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Thermal stress analysis at the interface of cathode and electrolyte in solid oxide fuel cells
International Communications in Heat and Mass Transfer ( IF 7 ) Pub Date : 2020-11-01 , DOI: 10.1016/j.icheatmasstransfer.2020.104831
Xiaoqiang Zhang , Siqi Yu , Minkang Wang , Shuyue Dong , Joseph Parbey , Tingshuai Li , Martin Andersson

Abstract A benign thermal stress in solid oxide fuel cell is of great importance for its stability and the interfaces between different components suffer from unexpected risks of instability such as electrode delamination and crack due to varying thermal expansion coefficients. Besides, chromium poisoning cathode materials leads to phase changes, which possibly induces thermal stresses at the interface of electrolyte and cathode. A three dimensional model at the microscale level is thus developed to unravel the effect of thermal stress on the interface. The model is constructed by governing equations including heat, species, momentum, ion and electronic transportation. The contact modes between the active cathode and electrolyte are studied to reveal the cell performance and thermal stresses, which are strongly related to the number of contact sites and the contact area. Moreover, chromium poisoning the contact causes the disordered distribution of thermal stresses with the increase of the contact sites, worsening the cell current density and durability. The resulting conclusions are expected to offer a solution to avoid possible fatal mechanical failure due to unfavorable interface design and chromium attack.

中文翻译:

固体氧化物燃料电池阴极与电解质界面热应力分析

摘要 固体氧化物燃料电池中的良性热应力对其稳定性非常重要,不同组件之间的界面会因热膨胀系数变化而遭受意想不到的不稳定风险,例如电极分层和裂纹。此外,铬中毒正极材料会导致相变,这可能会在电解质和正极界面处引起热应力。因此开发了一个微观尺度的三维模型来揭示热应力对界面的影响。该模型由控制方程构成,包括热量、物种、动量、离子和电子传输。研究了活性阴极和电解质之间的接触模式,以揭示电池性能和热应力,这与接触点的数量和接触面积密切相关。此外,铬中毒接触会导致热应力随着接触点的增加而无序分布,从而使电池电流密度和耐用性变差。预计由此产生的结论将提供一种解决方案,以避免由于不利的界面设计和铬侵蚀而可能导致的致命机械故障。
更新日期:2020-11-01
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