|About this Abstract
||2018 TMS Annual Meeting & Exhibition
||Materials for Energy Conversion and Storage
||B-29: Thermal Conductivity and Thermal Expansion of Ba(Ce0.8-xZrxY0.2)O3-δ Applicable for an Electrolyte of Solid Oxide Fuel Cells
||Hirotomo Sumikawa, Ken Kurosaki, Yuji Ohishi, Hiroaki Muta, Shinsuke Yamanaka
|On-Site Speaker (Planned)
Solid oxide fuel cell (SOFC) is known as a fuel cell with high conversion efficiency, long-term stability, and relatively low cost. The SOFC has a solid oxide electrolyte. Although BaCeO3 has been used as the electrolyte for its high proton conductivity, it is chemically unstable under a CO2 and H2O environment. Therefore, solid solutions Ba(Ce0.8-xZrxY0.2)O3-δ which exhibit high proton conductivity and chemical stability simultaneously have been developed. However, the thermal properties such as thermal conductivity and thermal expansion coefficient of the compound are hardly understood, even though they are important for the practical use of SOFC. Here, we synthesized polycrystalline bulk samples of Ba(Ce0.8-xZrxY0.2)O3-δ with x ranging from 0 to 0.8 and examined their thermal conductivity and thermal expansion coefficient from room temperature to 1273 K. Effect of Zr content on the crystal structure and the thermal properties of Ba(Ce0.8-xZrxY0.2)O3-δ will be discussed.