Heterogeneous pore-scale model analysis of micro-patterned PEMFC cathodes
Heterogeneous pore-scale model analysis of micro-patterned PEMFC cathodes
复制标题
微图案质子交换膜燃料电池阴极的异质孔尺度模型分析
DOI：
10.1016/j.jpowsour.2022.232507
复制
发表时间：
2023
影响因子：
9.2
通讯作者：
Nakao Masayuki
中科院分区：
文献类型：
--
作者：
Tomizawa Morio;Inoue Gen;Nagato Keisuke;Tanaka Akihisa;Park Kayoung;Nakao Masayuki
聚合物电解质膜燃料电池（PEMFC）是未来氢基社会的一个关键特征。电解质膜的表面图案化方法已被提出作为PEMFC的性能改进技术。然而，由于复杂的物质传递和化学反应现象，其潜在的机制尚不清楚。在这项研究中，质子交换膜燃料电池阴极的表面图案化模拟使用一个独特的模拟方法的非均匀孔隙尺度模型。通过计算结果与实验测量结果的比较，验证了模拟的有效性。该模型随后被应用于调查的图案方面，铂负载，和离聚物量的变化，并进行先进的支柱结构分析。一系列数值模拟表明，表面图案化的性能改善是基于通过催化剂层的质子传导的改善，这是由于通过曲折离聚物的路径缩短所致。另外，表面图案化通过减少离聚物的量并利用改进的质子传导性而潜在地促进氧扩散。
Polymer electrolyte membrane fuel cells (PEMFCs) are a key feature of future hydrogen-based societies. The surface-patterning method for electrolyte membranes has been proposed as a performance improvement technique for PEMFCs. However, its underlying mechanism remains unclear because of complicated mass transport and chemical reaction phenomena. In this study, the surface patterning of a PEMFC cathode was simulated using a unique simulation method of a heterogeneous pore-scale model. The simulation was validated by a comparison of the calculated results with experimental measurements. The model was subsequently applied to investigate variations in the pattern aspect, Pt loading, and ionomer amount and to conduct an advanced pillar structural analysis. A series of numerical simulations suggested that the performance improvement from surface patterning is based on improved proton conduction through the catalyst layer resulting from shortened paths through a tortuous ionomer. Additionally, surface patterning potentially promotes oxygen diffusion by reducing the amount of ionomer and taking advantage of improved proton conduction.