Development of Toho Gas's SOFC Cells for Durability Improvement

摘要

SOFCs are expected to achieve high electrical conversion efficiency in a wide range of output class, for example CHP systems with small generating power, but an improvement in durability performance is needed for further popularization. Toho Gas aims to commercialize SOFC as a city gas CHP in commercial use. As a part of product development, we are working on ways to prevent physical damage to the SOFC cells and cathode delamination. In order to decrease abrasion, it is effective to raise the cathode's firing temperature. However, the electrical performance of cells could decrease if the temperature is too high. Therefore, we need to find an adequate firing temperature that is good for both durability and electrical performance. This paper reports on the relationship amongst the electrical performance, interfacial state, durability performance and firing temperature of SOFC cells (planar type of ScSZ electrolyte supported cell).