Wang Yu, Song Ming
College of Transportation, Shandong University of Science and Technology, Qingdao 266555, China.
Department of Engineering Mechanics, College of Pipeline and Civil Engineering, China University of Petroleum (East China), Qingdao 266555, China.
Materials (Basel). 2024 Jul 2;17(13):3257. doi: 10.3390/ma17133257.
For Ni-YSZ anode-supported solid oxide fuel cells (SOFCs), the main drawback is that they are susceptible to reducing and oxidizing atmosphere changes because of the Ni/NiO volume variation. The anode expansion upon oxidation can cause significant stresses in the cell, eventually leading to failure. In order to improve the redox stability, an analytical model is developed to study the effect of anode structure on redox stability. Compared with the SOFC without AFL, the tensile stresses in the electrolyte and cathode of SOFC with an anode functional layer (AFL) after anode oxidation are increased by 27.07% and 20.77%, respectively. The thickness of the anode structure has a great influence on the structure's stability. Therefore, the influence of anode thickness and AFL thickness on the stress in these two structures after oxidation is also discussed. The thickness of the anode substrate plays a more important role in the SOFC without AFL than in the SOFC with AFL. By increasing the thickness of the anode substrate, the stresses in the electrolyte and cathode decrease. This method provides a theoretical basis for the design of a reliable SOFC in the redox condition and will be more reliable with more experimental proofs in the future.
对于镍钇稳定氧化锆（Ni-YSZ）阳极支撑的固体氧化物燃料电池（SOFC），主要缺点是由于Ni/NiO体积变化，它们易受还原和氧化气氛变化的影响。阳极在氧化时的膨胀会在电池中引起显著应力，最终导致失效。为了提高氧化还原稳定性，开发了一个分析模型来研究阳极结构对氧化还原稳定性的影响。与没有阳极功能层（AFL）的SOFC相比，有AFL的SOFC在阳极氧化后，电解质和阴极中的拉应力分别增加了27.07%和20.77%。阳极结构的厚度对结构稳定性有很大影响。因此，还讨论了阳极厚度和AFL厚度对这两种结构氧化后应力的影响。阳极基板厚度在没有AFL的SOFC中比在有AFL的SOFC中起更重要的作用。通过增加阳极基板的厚度，电解质和阴极中的应力会降低。该方法为在氧化还原条件下设计可靠的SOFC提供了理论基础，未来通过更多实验验证将更加可靠。
