Electrochemical performance and long-term durability of a 200 W-class solid oxide regenerative fuel cell stack
Electrochemical performance and long-term durability of a 200 W-class solid oxide regenerative fuel cell stack
复制标题
DOI：
10.1016/j.ijhydene.2014.06.114
复制
发表时间：
2014-12
影响因子：
7.2
通讯作者：
Jongsup Hong;Hyojin Kim;Sun Young Park;Jin-Ho Lee;Su Byung Park;Jong-Ho Lee;Byung‐Kook Kim;Hae Joon Je;Jae Yuk Kim;K. Yoon
中科院分区：
文献类型：
--
作者：
Jongsup Hong;Hyojin Kim;Sun Young Park;Jin-Ho Lee;Su Byung Park;Jong-Ho Lee;Byung‐Kook Kim;Hae Joon Je;Jae Yuk Kim;K. Yoon
研究了200 W级固体氧化物再生燃料电池（SORFC）电堆在循环换模和长期运行条件下的电化学性能和耐久性。使用三个单元电池（10 cm × 10 cm）进行电池堆开发，每个单元电池均基于Ni -氧化钇稳定的氧化锆（YSZ）燃料电极、氧化钪稳定的氧化锆（ScSZ）电解质和Sr掺杂的LaCoO 3（LSC）-氧化钆掺杂的氧化铈（GDC）空气电极。空气电极的分层被抑制通过使用混合的离子和电子传导的空气电极，没有氧过量的非化学计量比，和气体泄漏最小化通过使用新型玻璃陶瓷复合密封剂。通过最小化欧姆和电极极化，在单电池水平上实现了优异的电化学性能，并且成功地配置了三电池堆，而没有与电接触、气体供应或密封相关的主要性能损失。在固体氧化物电解电池（SOEC）模式下，在热中性电压下稳定运行1000 h，发现固体氧化物燃料电池（SOFC）和SOEC之间的运行模式的周期性变化加速了性能退化。基于对电池微观结构的分析，详细讨论了周期性换模对电池稳定性的影响。
The electrochemical performance and durability of a 200 W-class solid oxide regenerative fuel cell (SORFC) stack are investigated for cyclic mode-changing and long-term operation. Three unit cells (10 cm × 10 cm), each based on a Ni – yttria-stabilized zirconia (YSZ) fuel electrode, a scandia-stabilized zirconia (ScSZ) electrolyte and a Sr-doped LaCoO3(LSC) – gadolinia-doped ceria (GDC) air electrode, are used for the stack development. Delamination of the air electrode is suppressed by using a mixed ionic- and electronic-conducting air electrode with no oxygen excess non-stoichiometry, and gas leakage is minimized by using novel glass-ceramic composite sealants. Excellent electrochemical performance is achieved in a single cell level by minimizing the ohmic and electrode polarizations, and the three-cell stack is successfully configured without major performance loss associated with electrical contacts, gas supply or sealing. Stable operation is confirmed at a thermal neutral voltage for 1000 h in the solid oxide electrolysis cell (SOEC) mode, and the periodic change of the operation mode between the solid oxide fuel cell (SOFC) and SOEC is found to accelerate the performance degradation. The effect of cyclic mode-changing on the stability of the SORFC stacks is discussed in detail based on the observations from the post-mortem microstructural analysis.