TY - JOUR
T1 - Microstructure and area specific resistance of cathodic half cells for solid oxide fuel cells composed of perovskite-type cathodes and Co-alloy-coated ferritic stainless steel interconnects
AU - Gan, Lu
AU - Montero, Xabier
AU - Sheikh, Saad Ahmed
AU - Saeki, Isao
AU - Murakami, Hideyuki
N1 - Funding Information:
This work was financially supported by the NIMS research program (Waseda-NIMS Joint Graduate School Program). The authors appreciate Nippon Steel Technology Co., Ltd for providing technique support of ASR measurement.
Funding Information:
This work was financially supported by the NIMS research program (Waseda-NIMS Joint Graduate School Program). The authors appreciate Nippon Steel Technology Co. Ltd for providing technique support of ASR measurement.
Publisher Copyright:
© 2020 Elsevier B.V.
PY - 2021/1/25
Y1 - 2021/1/25
N2 - In order to prevent oxidation and Cr poisoning, a Co-W coating has been applied on ferritic stainless steel (FSS), which is used as the interconnect parts of solid oxide fuel cells (SOFCs). However, the electrical properties of the Co–W-coated stainless steels have not yet been evaluated. In this study, cathodic half-cells were experimentally manufactured with La0.8Sr0.2MnO3 (LSM) and La0.8Sr0.2Co0.8Fe0.2O3 (LSCF) as cathodes, and uncoated, Co-coated, and Co–W-coated FSSs as interconnects, respectively. Then their oxidation property and area-specific resistance (ASR) were evaluated at 800 °C. Based on phase identification and microstructural analysis, the Co–W-coating was confirmed to effectively suppress the Cr poisoning of the cathode. The ASR values of the Co–W-coated steel with LSM and LSCF as cathodes were 102 and 97 mΩ cm2, respectively, which are adequate for SOFC application. Furthermore, when the LSM was applied as a cathode material, the formation of Mn spinels enhanced the adherence between the cathode and interconnected parts. Thus, the combination of Co–W-coated FSS steel with LSM as the cathode material exhibited the optimal combination of electrical conductivity and microstructural stability. Graphic abstract.
AB - In order to prevent oxidation and Cr poisoning, a Co-W coating has been applied on ferritic stainless steel (FSS), which is used as the interconnect parts of solid oxide fuel cells (SOFCs). However, the electrical properties of the Co–W-coated stainless steels have not yet been evaluated. In this study, cathodic half-cells were experimentally manufactured with La0.8Sr0.2MnO3 (LSM) and La0.8Sr0.2Co0.8Fe0.2O3 (LSCF) as cathodes, and uncoated, Co-coated, and Co–W-coated FSSs as interconnects, respectively. Then their oxidation property and area-specific resistance (ASR) were evaluated at 800 °C. Based on phase identification and microstructural analysis, the Co–W-coating was confirmed to effectively suppress the Cr poisoning of the cathode. The ASR values of the Co–W-coated steel with LSM and LSCF as cathodes were 102 and 97 mΩ cm2, respectively, which are adequate for SOFC application. Furthermore, when the LSM was applied as a cathode material, the formation of Mn spinels enhanced the adherence between the cathode and interconnected parts. Thus, the combination of Co–W-coated FSS steel with LSM as the cathode material exhibited the optimal combination of electrical conductivity and microstructural stability. Graphic abstract.
KW - Cathodic half-cell
KW - Co–W coating
KW - Electrical conductivity
KW - Oxidation
KW - Solid oxide fuel cell
UR - http://www.scopus.com/inward/record.url?scp=85097384222&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85097384222&partnerID=8YFLogxK
U2 - 10.1016/j.surfcoat.2020.126659
DO - 10.1016/j.surfcoat.2020.126659
M3 - Article
AN - SCOPUS:85097384222
SN - 0257-8972
VL - 406
JO - Surface and Coatings Technology
JF - Surface and Coatings Technology
M1 - 126659
ER -