-x Sr x MnO 3±δ Cathodes and Electrochemical Validation of Chromium Getters in Intermediate Temperature-Solid Oxide Fuel Cells
Abstract
The effect of chromium poisoning on electrochemical performance degradation has been studied at intermediate temperatures (550-650 degrees C) using La 1-xSr xMnO 3±δ (LSM) cathode and an electrochemical cell configuration air/LSM//YSZ//Pt/air. A rapid increase in polarization resistance is observed in the presence of gaseous chromium species containing humid air (3% H 2O) at both 550 degrees C and 650 degrees C. Cross-sectional elemental mapping and high-resolution transmission electron microscopy of the LSM/YSZ interface show the presence of crystalline Cr 2O 3 and (Mn,Cr) 3O 4 phases indicating reduction of gaseous hexavalent-chromium species and deposition of solid reaction products. Subsequent experiments, performed under the above exposure conditions but in the presence of a chromium getter, showed stable polarization resistance. The electrochemical performance of half-cells in Cr-containing humid air atmosphere and in the presence of the chromium getter also remained stable during 100-h tests at 550 and 650 degrees C, respectively. The post-test structural and chemical analysis of the electrode, electrode-electrolyte interface and getter by scanning- transmission electron microscopy, energy dispersive X-ray and Raman spectroscopy showed that the cathode bulk and cathode- electrolyte interface remained free of chromium deposits whereas chromium species deposited near the air inlet region of the porous gettermore »
- Authors:
-
[2];
- Univ. of Connecticut, Storrs, CT (United States); National Renewable Energy Lab. (NREL), Golden, CO (United States)
- Univ. of Connecticut, Storrs, CT (United States)
- Publication Date:
- Research Org.:
- National Renewable Energy Lab. (NREL), Golden, CO (United States)
- Sponsoring Org.:
- USDOE Office of Energy Efficiency and Renewable Energy (EERE); USDOE Office of Fossil Energy (FE)
- OSTI Identifier:
- 1562978
- Alternate Identifier(s):
- OSTI ID: 1566053
- Report Number(s):
- NREL/JA-5K00-74917
Journal ID: ISSN 0013-4651
- Grant/Contract Number:
- AC36-08GO28308; FE-0023385; FE 0023385
- Resource Type:
- Published Article
- Journal Name:
- Journal of the Electrochemical Society
- Additional Journal Information:
- Journal Volume: 166; Journal Issue: 13; Journal ID: ISSN 0013-4651
- Publisher:
- The Electrochemical Society
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 30 DIRECT ENERGY CONVERSION; fuel cells; solid oxide fuel cells; chromium poisoning; poisoning mitigation; SOFC cathode
Citation Formats
Heo, Su Jeong, Hong, Junsung, Aphale, Ashish, Hu, Boxun, and Singh, Prabhakar. Chromium Poisoning of La 1-x Sr x MnO 3±δ Cathodes and Electrochemical Validation of Chromium Getters in Intermediate Temperature-Solid Oxide Fuel Cells. United States: N. p., 2019.
Web. doi:10.1149/2.0931913jes.
Heo, Su Jeong, Hong, Junsung, Aphale, Ashish, Hu, Boxun, & Singh, Prabhakar. Chromium Poisoning of La 1-x Sr x MnO 3±δ Cathodes and Electrochemical Validation of Chromium Getters in Intermediate Temperature-Solid Oxide Fuel Cells. United States. doi:10.1149/2.0931913jes.
Heo, Su Jeong, Hong, Junsung, Aphale, Ashish, Hu, Boxun, and Singh, Prabhakar. Wed .
"Chromium Poisoning of La 1-x Sr x MnO 3±δ Cathodes and Electrochemical Validation of Chromium Getters in Intermediate Temperature-Solid Oxide Fuel Cells". United States. doi:10.1149/2.0931913jes.
@article{osti_1562978,
title = {Chromium Poisoning of La 1-x Sr x MnO 3±δ Cathodes and Electrochemical Validation of Chromium Getters in Intermediate Temperature-Solid Oxide Fuel Cells},
author = {Heo, Su Jeong and Hong, Junsung and Aphale, Ashish and Hu, Boxun and Singh, Prabhakar},
abstractNote = {The effect of chromium poisoning on electrochemical performance degradation has been studied at intermediate temperatures (550-650 degrees C) using La1-xSrxMnO3±δ (LSM) cathode and an electrochemical cell configuration air/LSM//YSZ//Pt/air. A rapid increase in polarization resistance is observed in the presence of gaseous chromium species containing humid air (3% H2O) at both 550 degrees C and 650 degrees C. Cross-sectional elemental mapping and high-resolution transmission electron microscopy of the LSM/YSZ interface show the presence of crystalline Cr2O3 and (Mn,Cr)3O4 phases indicating reduction of gaseous hexavalent-chromium species and deposition of solid reaction products. Subsequent experiments, performed under the above exposure conditions but in the presence of a chromium getter, showed stable polarization resistance. The electrochemical performance of half-cells in Cr-containing humid air atmosphere and in the presence of the chromium getter also remained stable during 100-h tests at 550 and 650 degrees C, respectively. The post-test structural and chemical analysis of the electrode, electrode-electrolyte interface and getter by scanning- transmission electron microscopy, energy dispersive X-ray and Raman spectroscopy showed that the cathode bulk and cathode- electrolyte interface remained free of chromium deposits whereas chromium species deposited near the air inlet region of the porous getter as crystalline SrCrO4.},
doi = {10.1149/2.0931913jes},
journal = {Journal of the Electrochemical Society},
number = 13,
volume = 166,
place = {United States},
year = {2019},
month = {8}
}
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DOI: 10.1149/2.0931913jes
DOI: 10.1149/2.0931913jes
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