能源化学(英文) ›› 2016, Vol. 25 ›› Issue (5): 840-844.DOI: 10.1016/j.jechem.2016.05.002

• ARTICLES • 上一篇    下一篇

Co/Fe oxide and Ce0.8Gd0.2O2-δ composite interlayer for solid oxide electrolysis cell

Jingbo Yan1,2, Lei Shang1,2, Zhe Zhao1, Dingrong Ou1, Mojie Cheng1   

  1. a Division of Fuel Cells, Dalian National Laboratory for Clean Energy, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, Liaoning, China;
    b University of Chinese Academy of Sciences, Beijing 100049, China
  • 收稿日期:2016-03-07 修回日期:2016-04-17 出版日期:2016-09-15 发布日期:2016-09-30
  • 通讯作者: Mojie Cheng
  • 基金资助:

    This work was supported by the National Natural Science Foundation of China (Nos. 21506208, 21476230 and 21376238) and DICP DMTO201405.

Co/Fe oxide and Ce0.8Gd0.2O2-δ composite interlayer for solid oxide electrolysis cell

Jingbo Yan1,2, Lei Shang1,2, Zhe Zhao1, Dingrong Ou1, Mojie Cheng1   

  1. a Division of Fuel Cells, Dalian National Laboratory for Clean Energy, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, Liaoning, China;
    b University of Chinese Academy of Sciences, Beijing 100049, China
  • Received:2016-03-07 Revised:2016-04-17 Online:2016-09-15 Published:2016-09-30
  • Contact: Mojie Cheng
  • Supported by:

    This work was supported by the National Natural Science Foundation of China (Nos. 21506208, 21476230 and 21376238) and DICP DMTO201405.

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 La0.6Sr0.4Co0.2Fe0.8O3-δ (LSCF) anode. The interlayer was constructed of a base layer of GDC and a top layer of discrete Co3O4/FeCo2O4 particles. 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 ℃ and 45% humidity, the cell with 70% Co/Fe-GDC interlayer achieved 0.98 A/cm2 at 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 Sr1-x (Co,Fe)O3-δ, 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.

关键词: Solid oxide electrolysis cell, Ceria interlayer, Cobalt oxide, Sr segregation

Abstract: 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 La0.6Sr0.4Co0.2Fe0.8O3-δ (LSCF) anode. The interlayer was constructed of a base layer of GDC and a top layer of discrete Co3O4/FeCo2O4 particles. 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 ℃ and 45% humidity, the cell with 70% Co/Fe-GDC interlayer achieved 0.98 A/cm2 at 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 Sr1-x (Co,Fe)O3-δ, 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.

Key words: Solid oxide electrolysis cell, Ceria interlayer, Cobalt oxide, Sr segregation