To overcome the limitations of the conventional Ni anode-supported SOFCs, various types of ceramic anodes have been studied. However, these ceramic anodes are difficult to commercialize because of their low cell performances and difficulty in manufacturing anode-support typed SOFCs. Therefore, in this study, to use these ceramic anodes and take advantage of anode-supported SOFC, which can minimize ohmic loss from the thin electrolyte, we fabricated cathode support-typed SOFC. The cathode-support of LSCF-YSZ was prepared by the acid treatment of conventional Ni-YSZ (Yttria-stabilized Zirconia) anode-support, followed by the infiltration of LSCF to YSZ scaffold. The composite of La(Sr)Ti(Ni)O3 and Ce(Mn, Fe)O2 was used as the ceramic anode. The fabricated cathode-supported button cell showed a relatively low power density of 0.207 Wcm-2 at 850℃; however, it is expected to show better performance through the optimization of the infiltration rate and thickness of LSCF-YSZ cathode-support layer.
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Sr1.95Fe1.35Ni0.15Mo0.5O6-δ Perovskite Oxide as Anode Material for Direct Linz-Donawitz Converter Gas Fueled Solid Oxide Fuel Cells Han-Bit Park, Ki-Tae Lee Journal of Electrical and Electronic Materials.2026; 39(4): 364. CrossRef
In this paper to improve the ionic conduction properties, lanthanum silicate apatite La9.33(SiO4)6O2 ceramic, which substituted by V ions at Si-site, were fabricated by the mixed-oxide method. And we investigated the structural and electrical properties of La9.33(Si6-□v□)6O26 specimens with variation of dopants for the application of solid oxide fuel cells. The sintering temperature of La9.33(Si6-□v□)O26 specimens decreased from 1,600℃ to 1,400℃. As results of X-ray diffraction patterns, all La9.33(Si6-□-□)O26 specimens showed the formation of a complete solid solution in a apatite polycrystallin structure. But the specimens doped with more than 1.5mol% showed the second phase, La2 SiO5 and SiO2. The specimen dopants with 1.0 mol% showed the maximum ion conductivity. Ion conducting and activation energy of the La9.33(Si5V1)O26 specimens were about 7.8×10-4 S/cm 1.62 eV at 600℃, respectively.
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Sr1.95Fe1.35Ni0.15Mo0.5O6-δ Perovskite Oxide as Anode Material for Direct Linz-Donawitz Converter Gas Fueled Solid Oxide Fuel Cells Han-Bit Park, Ki-Tae Lee Journal of Electrical and Electronic Materials.2026; 39(4): 364. CrossRef
In solid oxide fuel cell system, yttria-stabilized zirconia is generally adopted as the electrolyte, which has high strength and superior oxygen ion conductivity, and the air electrode and the fuel electrode are attached to this. Recently, new structure of ``layered planar SOFC module`` was suggested to solve there liability problem due to the high temperature stability of a sealing agent and a binding material. In this study to materialize the air electrode in a layered planar SOFC module, the LSM ink was coated to form homogeneous electrode in the channel after the ink preparation. As the porosity control agent, PMMA oractive carbon powder was adopted with use of a commercial dispersant in ethanol. The optimal amounts of both the porosity control agents and the dispersant were determined. Four (4) vol% of the dispersant for the LSM-PMMA case and 15 vol% for LSM-carbon powder showed the lowest viscosities respectively to indicate the best dispersed states of the slurries. With PMMA and carbon powder, sintered LSM ink shows the relatively homogeneous distributions of pores and with increases of the agents, the porosities increased in both cases. From this, it can be thought that the amount of the PMMA or carbon powder could be used to control the porosity of the LSM ink.
In this study, we have coated the inner surface of YSZ channel using LSM powder ink through depressurization process for making the cathode of a stacked planar-type SOFC module. To coat the surface of YSZ channel uniformly, we tried to find the optimum manufacturing condition for LSM ink. We used four different dispersants (BYK series) and two different solvents (ethanol and DMF) to make the LSM ink. It was revealed that the ink made with the ethanol solvent and the BYK-111 dispersant has the lowest viscosity, relatively low contact angle and most excellent dispersibility. After depressurizing a chamber filled with LSM ink and sintered YSZ channel, we have found that the YSZ channel was uniformly coated with LSM cathode. The LSM ink with 25 vol% BYK-111 showed the most uniform coating.
La7.33Bi2 (SiO4)6O2 specimens were fabricated by standard solid-state synthesis route for solid oxide electrolytes. The calcined powders exhibited uniform particles with a mean particle size of about 28μm. The room-temperature structure of La7.33Bi2 (SiO4)6O2 specimens was analyzed as hexagonal, space group P63 or P63/m, and the unit cell volume increased with increase a sintering temperature. The specimens sintered at 1,175℃ showed X-ray patterns of homogeneous apatite single phase without the second phase such as La2Si2O7 and La2SiO5. The specimen sintered at 1,175℃ showed the maximum sintered density of 5.49 g/cm3. Increasing the sintering temperature, total conductivities increased, activation energy decreased and the values were 1.98 × 10-5 Scm-1 and 1.23eV, respectively.
In the (La0.8Ca0.2)(Cr0.9Co0.1)O3 (LCCC), which has been using as interconnector materials in SOFC, Al ions were substituted for Co because ionic radius of Al is similar to that of Co. Because of the almost identical ionic radius of Al and Co, the substitution was not thought to be affect the tolerance factor of LCCC, and the densification behavior, high temperature electrical conductivity and thermal expansion coefficient were examined as a function of Al concentration. In the cases of the x= 0 and x= 0.02 in (La0.8Ca0.2)(Cr0.9Co0.1-xAlx)O3 (x= 0∼0.1), the samples showed the relative densities above ≥95% when those were sintered at ≥1,350℃. In the case of the x≥0.06 the sintered density deteriorated greatly at lower sintering temperatures. High temperature electrical conductivity of the samples decreased as the content of Al increased. Since the valence state of Al ion is unchangeable, while Cr or Co ions contribute to the electrical conduction by changing those valence states, Al substitution resulted in the decreased electrical conductivity. Al doping of LCCC was an effective way of decreasing the thermal expansion coefficient (TEC).
A layered planer SOFC module was designed from planar-type SOFC. It was prepared by multi-layered ceramic technology. To form the cathode and the anode in the layered structure, reliable channels should be made on the both side of electrolyte perpendicularly. However, monolithic SOFC using multi-layered ceramic technology hasn`t been studied another group, and the warpage of electrolyte in the channel, also, hasn`t been studied, when electrode is printed on the electrolyte. In this study, the channels are prepared with electrode printing, and their warpage are evaluated. In the case of YSZ without electrode, the warpages are nothing in the limit of measurement using optical microscope. The warpage of ``YSZ-NiO printed`` increases than that of ``NiO printed``, and also, the case of ``double electrode printed`` is similar to ``YSZ-NiO printed``. It is thought that, in the printed electrolyte, the warpage is related to the difference of the sintering behavior of each material.
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