| ZHANG Yong,LI Qiang,WU Cai-hong,FU Ming-jun,MA Jiang,SUN Ye-ze-mou.Research Progress of Modified Mn-Co Spinel Coating of SOFCs Metal Interconnect[J],52(9):1-9 |
| Research Progress of Modified Mn-Co Spinel Coating of SOFCs Metal Interconnect |
| Received:May 31, 2022 Revised:September 08, 2022 |
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| DOI：10.16490/j.cnki.issn.1001-3660.2023.09.001 |
| KeyWord:solid oxide fuel cells Fe-Cr ferrite stainless steel Mn-Co spinel coatings modification mechanism conductivity oxidation resistance |
| Author | Institution |
| ZHANG Yong |
School of Material Science and Engineering, Chang'an University, Xi'an , China |
| LI Qiang |
School of Material Science and Engineering, Chang'an University, Xi'an , China |
| WU Cai-hong |
School of Material Science and Engineering, Chang'an University, Xi'an , China |
| FU Ming-jun |
School of Material Science and Engineering, Chang'an University, Xi'an , China |
| MA Jiang |
School of Material Science and Engineering, Chang'an University, Xi'an , China |
| SUN Ye-ze-mou |
School of Material Science and Engineering, Chang'an University, Xi'an , China |
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| Abstract: |
| Fe-Cr ferrite stainless steel is an ideal material for the interconnects of low and medium temperature solid oxide fuel cells (SOFCs), but its surface is easily oxidized in the high temperature aerobic environment and can cause "Cr poisoning" of the cathode, resulting in the reduction of cell efficiency. Mn-Co spinel is widely used as protective coatings for the interconnects to improve the oxidation resistance of the interconnects and reduce the diffusion of Cr. However, in the long-term service process of the Mn-Co spinel coating, there is still a phenomenon that the diffusion of Cr element leads to the continuous thickening of the Cr2O3 transition oxide layer and the decrease of the electrical conductivity of the coating. It is found that the above problems can be effectively improved by doping modification of Mn-Co spinel coatings. In this study, based on the research progress of Mn-Co spinel coating in recent years, the typical Mn-Co spinel crystal structure and its conduction mechanism were briefly described, and the possible doping sites of modified elements in Mn-Co spinel and their effects on the crystal structure of spinel were summarized. The effects of the modification of rare earth elements Y, La, Ce and transition group elements Cu and Fe on the oxidation resistance, electrical conductivity, adhesion and thermal expansion coefficient compatibility of Mn-Co spinel coatings were emphatically expounded, and the mechanism of modification elements was summarized. The focus of different elements on the modification of Mn-Co spinel coatings was summarized and compared. Finally, the problems existing in the Mn-Co spinel coating in the current research and the research direction of the modified Mn-Co spinel coating in the future were prospected. |
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