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박범경,송락현,이승복,임탁형,박석주,박종욱,이종원,Park, Beom-Kyeong,Song, Rak-Hyun,Lee, Seung-Bok,Lim, Tak-Hyoung,Park, Seok-Joo,Park, Chong-Ook,Lee, Jong-Won 한국세라믹학회 2014 한국세라믹학회지 Vol.51 No.4
An interconnect in solid oxide fuel cells (SOFCs) electrically connects unit cells and separates fuel from oxidant in the adjoining cells. The interconnects can be divided broadly into two categories - ceramic and metallic interconnects. A thin and gastight ceramic layer is deposited onto a porous support, and metallic interconnects are coated with conductive ceramics to improve their surface stability. This paper provides a short review on ceramic materials for SOFC interconnects. After a brief discussion of the key requirements for interconnects, the article describes basic aspects of chromites and titanates with a perovskite structure for ceramic interconnects, followed by the introduction of dual-layer interconnects. Then, the paper presents protective coatings based on spinel-or perovskite-type oxides on metallic interconnects, which are capable of mitigating oxide scale growth and inhibiting Cr evaporation.
박범경(Park, Beom-Kyeong),이종원(Lee, Jong-Won),이승복(Lee, Seung-Bok),임탁형(Lim, Tak-Hyoung),박석주(Park, Seok-Joo),송락현(Song, Rak-Hyun),신동열(Shin, Dong-Ryul) 한국신재생에너지학회 2010 한국신재생에너지학회 학술대회논문집 Vol.2010 No.11
A strontium titanate (SrTiO₃)-based material with a perovskite structure is considered to be one of the promising alternatives to LaCrO₃-based materials since SrTiO₃ perovskite shows a high chemical stability under both oxidizing and reducing atmospheres at high temperatures. SrTiO₃ materials exhibit an n-type semiconducting behavior when it is donor-doped and/or exposed to a reducing atmosphere. In this work, Sr_{1-x}La_xTi_{1-y}M_yO₃ materials doped with La^{3+} in A-sites and aliovalent transition metal ions (M^{n+}) in B-sites were synthesized by the modified Pechini method. The X-ray diffraction analysis indicated that the materials synthesized by the Pechini process exhibited a single curbic perovskite-type structure without any impurity phases, and are tolerant, to some extent, to cation doping. The sintering behaviors of Sr_{1-x}La_xTi_{1-y}M_yO₃ in H₂/N₂ and air were characterized by dilatometry and microstructural observations. The electrical conduction mechanism and the dopant effect are discussed based on the defect structures and the electrical conductivities measured at various oxygen partial pressures and temperatures.
Nurhadi S. Waluyo,박범경,송락현,이승복,임탁형,박석주,이종원 한국세라믹학회 2015 한국세라믹학회지 Vol.52 No.5
An interconnect is the key component of solid oxide fuel cells that electrically connects unit cells and separates fuel from oxidant in the adjoining cells. To improve their surface stability in high-temperature oxidizing environments, metallic interconnects are usually coated with conductive oxides. In this study, lanthanum nickelates (LaNiO3) with a perovskite structure are synthesized and applied as protective coatings on a metallic interconnect (Crofer 22 APU). The partial substitution of Co, Cu, and Fe for Ni improves electrical conductivity as well as thermal expansion match with the Crofer interconnect. The protective perovskite layers are fabricated on the interconnects by a slurry coating process combined with optimized heat-treatment. The perovskite-coated interconnects show area-specific resistances as low as 16.5 - 37.5 m Ω·cm2 at 800oC.