Akifusa Hagiwara

Behavior of CoO-NiO Solid Solution in Molten Carbonate

Focusing on the fact that cobalt oxide (CoO) and nickel oxide (NiO) form a good solid solution, we examined the behavior of this material in molten carbonate in order to evaluate the feasibility of the NiO cathode coated with stable lithium cobaltite (LiCoO 2 ). In the molten carbonate at 650°C, the CoO-NiO solid solution created LiCoO 2 on its surface. The solubility measurement results indicated a suppression of the Ni dissolution which seems attributable to the LiCoO 2 coating. However, during the long-range immersion treatment, the LiCoO 2 layer on the solid solution surface grew and partially broke away from the solid solution matrix. In the powder-based immersion test, it was also verified that LiCoO 2 particles grew to relatively large ones. For use as an alternative cathode material, it is necessary to suppress the crystal growth of the LiCoO 2 coating layer.

Dependence of Electrochemical Performance on Microstructure and Distribution for Ni/YSZ Anode with Y-Doped BaZrO3 in Solid Oxide Fuel Cells

Microstructure and Distribution for Ni/YSZ Anode with Y-doped BaZrO3 in Solid Oxide Fuel Cells Hiroyuki Shimada, Eiji Takami, Chikara Takei, Fuhito ohba, Akifusa Hagiwara, and Manabu Ihara Department of Chemistry, Graduate School of Science and Engineering, Tokyo Institute of Technology, Tokyo 152-8552, Japan R&D center, Engineering R&D Division, Tokyo Electric Power Company, Yokohama 230-8510, Japan