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Title: Novel Surface-Functionalized Powders for Solid Oxide Fuel Cells

Abstract

This project demonstrated a novel way to improve the performance and reliability of high performance Sr containing cathodes in solid oxide fuel cells (SOFCs). Such cathodes are subject to unacceptable degradation rates due to migration of mobile cations during elevated temperature operation, particularly Sr. This project demonstrated that surface modification of the cathode powder prior to fabrication of the SOFC is an effective route to similar performance and reliability enhancements such as infill type processes, but with an approach that allows a simple “drop-in” replacement of the existing cathode powder. Atomic layer deposition (ALD) was used to surface modify SOFC powders. ALD methods were developed that resulted in uniform coatings, and the effect on sintered microstructure and electrical performance were examined. Microstructures of cathodes sintered under normal manufacturing conditions using surface modified powder were very similar to those of untreated LSCF. Additionally, pore size distribution was also very similar. Electrochemical impedance testing showed that the largest effect of ALD powder surface modification was on cathode surface effects (charge transfer and non-charge transfer), with little effect on gas flow through the cathode (consistent with physical morphology of the sintered cathode). TEM studies after testing showed decreased Sr segregation on the fuelmore » cells fabricated with surface modified LSCF powders.« less

Authors:
Publication Date:
Research Org.:
Sonata Scientific LLC
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
1532744
Report Number(s):
DOE-SONATA-SC0013116-2
DOE Contract Number:  
SC0013116
Type / Phase:
SBIR (Phase II)
Resource Type:
Technical Report
Country of Publication:
United States
Language:
English
Subject:
30 DIRECT ENERGY CONVERSION; 36 MATERIALS SCIENCE; 77 NANOSCIENCE AND NANOTECHNOLOGY; ALD, SOFC, Cathode, Surface Modification

Citation Formats

Roeder, Jeffrey F. Novel Surface-Functionalized Powders for Solid Oxide Fuel Cells. United States: N. p., 2019. Web.
Roeder, Jeffrey F. Novel Surface-Functionalized Powders for Solid Oxide Fuel Cells. United States.
Roeder, Jeffrey F. Wed . "Novel Surface-Functionalized Powders for Solid Oxide Fuel Cells". United States.
@article{osti_1532744,
title = {Novel Surface-Functionalized Powders for Solid Oxide Fuel Cells},
author = {Roeder, Jeffrey F},
abstractNote = {This project demonstrated a novel way to improve the performance and reliability of high performance Sr containing cathodes in solid oxide fuel cells (SOFCs). Such cathodes are subject to unacceptable degradation rates due to migration of mobile cations during elevated temperature operation, particularly Sr. This project demonstrated that surface modification of the cathode powder prior to fabrication of the SOFC is an effective route to similar performance and reliability enhancements such as infill type processes, but with an approach that allows a simple “drop-in” replacement of the existing cathode powder. Atomic layer deposition (ALD) was used to surface modify SOFC powders. ALD methods were developed that resulted in uniform coatings, and the effect on sintered microstructure and electrical performance were examined. Microstructures of cathodes sintered under normal manufacturing conditions using surface modified powder were very similar to those of untreated LSCF. Additionally, pore size distribution was also very similar. Electrochemical impedance testing showed that the largest effect of ALD powder surface modification was on cathode surface effects (charge transfer and non-charge transfer), with little effect on gas flow through the cathode (consistent with physical morphology of the sintered cathode). TEM studies after testing showed decreased Sr segregation on the fuel cells fabricated with surface modified LSCF powders.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2019},
month = {7}
}

Technical Report:
This technical report may be released as soon as August 20, 2023
Other availability
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