Highly dense Mn3O4 and CuMn2O4 spinels as efficient protective coatings on solid oxide fuel cell interconnect and their chromium diffusion studies

Improving the durability of cobaltite cathode of solid oxide fuel cells – a review

“…Both spinel materials showed good electronic conductivity over a range of temperatures with CuMn 2 O 4 showed a slightly improved conductivity behavior. Acharya et al 117 attributed this result to addition of Cu as it creates voids resulting in better carrier conduction mechanism. Moreover, these materials maintained their ASR over the period of 1000 h with a slight decrease in the case of CuMn 2 O 4 spinel as depicted in Fig.…”

“…One group of researchers 117 choose Mn 3 O 4 and CuMn 2 O 4 spinel and characterized it using powder X-ray diffraction and scanning electron microscope. A spinel coating over SUS430 interconnect was placed in a muffle furnace at 800 °C for 1000 h; the samples were removed after every 100 h to undergo Energy Dispersive Spectroscopy (EDS) and FESEM.…”

Fabrication and Oxidation Behavior of the Cu–Fe Spinel Coating for SOFC Steel Interconnect Applications

“…Oxidation behaviors of FSS interconnects, protected by dip-coated oxide layers, have provided very promising results. − However, the application of the Cu–Fe spinel coating on metallic interconnects by the dip-coating technique can be rarely seen in the literature, and this motivates the present study. In addition, inspired by the dip-coating process of dense SOFC electrolytes, , the Cu–Fe spinel powders were synthesized by the sol–gel method in this study, followed by the preparation of coating slurry and the dip-coating process to form a protective coating on the steel substrate.…”

Metallic Co with Reactive Element Oxide Composite Coatings for Solid Oxide Fuel Cell Interconnect Applications

“…Perovskite coatings have a high oxygen ion conductivity, which leads to the inward diffusion of oxygen ions, resulting in a thicker oxide scale; moreover, the high sintering temperature of perovskites makes it difficult for the coating to be dense, which is ineffective in protecting the metallic interconnects . Spinel not only has good electrical conductivity and matches the CTE of other components but also shows good absorption capacity for Cr and Cr oxides, which can inhibit Cr poisoning to the cathode. − Petric and Ling investigated the electrical conductivity and CTE of a large number of spinel materials, and the results showed that Co 3 O 4 , Cu x Mn 3– x O 4 , and Mn x Co 3– x O 4 (1 < x < 1.5) were the most suitable coating materials for the SOFC interconnects. Among them, the Co 3 O 4 spinel coating has a suitable CTE, excellent electrical conductivity and oxidation resistance, and the ability to prevent Cr volatilization. − Moreover, by combination with reactive elements or their oxides, the high-temperature oxidation resistance of the coating can be further improved and its life in SOFC stacks can be extended.…”

“…17 Spinel not only has good electrical conductivity and matches the CTE of other components but also shows good absorption capacity for Cr and Cr oxides, which can inhibit Cr poisoning to the cathode. 18 with reactive elements or their oxides, the high-temperature oxidation resistance of the coating can be further improved and its life in SOFC stacks can be extended. Adding a small amount of reactive elements (such as Y, Ce, etc.)…”