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Title: Novel Approach to Strengthening Ceramic Cathode Contact and Validation in a Generic Stack Test Fixture

Abstract

The ceramic contact material at the cathode side has been identified as the weakest mechanical link in solid oxide fuel cells, due to poor sintering at low stack fabrication temperatures. In this work, a novel approach of mechanical interlocking with an engineered surface was proposed to strengthen LSM-type contacts. The engineered cathode surface was made by depositing large LSM20 granules onto a wet cathode print, followed by sintering. Granules of three sizes were tested (mesh #35, #60, and #100). Small coupons of anode-supported YSZ electrolyte with LSM cathode were joined at 850 and 950oC for 2h with LSM contact using either the engineered surface or plain surfaces. The results of contact strength measurements showed about 14 times increase with engineered surface compared to plain surfaces. Validation with a 2”x2” LSM-based cell in a generic stack fixture showed good thermal cycle stability with minimal change in ohmic impedance over ten cycles.

Authors:
; ;
Publication Date:
Research Org.:
Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1434873
Report Number(s):
PNNL-SA-131576
AA6040000
DOE Contract Number:
AC05-76RL01830
Resource Type:
Conference
Resource Relation:
Conference: ECS Transactions, 78(1):1713-1720
Country of Publication:
United States
Language:
English

Citation Formats

Chou, Yeong-Shyung, Bonnett, Jeff F., and Stevenson, Jeffry W. Novel Approach to Strengthening Ceramic Cathode Contact and Validation in a Generic Stack Test Fixture. United States: N. p., 2017. Web. doi:10.1149/07801.1713ecst.
Chou, Yeong-Shyung, Bonnett, Jeff F., & Stevenson, Jeffry W. Novel Approach to Strengthening Ceramic Cathode Contact and Validation in a Generic Stack Test Fixture. United States. doi:10.1149/07801.1713ecst.
Chou, Yeong-Shyung, Bonnett, Jeff F., and Stevenson, Jeffry W. Mon . "Novel Approach to Strengthening Ceramic Cathode Contact and Validation in a Generic Stack Test Fixture". United States. doi:10.1149/07801.1713ecst.
@article{osti_1434873,
title = {Novel Approach to Strengthening Ceramic Cathode Contact and Validation in a Generic Stack Test Fixture},
author = {Chou, Yeong-Shyung and Bonnett, Jeff F. and Stevenson, Jeffry W.},
abstractNote = {The ceramic contact material at the cathode side has been identified as the weakest mechanical link in solid oxide fuel cells, due to poor sintering at low stack fabrication temperatures. In this work, a novel approach of mechanical interlocking with an engineered surface was proposed to strengthen LSM-type contacts. The engineered cathode surface was made by depositing large LSM20 granules onto a wet cathode print, followed by sintering. Granules of three sizes were tested (mesh #35, #60, and #100). Small coupons of anode-supported YSZ electrolyte with LSM cathode were joined at 850 and 950oC for 2h with LSM contact using either the engineered surface or plain surfaces. The results of contact strength measurements showed about 14 times increase with engineered surface compared to plain surfaces. Validation with a 2”x2” LSM-based cell in a generic stack fixture showed good thermal cycle stability with minimal change in ohmic impedance over ten cycles.},
doi = {10.1149/07801.1713ecst},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Mon Dec 04 00:00:00 EST 2017},
month = {Mon Dec 04 00:00:00 EST 2017}
}

Conference:
Other availability
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