Mitigation of chromium poisoning of cathodes in solid oxide fuel cells employing CuMn1.8O4 spinel coating on metallic interconnect

JOURNAL OF POWER SOURCES

卷:376

Article

Wang, Ruofan^1,3  Sun, Zhihao¹  Pal, Uday B.^1,2  Gopalan, Srikanth^1,2  Basu, Soumendra N.^1,2 

[1] Boston Univ, Div Mat Sci & Engn, Brookline, MA 02446 USA

[2] Boston Univ, Dept Mech Engn, Boston, MA 02215 USA

[3] Lawrence Berkeley Natl Lab, Energy Technol Area, Energy Convers Grp, Berkeley, CA 94720 USA

关键词: Solid oxide fuel cells;    Cathode;    Chromium poisoning;    Copper manganese spinel coatings;    Interconnects;    Degradation;   

DOI  :  10.1016/j.jpowsour.2017.11.069

来源: Elsevier

【 摘 要 】

Chromium poisoning is one of the major reasons for cathode performance degradation in solid oxide fuel cells (SOFCs). To mitigate the effect of Cr-poisoning, a protective coating on the surface of interconnect for suppressing Cr vaporization is necessary. Among the various coating materials, Cu-Mn spinel coating is considered to be a potential candidate due to their good thermal compatibility, high stability and good electronic conductivity at high temperature. In this study, Crofer 22 H meshes with no protective coating, those with commercial CuMn2O4 spinel coating and the ones with lab-developed CuMn1.8O4 spinel coating were investigated. The lab-developed CuMn1.8O4 spinel coating were deposited on Crofer 22 H mesh by electrophoretic deposition and densified by a reduction and re-oxidation process. With these different Crofer 22 H meshes (bare, CuMn2O4-coated, and CuMn1.8O4-coated), anode-supported SOFCs with Sr-doped LaMnO3-based cathode were electrochemically tested at 800 degrees C for total durations of up to 288 h. Comparing the mitigating effects of the two types of Cu-Mn spinel coatings on Cr-poisoning, it was found that the performance of the denser lab-developed CuMn1.8O4 spinel coating was distinctly better, showing no degradation in the cell electrochemical performance and significantly less Cr deposition near the cathode/electrolyte interface after the test.

【 授权许可】

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