A study of solid oxide fuel cell stack failure by inducing abnormal behavior in a single cell test
A study of solid oxide fuel cell stack failure by inducing abnormal behavior in a single cell test
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DOI：
10.1016/j.jpowsour.2008.07.051
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发表时间：
2008-12-01
影响因子：
9.2
通讯作者：
Virkar, Anil V.
中科院分区：
文献类型：
--
作者：
Lim, Hyung-Tae;Virkar, Anil V.
众所周知，电池不平衡会导致电池失效。先前的理论模型表明，由于电池不平衡，固体氧化物燃料电池（SOFC）电池组也可能发生类似的故障。SOFC堆失效模型的核心是电池电压变为负值时电池的异常运行。为了研究SOFC堆叠故障，通过模拟单电池测试中的异常行为，在800摄氏度的温度下，以氢为燃料，空气为氧化剂，在施加和不施加直流偏压的情况下，对氧化钇稳定氧化锆（YSZ）薄电解质阳极支撑电池进行了测试。当在直流偏置下，电池在负电压下工作时，以电池电阻增加为特征的快速降解发生。目视和显微镜检查显示，沿电解质/阳极界面发生分层。目前的研究结果表明，在电池不平衡的情况下，YSZ电解质的阳极支持SOFC堆栈容易由于内部压力积聚而发生灾难性失效。目前的结果还表明，SOFC堆栈中的细胞数量越多，发生灾难性故障的倾向就越大。(C) 2008 Elsevier B.V.版权所有
It is well known that cell imbalance can lead to failure of batteries. Prior theoretical modeling has shown that similar failure can occur in solid oxide fuel cell (SOFC) stacks due to cell imbalance. Central to failure model for SOFC stacks is the abnormal operation of a cell with cell voltage becoming negative. For investigation of SOFC stack failure by simulating abnormal behavior in a single cell test, thin yttria-stabilized zirconia (YSZ) electrolyte, anode-supported cells were tested at 800 degrees C with hydrogen as fuel and air as oxidant with and without an applied DC bias. When under a DC bias with cell operating under a negative voltage, rapid degradation occurred characterized by increased cell resistance. Visual and microscopic examination revealed that delamination occurred along the electrolyte/anode interface. The present results show that anode-supported SOFC stacks with YSZ electrolyte are prone to catastrophic failure due to internal pressure buildup, provided cell imbalance occurs. The present results also suggest that the greater the number of cells in an SOFC stack, the greater is the propensity to catastrophic failure. (C) 2008 Elsevier B.V. All rights reserved.