Co/Fe oxide and Ce_(0.8)Gd_(0.2)O_(2-δ) composite interlayer for solid oxide electrolysis cell

作     者：Jingbo Yan Lei Shang Zhe Zhao Dingrong Ou Mojie Cheng 

作者机构：Division of Fuel Cells Dalian National Laboratory for Clean Energy Dalian Institute of Chemical Physics Chinese Academy of Sciences University of Chinese Academy of Sciences 

出 版 物：《Journal of Energy Chemistry》 (能源化学（英文版）)

年 卷 期：2016年第25卷第5期

页      面：840-844页

核心收录：

学科分类：0808[工学-电气工程] 08[工学] 

基　　金：supported by the National Natural Science Foundation of China (Nos. 21506208, 21476230 and 21376238) DICP DMTO201405 

主　　题：Solid oxide electrolysis cell Ceria interlayer Cobalt oxide Sr segregation 

摘      要：A composite interlayer comprised of gadolinia doped ceria（GDC） and Co/Fe oxide was prepared and investigated for solid oxide electrolysis cell with yttrium stabilized zirconia（YSZ） electrolyte and LaSrCoFeO（LSCF） anode. The interlayer was constructed of a base layer of GDC and a top layer of discrete CoO/FeCoOparticles. The presence of the GDC layer drastically alleviated the undesired reactions between LSCF and YSZ, and the presence of Co/Fe oxide led to further performance improvement. At 800 °C and 45% humidity, the cell with 70% Co/Fe-GDC interlayer achieved 0.98 A/cmat 1.18 V, 14% higher than the cell without Co/Fe oxide. Electrochemical impedance spectroscopy（EIS） revealed that with higher Co/Fe content, both the ohmic resistance and the polarization resistance of the cell were reduced. It is suggested that Co/Fe oxide can react with the Sr species segregated from LSCF and Sr（Co,Fe）O, a compound with high catalytic activity and electronic conductivity. The Sr-capturing ability of Co/Fe oxide in combination with the Sr-blocking ability of GDC layer can effectively suppress the undesired reaction between LSCF and YSZ, and consequently improve the cell performance.