Degradation factors in (La,Sr)(Co,Fe)O3-delta cathode/Sm2O3-CeO2 interlayer/Y2O3-ZrO2 electrolyte system during operation of solid oxide fuel cells

作者：Matsui Toshiaki; Komoto Masahiro; Muroyama Hiroki; Kishida Kyosuke; Inui Haruyuki; Eguchi Koichi

来源：Journal of Power Sources, 2016, 312: 80-85.

DOI：10.1016/j.jpowsour.2016.02.052

• Solid oxide fuel cells
• Doped ceria interlayer
• SrZrO3
• Microstructural change
• Discharge operation

In this study, the miscrostructural change of the LSCF/SDC/YSZ system upon discharge was analyzed quantitatively by the focused ion beam-scanning electron microscopy as well as the transmission electron microscopy. It is widely recognized that the formation of highly-resistive SrZrO3 phase degrades the cell performance in this system. In fact, the ohmic loss and cathodic overpotential increased in response to the six-fold increase in the volume of SrZrO3 phase after 400 h of discharge at 1000 degrees C. However, the microstructural change proceeded in the whole part of this system, indicating that various degradation factors need to be considered; e.g., 1) the agglomeration of SDC and LSCF phases, 2) the reduction in triple phase boundary length, and 3) the formation of ceria-zirconia solid solution.

• 出版日期2016-4-30