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

Title: Enhanced Densification of SDC Barrier Layers

Abstract

This technical report explores the Enhanced Densification of SCD Barrier Layers A samaria-doped ceria (SDC) barrier layer separates the lanthanum strontium cobalt ferrite (LSCF) cathode from the yttria-stabilized zirconia (YSZ) electrolyte in a solid oxide fuel cell (SOFC) to prevent the formation of electrically resistive interfacial SrZrO{sub 3} layers that arise from the reaction of Sr from the LSCF with Zr from the YSZ. However, the sintering temperature of this SDC layer must be limited to {approx}1200 C to avoid extensive interdiffusion between SDC and YSZ to form a resistive CeO{sub 2}-ZrO{sub 2} solid solution. Therefore, the conventional SDC layer is often porous and therefore not as impervious to Sr-diffusion as would be desired. In the pursuit of improved SOFC performance, efforts have been directed toward increasing the density of the SDC barrier layer without increasing the sintering temperature. The density of the SDC barrier layer can be greatly increased through small amounts of Cu-doping of the SDC powder together with increased solids loading and use of an appropriate binder system in the screen print ink. However, the resulting performance of cells with these barrier layers did not exhibit the expected increase in accordance with that achieved with the prototypicalmore » PLD SDC layer. It was determined by XRD that increased sinterability of the SDC also results in increased interdiffusivity between the SDC and YSZ, resulting in formation of a highly resistive solid solution.« less

Authors:
; ; ;
Publication Date:
Research Org.:
Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1035436
Report Number(s):
PNNL-20908
AA2530000; TRN: US201205%%114
DOE Contract Number:  
AC05-76RL01830
Resource Type:
Technical Report
Country of Publication:
United States
Language:
English
Subject:
30 DIRECT ENERGY CONVERSION; BINDERS; CATHODES; COBALT; ELECTROLYTES; FERRITE; LANTHANUM; PERFORMANCE; SCREENS; SINTERING; SOLID OXIDE FUEL CELLS; SOLID SOLUTIONS; STRONTIUM; X-RAY DIFFRACTION

Citation Formats

Hardy, John S, Templeton, Jared W, Lu, Zigui, and Stevenson, Jeffry W. Enhanced Densification of SDC Barrier Layers. United States: N. p., 2011. Web. doi:10.2172/1035436.
Hardy, John S, Templeton, Jared W, Lu, Zigui, & Stevenson, Jeffry W. Enhanced Densification of SDC Barrier Layers. United States. https://doi.org/10.2172/1035436
Hardy, John S, Templeton, Jared W, Lu, Zigui, and Stevenson, Jeffry W. 2011. "Enhanced Densification of SDC Barrier Layers". United States. https://doi.org/10.2172/1035436. https://www.osti.gov/servlets/purl/1035436.
@article{osti_1035436,
title = {Enhanced Densification of SDC Barrier Layers},
author = {Hardy, John S and Templeton, Jared W and Lu, Zigui and Stevenson, Jeffry W},
abstractNote = {This technical report explores the Enhanced Densification of SCD Barrier Layers A samaria-doped ceria (SDC) barrier layer separates the lanthanum strontium cobalt ferrite (LSCF) cathode from the yttria-stabilized zirconia (YSZ) electrolyte in a solid oxide fuel cell (SOFC) to prevent the formation of electrically resistive interfacial SrZrO{sub 3} layers that arise from the reaction of Sr from the LSCF with Zr from the YSZ. However, the sintering temperature of this SDC layer must be limited to {approx}1200 C to avoid extensive interdiffusion between SDC and YSZ to form a resistive CeO{sub 2}-ZrO{sub 2} solid solution. Therefore, the conventional SDC layer is often porous and therefore not as impervious to Sr-diffusion as would be desired. In the pursuit of improved SOFC performance, efforts have been directed toward increasing the density of the SDC barrier layer without increasing the sintering temperature. The density of the SDC barrier layer can be greatly increased through small amounts of Cu-doping of the SDC powder together with increased solids loading and use of an appropriate binder system in the screen print ink. However, the resulting performance of cells with these barrier layers did not exhibit the expected increase in accordance with that achieved with the prototypical PLD SDC layer. It was determined by XRD that increased sinterability of the SDC also results in increased interdiffusivity between the SDC and YSZ, resulting in formation of a highly resistive solid solution.},
doi = {10.2172/1035436},
url = {https://www.osti.gov/biblio/1035436}, journal = {},
number = ,
volume = ,
place = {United States},
year = {Mon Sep 12 00:00:00 EDT 2011},
month = {Mon Sep 12 00:00:00 EDT 2011}
}