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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

Abstract

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.

Authors:
; ORCiD logo; ; ;
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; /jes/166/13/F990.atom
Grant/Contract Number:  
FE 0023385; AC36-08GO28308; FE-0023385
Resource Type:
Published Article
Journal Name:
Journal of the Electrochemical Society
Additional Journal Information:
Journal Name: Journal of the Electrochemical Society 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.
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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. https://doi.org/10.1149/2.0931913jes
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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. https://doi.org/10.1149/2.0931913jes.
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@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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Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record
https://doi.org/10.1149/2.0931913jes
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Figures / Tables:

Figure 1 Figure 1: (a) Electrochemical performance (I-t curve) and impedance spectra of the half-cell in the presence of Cr vapors at (b) 650°C and (c) 550°C. SEM images of the cross-sections of the LSM/YSZ interface after the test in 3% H2O/air in the presence of Cr vapor at (d) 650°C andmore » (e) 550°C, and (f) EDS spectrum at the LSM/YSZ interface in Figure 1d (marked by a red box).« less
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