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https://doi.org/10.1149/ma2024-02231965mtgabs
Copy DOIPublication Date: Nov 22, 2024 | |
License type: iop-standard |
Solid oxide fuel cells (SOFC), a third-generation ultra-clean fuel cell, operate at a higher temperature of 600°C and have high energy conversion efficiency. SOFC is capable of a combined power generation system and produces water as a by-product, therefore is attracting attention as one of the eco-friendly power sources. As the SOFC interconnect material, ferritic stainless steel containing Cr is dominant, however it has the problem of durability which originates from the sublimation of Cr on the interconnect surface during high temperature operation. To suppress the Cr sublimation, research is being extensively conducted and the coating of a thin passivation material is thought as a promising solution. In this study, we selected Co thin film as a passivation layer and developed an electroplating technique where the uniformity of Co thin film in an air channel pattern is controlled using organic additives and current densities. The difference in thickness of electroplated Co thin film according to the position of the pattern were measured. In addition, the microstructure of the Co thin film was observed using an EBSD (electron backscatter diffraction) system, and the corresponding electrochemical behavior was analyzed. The uniformity of the Co thin film improved as the current density decreased, which is the result of the increase of Co ions reaching the bottom of the pattern. Furthermore, the combination of thiourea and saccharin led to the decrease in the grain size, resulting in enhancing the uniformity.
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