梯级多孔电极内液态水的传输机理研究  

Study on the Mechanism of Liquid Water Transport Within Graded Porous Electrodes

作　　者：江涛 牟新竹 陈振乾[1] JIANG Tao;MOU Xinzhu;CHEN Zhenqian(School of Energy and Environment,Southeast University,Nanjing 210096,China;School of Astronautics,Nanjing University of Aeronautics and Astronautics,Nanjing 210016,China)

机构地区：[1]东南大学能源与环境学院,南京210096 [2]南京航空航天大学航天学院,南京210016

出　　处：《工程热物理学报》2025年第3期954-960,共7页Journal of Engineering Thermophysics

基　　金：国家自然科学基金项目(No.52076040)。

摘　　要：电极结构对质子交换膜燃料电池(PEMFC)系统中的传质过程具有重要影响。本研究重建了有序梯级多孔微孔层(MPL)和随机生成气体扩散层(GDL),形成了MPL的梯级介孔和均匀微孔气液分离通道。基于格子玻尔兹曼方法(LBM),Shan-Chen多组分多相伪势模型被用于有序梯级多孔结构中液态水的传输机制研究。随后,本文研究了不同工作条件下GDL中液态水的饱和度和MPL中的气体含量。结果表明,有序正梯度多孔结构可以有效地去除液态水并在适当的驱动压差和流速下保留更多的反应气体,而润湿性梯度设计难以平衡水去除效率和气体保留。因此,通过优化工作条件,有序正梯度MPL可以有效地优化PEMFC中的液态水循环,并提高PEMFC的电化学性能。The electrode structure plays a vital role in mass transfer processes within Proton Ex-change Membrane Fuel Cell(PEMFC)systems.This study involved the reconstruction of an or-derly graded porous micro-porous layer(MPL)and stochastic gas diffusion layers(GDLs),giving rise to a graded mesoporous structure and uniform microporous gas-liquid separation channels in the MPL.Leveraging the Lattice Boltzmann Method(LBM),the Shan-Chen multiphase pseudo-potential model was employed to investigate the mechanisms of liquid water transport within the orderly graded porous architecture.Subsequently,the liquid water saturation in the GDL and gas content in the MPL under various operating conditions were examined.The findings revealed that an ordered positive gradient porous structure can efficiently remove liquid water while retaining more reaction gases at appropriate driving pressure differences and flow rates.Conversely,wetting gradient designs struggle to strike a balance between water removal efficiency and gas retention.Con-sequently,by optimizing operational conditions,an ordered positive gradient MPL can significantly enhance liquid water management in PEMFCs,thereby boosting their electrochemical performance.

关 键 词：有序梯级多孔 微孔层 格子玻尔兹曼方法 水输运 饱和度 

分 类 号：TK91[动力工程及工程热物理]