电化学（中英文）2025，Vol.31Issue(5)：37-61,25.DOI:10.61558/2993-074X.3546
介孔碳质子交换膜燃料电池结构与传输阻力仿真分析
Understanding the Morphology and Mass Transport Resistance of Mesoporous Carbon-Supported PEMFC Based on Modeling Analysis
摘要
Abstract
Mesoporous carbon supports mitigate platinum(Pt)sulfonic poisoning through nanopore-confined Pt deposition,yet their morphological impacts on oxygen transport remain unclear.This study integrates carbon support morphology sim-ulation with an enhanced agglomerate model to establish a mathematical framework elucidating pore evolution,Pt utili-zation,and oxygen transport in catalyst layers.Results demonstrate dominant local mass transport resistance governed by three factors:(1)active site density dictating oxygen flux;(2)ionomer film thickness defining shortest transport path;(3)ionomer-to-Pt surface area ratio modulating practical pathway length.At low ionomer-to-carbon(I/C)ratios,limited active sites elevate resistance(Factor 1 dominant).Higher I/C ratios improve the ionomer coverage but eventually thicken ionomer films,degrading transport(Factors 2-3 dominant).The results indicate that larger carbon particles result in a net increase in local transport resistance by reducing external surface area and increasing ionomer thickness.As the proportion of Pt situated in nanopores or the Pt mass fraction increases,elevated Pt density inside the nanopores exacerbates pore blockage.This leads to the increased transport resistance by reducing active sites,and increasing ionomer thickness and surface area.Lower Pt loading linearly intensifies oxygen flux resistance.The model underscores the necessity to optimize support morphology,Pt distribution,and ionomer content to prevent pore blockage while balancing catalytic activity and transport efficiency.These insights provide a systematic approach for designing high-performance mesoporous carbon catalysts.关键词
介孔碳载体/电化学活性面积/铂覆盖率/氧传输阻力/孔体积分布Key words
Mesoporous carbon support/Electrochemical active surface area/Platinum coverage/Oxygen transport resistance/Pore volume distribution引用本文复制引用
邓豪,刘佳,侯中军..介孔碳质子交换膜燃料电池结构与传输阻力仿真分析[J].电化学（中英文）,2025,31(5):37-61,25.基金项目
This research was financially supported by the Program of Ministry of Science and Technology of China(No.2023YFB2504200).The authors are also grateful to the support of Shanghai Rising-Star Program(Grant No.24QB2703200)and the Major Science and Technology Projects of Yunnan Province(No.202302AH360001). （No.2023YFB2504200）
