Evaluation of protective coatings for SOFC interconnects

J. Tallgren, M. Bianco, O. Himanen, O. Thomann, J. Kiviaho, J. Van Herle

Research output: Contribution to journalArticleScientificpeer-review

5 Citations (Scopus)

Abstract

Chromium poisoning is a widely recognized degradation process in solid oxide fuel cells (SOFC). Stainless steel interconnect plates, in direct contact with the cathode, have been identified as the major chromium source, raising a need for electrically conducting protective coatings for the interconnects. This work evaluates four different manganese-cobalt protective coatings manufactured on thin steel foils, made by three commercial companies and a research centre. Area specific resistance, coating microstructure, and chromium retention are compared. Measurements were done in a humid atmosphere over 1000 hours at 700 °C. An innovative measurement setup was used, in which the coated steel samples are stacked adjacent to thin palladium foils with a screen-printed lanthanum strontium cobalt layer, replicating an SOFC cathode. As a conclusion, TeerCoating Ltd's and Turbocoating S.p. A's coatings performed similar to the Sandvik Material Technology's cerium-cobalt reference coating, and could be employed as such in SOFC applications.
Original languageEnglish
Pages (from-to)1597-1608
JournalECS Transactions
Volume68
Issue number1
DOIs
Publication statusPublished - 2015
MoE publication typeA1 Journal article-refereed

Fingerprint

Protective coatings
Solid oxide fuel cells (SOFC)
Cobalt
Chromium
Coatings
Metal foil
Cathodes
Steel
Lanthanum
Cerium
Strontium
Palladium
Manganese
Stainless steel
Degradation
Microstructure
Industry

Keywords

  • cathodes
  • chromium
  • cobalt
  • manganese
  • fuel cells
  • protective coatings
  • stainless steel
  • area-specific resistances
  • chromium poisoning
  • degradation process

Cite this

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title = "Evaluation of protective coatings for SOFC interconnects",
abstract = "Chromium poisoning is a widely recognized degradation process in solid oxide fuel cells (SOFC). Stainless steel interconnect plates, in direct contact with the cathode, have been identified as the major chromium source, raising a need for electrically conducting protective coatings for the interconnects. This work evaluates four different manganese-cobalt protective coatings manufactured on thin steel foils, made by three commercial companies and a research centre. Area specific resistance, coating microstructure, and chromium retention are compared. Measurements were done in a humid atmosphere over 1000 hours at 700 °C. An innovative measurement setup was used, in which the coated steel samples are stacked adjacent to thin palladium foils with a screen-printed lanthanum strontium cobalt layer, replicating an SOFC cathode. As a conclusion, TeerCoating Ltd's and Turbocoating S.p. A's coatings performed similar to the Sandvik Material Technology's cerium-cobalt reference coating, and could be employed as such in SOFC applications.",
keywords = "cathodes, chromium, cobalt, manganese, fuel cells, protective coatings, stainless steel, area-specific resistances, chromium poisoning, degradation process",
author = "J. Tallgren and M. Bianco and O. Himanen and O. Thomann and J. Kiviaho and {Van Herle}, J.",
year = "2015",
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language = "English",
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pages = "1597--1608",
journal = "ECS Transactions",
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Evaluation of protective coatings for SOFC interconnects. / Tallgren, J.; Bianco, M.; Himanen, O.; Thomann, O.; Kiviaho, J.; Van Herle, J.

In: ECS Transactions, Vol. 68, No. 1, 2015, p. 1597-1608.

Research output: Contribution to journalArticleScientificpeer-review

TY - JOUR

T1 - Evaluation of protective coatings for SOFC interconnects

AU - Tallgren, J.

AU - Bianco, M.

AU - Himanen, O.

AU - Thomann, O.

AU - Kiviaho, J.

AU - Van Herle, J.

PY - 2015

Y1 - 2015

N2 - Chromium poisoning is a widely recognized degradation process in solid oxide fuel cells (SOFC). Stainless steel interconnect plates, in direct contact with the cathode, have been identified as the major chromium source, raising a need for electrically conducting protective coatings for the interconnects. This work evaluates four different manganese-cobalt protective coatings manufactured on thin steel foils, made by three commercial companies and a research centre. Area specific resistance, coating microstructure, and chromium retention are compared. Measurements were done in a humid atmosphere over 1000 hours at 700 °C. An innovative measurement setup was used, in which the coated steel samples are stacked adjacent to thin palladium foils with a screen-printed lanthanum strontium cobalt layer, replicating an SOFC cathode. As a conclusion, TeerCoating Ltd's and Turbocoating S.p. A's coatings performed similar to the Sandvik Material Technology's cerium-cobalt reference coating, and could be employed as such in SOFC applications.

AB - Chromium poisoning is a widely recognized degradation process in solid oxide fuel cells (SOFC). Stainless steel interconnect plates, in direct contact with the cathode, have been identified as the major chromium source, raising a need for electrically conducting protective coatings for the interconnects. This work evaluates four different manganese-cobalt protective coatings manufactured on thin steel foils, made by three commercial companies and a research centre. Area specific resistance, coating microstructure, and chromium retention are compared. Measurements were done in a humid atmosphere over 1000 hours at 700 °C. An innovative measurement setup was used, in which the coated steel samples are stacked adjacent to thin palladium foils with a screen-printed lanthanum strontium cobalt layer, replicating an SOFC cathode. As a conclusion, TeerCoating Ltd's and Turbocoating S.p. A's coatings performed similar to the Sandvik Material Technology's cerium-cobalt reference coating, and could be employed as such in SOFC applications.

KW - cathodes

KW - chromium

KW - cobalt

KW - manganese

KW - fuel cells

KW - protective coatings

KW - stainless steel

KW - area-specific resistances

KW - chromium poisoning

KW - degradation process

U2 - 10.1149/06801.1597ecst

DO - 10.1149/06801.1597ecst

M3 - Article

VL - 68

SP - 1597

EP - 1608

JO - ECS Transactions

JF - ECS Transactions

SN - 1938-5862

IS - 1

ER -