Effect of CeO₂ interlayer on ZrO₂ electrolyte/La(Sr)CoO₃ cathode for low-temperature SOFCs

详细信息	查看全文 | 推荐本文 |

• 作者：Shiono ; Mitsunobu ; Kobayashi ; Kenichi ; Lan Nguyen ; Tuong ; Hosoda ; Kan ; Kato ; Toru ; Ota ; Kenichiro ; et. al.
• 关键词：Solid oxide fuel cells ; Low-temperature SOFC ; Lanthanum cobaltite ; Ceria ; Interlayer ; Fuel cell (84.60 D)
• 刊名：Solid State Ionics
• 出版年：2004
• 期刊代码：96_01672738
• 类别：ch
• 出版时间：May 14, 2004
• 卷：170
• 期：1-2
• 页码：1-7
• 文件大小：652 K

摘要

Porous Ce_0.9Gd_0.1O_2−δ (GDC) and dense Ce_0.8Sm_0.2O_2−δ (SDC) protection interlayer were introduced between Scandia-stabilized zirconia (SSZ) electrolyte and La_0.6Sr_0.4CoO_3−δ (LSC) cathode of low-temperature SOFCs which operate at 600–800 °C. The reactivity of the interlayer and the area-specific resistance (ASR) were investigated. EPMA analysis clearly showed that the reaction between LSC cathode and SSZ electrolyte did not occur even though GDC interlayer (3–6 μm) was porous. Moreover, the reaction between GDC interlayer and SSZ electrolyte which were fired at 1320 °C was not observed. The ASR of LSC/GDC/SSZ measured by an AC impedance method was reduced 40%or more at each temperature compared to LSC cathode on a GDC pellet and showed a low value in 600–800 °C. Thin and relatively dense SDC interlayer (<1 μm) was fabricated between LSC cathode and SSZ electrolyte by using 2-ethylhexanoic acid salts of Sm and Ce, and also in the system using this SDC thin interlayer, low ASR equivalent to LSC/GDC/SSZ was shown, and it became clear that the interlayer in this experiment is very effective in the reduction of ASR.