Improving Gas Diffusion in Solid Oxide Cells Through Laser-Ablated Electrode Supports
Improving Gas Diffusion in Solid Oxide Cells Through Laser-Ablated Electrode Supports
复制标题
通过激光烧蚀电极支架改善固体氧化物电池中的气体扩散
DOI：
10.1149/11106.0915ecst
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发表时间：
2023
期刊：
影响因子：
--
通讯作者：
Barnett, Scott A
中科院分区：
文献类型：
--
作者：
Ganti-Agrawal, Saahir;Cox, Dalton;Barnett, Scott A
在Ni-YSZ电极支持电池中，气体通过电极支持层的扩散可能是高H2或H2O利用率和高温下的主要限制因素。通常，使用高孔隙率的电极支架来改善扩散，但这会降低电池的结构完整性。冷冻铸造和3d打印等替代制造方法允许在细胞表面创建分层结构，从而改善气体扩散，但这些方法需要重新设计加工程序以获得所需的材料特性。这项工作在烧结后使用激光烧蚀在电极支架上刻划切口，无需重新设计整个制造过程，即可实现新颖的结构。对对称Ni-YSZ电极支持电池的电流-电压测量表明，激光图像化可将极限电流密度和有效扩散率提高30%。有图案和没有图案的细胞的力学测试表明，有图案的细胞遭受相对较小的断裂强度降低。
In Ni-YSZ electrode-supported cells, gas diffusion through the electrode support layer can be a major limitation at high H2 or H2O utilization and high temperature. Conventionally, higher-porosity electrode supports are used to improve diffusion, but this diminishes the cell’s structural integrity. Alternative fabrication methods like freeze-casting and 3D-printing allow for the creation of hierarchical structures with cutouts in the cell surface that improve gas diffusion, but these methods require redesigning processing procedures to obtain the desired materials properties. This work uses laser ablation to pattern cutouts into the electrode support after sintering, enabling a novel structure without redesigning the entire fabrication process. Current-voltage measurements of symmetric Ni-YSZ electrode-supported cells with one patterned and one un-patterned electrode demonstrate that laser-patterning improves limiting current density and effective diffusivity by as much as 30%. Mechanical testing of patterned and un-patterned cells demonstrates that patterned cells suffer relatively small reductions in fracture strength.