Study on the Influence of GDL Porosity Distribution Variation on PEMFC Performance Under Assembly Pressure

IF 2.6 4区 工程技术 Q3 ELECTROCHEMISTRY
Fuel Cells Pub Date : 2024-08-08 DOI:10.1002/fuce.202400102
Yifei Cao, Yanfeng Xing, Juyong Cao, Xiaobing Zhang, Linfa Peng
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引用次数: 0

Abstract

The porosity of the gas diffusion layer (GDL) significantly impacts the performance of proton exchange membrane fuel cells (PEMFCs). Assembly pressure in PEMFCs leads to GDL deformation and alterations in porosity distribution. This study integrated a three-dimensional (3D) GDL deformation model with a 3D two-phase PEMFC model, employing a four-term Fourier series model to optimize the fitting of the GDL porosity distribution curve. The approach quantitatively assessed the impact of GDL porosity distribution under assembly pressure on PEMFC performance. Results reveal an arched porosity distribution in GDL, peaking in the middle of low channels adjacent to ribs. High porosity enhances oxygen and heat conduction but excessive porosity may cause uneven current density distribution, hindering GDL drainage. Furthermore, the analysis compares performances at various GDL compression ratios and thicknesses, showing an initial rise then fall in current density with increasing pressure. This represents a trade-off between the adverse impact of GDL compression on mass transfer losses and the favorable impact of reduced ohmic losses. At the optimal pressure, the current density is 3% higher than neighboring values at the same potential, and within the optimal GDL thickness range, the current density error remains below 1%.

组装压力下 GDL 孔隙率分布变化对 PEMFC 性能的影响研究
气体扩散层(GDL)的孔隙率对质子交换膜燃料电池(PEMFC)的性能有很大影响。PEMFC 中的组装压力会导致 GDL 变形和孔隙率分布的改变。本研究将三维 (3D) GDL 变形模型与三维两相 PEMFC 模型相结合,采用四项傅里叶级数模型来优化 GDL 孔隙率分布曲线的拟合。该方法定量评估了装配压力下 GDL 孔隙率分布对 PEMFC 性能的影响。结果显示,GDL 中的孔隙率分布呈弧形,在靠近肋条的低通道中间达到峰值。高孔隙率可增强氧气和热量的传导,但过高的孔隙率可能会导致电流密度分布不均,从而阻碍 GDL 的排水。此外,分析还比较了不同 GDL 压缩比和厚度下的性能,结果表明随着压力的增加,电流密度先上升后下降。这体现了 GDL 压缩对传质损耗的不利影响与欧姆损耗减少的有利影响之间的权衡。在最佳压力下,电流密度比相同电位下的邻近值高 3%,而在最佳 GDL 厚度范围内,电流密度误差保持在 1%以下。
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来源期刊
Fuel Cells
Fuel Cells 工程技术-电化学
CiteScore
5.80
自引率
3.60%
发文量
31
审稿时长
3.7 months
期刊介绍: This journal is only available online from 2011 onwards. Fuel Cells — From Fundamentals to Systems publishes on all aspects of fuel cells, ranging from their molecular basis to their applications in systems such as power plants, road vehicles and power sources in portables. Fuel Cells is a platform for scientific exchange in a diverse interdisciplinary field. All related work in -chemistry- materials science- physics- chemical engineering- electrical engineering- mechanical engineering- is included. Fuel Cells—From Fundamentals to Systems has an International Editorial Board and Editorial Advisory Board, with each Editor being a renowned expert representing a key discipline in the field from either a distinguished academic institution or one of the globally leading companies. Fuel Cells—From Fundamentals to Systems is designed to meet the needs of scientists and engineers who are actively working in the field. Until now, information on materials, stack technology and system approaches has been dispersed over a number of traditional scientific journals dedicated to classical disciplines such as electrochemistry, materials science or power technology. Fuel Cells—From Fundamentals to Systems concentrates on the publication of peer-reviewed original research papers and reviews.
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