SOECのCO₂電気分解におけるカソード酸化挙動のオペランドX線解析

抄録

CO₂ electrolysis in solid oxide electrolysis cells (SOECs) has attracted much attention. However, there is a problem that CO₂ oxidizes Ni, which serves as a catalyst, resulting in degradation of cell performance. In this study, the cathode surface was analyzed by XAFS. We performed XAFS analysis of electrode surface under actual CO₂ environment to reveal the oxidation mechanism. The experiment in the non-electrolysis mode showed Ni was oxidized in the cathode within 10 minutes in a pure CO₂ atmosphere at about 650°C.