skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: ELECTRICAL CONTACTS BETWEEN CATHODES AND METALLIC INTERCONNECTS IN SOLID OXIDE FUEL CELLS

Abstract

To minimize electrical resistance and maximize power output, contact layers are often applied between interconnects and electrodes during construction of a SOFC stack. In this work, simulated cathode/interconnect structures were used to investigate the effects of different contact materials on the contact resistance between a LSF cathode and a Crofer22 APU interconnect. The results from the resistance measurements are reported and correlated to interfacial interactions occurring between the metallic interconnect and the contact materials, particularly perovskites. The materials requirements for the contact layers between cathodes and metallic interconnects in intermediate temperature SOFCs are also discussed.

Authors:
; ;
Publication Date:
Research Org.:
Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1048627
Report Number(s):
PNNL-SA-44018
AA2530000; TRN: US201216%%1054
DOE Contract Number:
AC05-76RL01830
Resource Type:
Conference
Resource Relation:
Conference: Advances in Solid Oxide Fuel Cells. A Collection of Papers Presented at the 29th International Conference on Advanced Ceramics and Composites, January 23-28, 2005, Cocoa Beach, Florida: Ceramic Engineering and Science Proceedings, 26(4):217-224
Country of Publication:
United States
Language:
English
Subject:
30 DIRECT ENERGY CONVERSION; CATHODES; CERAMICS; CONSTRUCTION; ELECTRIC CONDUCTIVITY; ELECTRODES; PEROVSKITES; SOLID OXIDE FUEL CELLS; interfacial resistencance; simulated cathode; interconnect structures; SOFC

Citation Formats

Yang, Zhenguo, Xia, Guanguang, and Stevenson, Jeffry W. ELECTRICAL CONTACTS BETWEEN CATHODES AND METALLIC INTERCONNECTS IN SOLID OXIDE FUEL CELLS. United States: N. p., 2005. Web. doi:10.1002/9780470291245.ch25.
Yang, Zhenguo, Xia, Guanguang, & Stevenson, Jeffry W. ELECTRICAL CONTACTS BETWEEN CATHODES AND METALLIC INTERCONNECTS IN SOLID OXIDE FUEL CELLS. United States. doi:10.1002/9780470291245.ch25.
Yang, Zhenguo, Xia, Guanguang, and Stevenson, Jeffry W. Mon . "ELECTRICAL CONTACTS BETWEEN CATHODES AND METALLIC INTERCONNECTS IN SOLID OXIDE FUEL CELLS". United States. doi:10.1002/9780470291245.ch25.
@article{osti_1048627,
title = {ELECTRICAL CONTACTS BETWEEN CATHODES AND METALLIC INTERCONNECTS IN SOLID OXIDE FUEL CELLS},
author = {Yang, Zhenguo and Xia, Guanguang and Stevenson, Jeffry W.},
abstractNote = {To minimize electrical resistance and maximize power output, contact layers are often applied between interconnects and electrodes during construction of a SOFC stack. In this work, simulated cathode/interconnect structures were used to investigate the effects of different contact materials on the contact resistance between a LSF cathode and a Crofer22 APU interconnect. The results from the resistance measurements are reported and correlated to interfacial interactions occurring between the metallic interconnect and the contact materials, particularly perovskites. The materials requirements for the contact layers between cathodes and metallic interconnects in intermediate temperature SOFCs are also discussed.},
doi = {10.1002/9780470291245.ch25},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Mon Nov 28 00:00:00 EST 2005},
month = {Mon Nov 28 00:00:00 EST 2005}
}

Conference:
Other availability
Please see Document Availability for additional information on obtaining the full-text document. Library patrons may search WorldCat to identify libraries that hold this conference proceeding.

Save / Share:
  • To minimize electrical resistance, contact layers are often included between interconnects and electrodes during construction of a SOFC stack. In this work, simulated cathode/interconnect structures were used to investigate the effects of different contact materials on the contact resistance between a LSF cathode and a Crofer22 APU interconnect.. The results from the resistance measurements are reported and correlated to interfacial interactions occurring between the metallic interconnect and the contact materials, particularly perovskites. The materials requirements for the contact layers between cathodes and metallic interconnects in intermediate temperature SOFCs are also discussed.
  • No abstract prepared.
  • Hydrogen is the main fuel for all types of fuel cells except direct methanol fuel cells. Hydrogen can be generated from all manner of fossil fuels, including coal, natural gas, diesel, gasoline, other hydrocarbons, and oxygenates (e.g., methanol, ethanol, butanol, etc.). Impurities in the fuel can cause significant performance problems and sulfur, in particular, can decrease the cell performance of fuel cells, including solid oxide fuel cells (SOFC). In the SOFC, the high (800-1000°C) operating temperature yields advantages (e.g., internal fuel reforming) and disadvantages (e.g., material selection and degradation problems). Significant progress in reducing the operating temperature of the SOFCmore » from ~1000 ºC to ~750 ºC may allow less expensive metallic materials to be used for interconnects and as balance of plant (BOP) materials. This paper provides insight on the material performance of nickel, ferritic steels, and nickel-based alloys in fuels containing sulfur, primarily in the form of H2S, and seeks to quantify the extent of possible degradation due to sulfur in the gas stream.« less
  • With the steady reduction in solid oxide fuel cell (SOFC) operating temperatures into a range of 650-800C, cost effective metallic materials, in particular high temperature oxidation resistant alloys, have become promising candidates, in place of ceramic counterparts, for construction of interconnects in SOFC stacks. For a lifetime of thousands of hours, the alloys must demonstrate excellent surface, structural and electrical stability, and compatibility with other components in SOFC stacks in a very challenging environment. The paper provides a comprehensive critical review of metallic interconnects for SOFCs with a focus on recent progress in materials development, as well as advances inmore » understanding materials degradation and interfacial phenomena under the SOFC operating conditions. It also attempts to provide guiding principles for development of optimized, cost-effective metallic interconnect materials that can demonstrate satisfactory life-time stability and performance.« less