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A planar anode-supported electrolyte was fabricated using a tape casting method that involved a single step cofiring process. A standard NiO∕8YSZ cermet anode, 8mol% YSZ electrolyte, and a lanthanum strontium manganite cathode were used for the solid oxide fuel cell unit cell. A pressurized cofiring technique allows the creation of a thin layer of dense electrolyte about 10μm without warpage. The open circuit voltage of the unit cell indicated negligible fuel leakage through the electrolyte film due to the dense and crack-free electrolyte layer. An electrochemical test of the unit cell showed a maximum power density up to 0.173W∕cm2 at 900°C. Approximated electrochemical properties, e.g., activation energy, Ohmic resistance, and exchange current density, indicated that the cell performance was significantly influenced by the electrode properties of the unit cell.

Anode-supported electrolyte with a large electrode area of 7.5×7.5 cm2 was fabricated using tape casting method aided by co-sintering process, in which the thickness of electrolyte layer is about 10 μm. SEM morphology showed the thin film of electrolyte with dense and crack-free structure which was formed between anode and cathode. As a result, open circuit voltage (OCV) of unit cell was around 1.1 V and its maximum power density was 0.214 W/cm2 at 800{degree sign}C. Impedance results of unit cell indicated that the ohmic resistance was 0.267 Ωcm2 at 800{degree sign}C, which was a suitable for the operation of SOFC at the intermediate temperature. In this study, we demonstrated that the tape casting process aided by co-sintering method is a suitable method for the mass production of planar SOFC unit cell with large electrode area.

Li2MnO3-based composite, xLi2MnO3-(1--x)LiMO2 (M = Ni, Co, Mn, etc.), was synthesized via co-precipitation with sintering treatment. The composite material has hexagonal structure including a little of monoclinic with a nano-crystallite size. As a result, the material showed a specific redox behavior in the voltage range of 2.0-4.6 V and approximately 267 mAh/g of discharge capacity was obtained at the room temperature.

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