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Title: Strontium Manganese Oxide Getter for Capturing Airborne Cr and S Contaminants in High-Temperature Electrochemical Systems

Abstract

Traces (ppm to ppb level) of airborne contaminants such as CrO2(OH)2 and SO2 irreversibly degrade the electrochemical activity of air electrodes in high-temperature electrochemical devices such as solid oxide fuel cells by retarding oxygen reduction reactions. The use of getter has been proposed as a cost-effective strategy to mitigate the electrode poisoning. However, owing to the harsh operating conditions (i.e., exposure to heat and moisture), the long-term durability of getter materials remains a considerable challenge. In this study, we report our findings on strontium manganese oxide (SMO) as a robust getter material for cocapture of airborne Cr and S contaminants. The SMO getter with a 3D honeycomb architecture, fabricated via slurry dip-coating, successfully maintains the electrochemical activity of solid oxide cells under the flow of gaseous Cr and S species, validating the getter's capability of capturing traces of Cr and S contaminants. Investigations found that both Sr and Mn cations contribute to the absorption reaction and that the reaction processes are accompanied by morphological elongation in the form of SrSO4 nanorods and SrCrO4 whiskers, which favors continued absorption and reaction of incoming S and Cr contaminants. The SMO getter also displays robust stability at high temperatures and in humid environmentsmore » without phase transformation and hydrolysis. These results demonstrate the feasibility of the use of SMO getter under severe operating conditions representative of high-temperature electrochemical systems.« less

Authors:
ORCiD logo [1];  [1]; ORCiD logo [2];  [1];  [1];  [1]; ORCiD logo [1]
  1. Univ. of Connecticut, Storrs, CT (United States)
  2. Univ. of Connecticut, Storrs, CT (United States); National Renewable Energy Lab. (NREL), Golden, CO (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)
OSTI Identifier:
1566054
Report Number(s):
NREL/JA-5K00-74932
Journal ID: ISSN 1944-8244
Grant/Contract Number:  
AC36-08GO28308
Resource Type:
Accepted Manuscript
Journal Name:
ACS Applied Materials and Interfaces
Additional Journal Information:
Journal Volume: 11; Journal Issue: 38; Journal ID: ISSN 1944-8244
Publisher:
American Chemical Society (ACS)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; getter; chromium capture; sulfur capture; strontium manganese oxide; stability; high-temperature electrochemical systems

Citation Formats

Hong, Junsung, Aphale, Ashish N., Heo, Su Jeong, Hu, Boxun, Reisert, Michael, Belko, Seraphim, and Singh, Prabhakar. Strontium Manganese Oxide Getter for Capturing Airborne Cr and S Contaminants in High-Temperature Electrochemical Systems. United States: N. p., 2019. Web. doi:10.1021/acsami.9b09677.
Hong, Junsung, Aphale, Ashish N., Heo, Su Jeong, Hu, Boxun, Reisert, Michael, Belko, Seraphim, & Singh, Prabhakar. Strontium Manganese Oxide Getter for Capturing Airborne Cr and S Contaminants in High-Temperature Electrochemical Systems. United States. doi:https://doi.org/10.1021/acsami.9b09677
Hong, Junsung, Aphale, Ashish N., Heo, Su Jeong, Hu, Boxun, Reisert, Michael, Belko, Seraphim, and Singh, Prabhakar. Wed . "Strontium Manganese Oxide Getter for Capturing Airborne Cr and S Contaminants in High-Temperature Electrochemical Systems". United States. doi:https://doi.org/10.1021/acsami.9b09677. https://www.osti.gov/servlets/purl/1566054.
@article{osti_1566054,
title = {Strontium Manganese Oxide Getter for Capturing Airborne Cr and S Contaminants in High-Temperature Electrochemical Systems},
author = {Hong, Junsung and Aphale, Ashish N. and Heo, Su Jeong and Hu, Boxun and Reisert, Michael and Belko, Seraphim and Singh, Prabhakar},
abstractNote = {Traces (ppm to ppb level) of airborne contaminants such as CrO2(OH)2 and SO2 irreversibly degrade the electrochemical activity of air electrodes in high-temperature electrochemical devices such as solid oxide fuel cells by retarding oxygen reduction reactions. The use of getter has been proposed as a cost-effective strategy to mitigate the electrode poisoning. However, owing to the harsh operating conditions (i.e., exposure to heat and moisture), the long-term durability of getter materials remains a considerable challenge. In this study, we report our findings on strontium manganese oxide (SMO) as a robust getter material for cocapture of airborne Cr and S contaminants. The SMO getter with a 3D honeycomb architecture, fabricated via slurry dip-coating, successfully maintains the electrochemical activity of solid oxide cells under the flow of gaseous Cr and S species, validating the getter's capability of capturing traces of Cr and S contaminants. Investigations found that both Sr and Mn cations contribute to the absorption reaction and that the reaction processes are accompanied by morphological elongation in the form of SrSO4 nanorods and SrCrO4 whiskers, which favors continued absorption and reaction of incoming S and Cr contaminants. The SMO getter also displays robust stability at high temperatures and in humid environments without phase transformation and hydrolysis. These results demonstrate the feasibility of the use of SMO getter under severe operating conditions representative of high-temperature electrochemical systems.},
doi = {10.1021/acsami.9b09677},
journal = {ACS Applied Materials and Interfaces},
number = 38,
volume = 11,
place = {United States},
year = {2019},
month = {8}
}

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Works referencing / citing this record:

A highly active and Cr-resistant infiltrated cathode for practical solid oxide fuel cells
journal, January 2020

  • Yang, Tianrang; Wen, Yeting; Wu, Tao
  • Journal of Materials Chemistry A, Vol. 8, Issue 1
  • DOI: 10.1039/c9ta11657e