摘要
本研究系统探究了不同比例(0、5%、10%、25%、50%)沥青基碳纤维掺杂对聚丙烯腈(PAN)基碳纸性能的影响。通过扫描电镜、拉伸强度测试、面内电阻率测试、透气性测试、孔径分布分析、极化曲线、功率密度测试和电化学阻抗谱(EIS)等方法,对碳纸的微观结构、力学、电学、气体传输和电化学性能进行了全面表征。结果表明,沥青基碳纤维的掺杂显著降低了碳纸的面内电阻率,从未掺杂时的7.2 mΩ·cm降至50%掺杂量时的2.0 mΩ·cm。拉伸强度随掺杂比例的变化呈现先升高后降低的趋势,在10%掺杂量时达到峰值18.5 MPa,较未掺杂时提升了约176%。透气性随掺杂比例的增加呈现先降低后升高的趋势,且孔径分布也随之变化。膜电极和单电池测试结果显示,5%沥青基碳纤维掺杂的碳纸表现出最佳的电化学性能,包括更低的电化学阻抗和更高的功率密度,这主要归因于其优异的水气管理能力。本研究结果揭示了沥青基碳纤维掺杂对PAN基碳纸性能的调控规律,为燃料电池气体扩散层的优化设计提供了参考。
The impact of doping different proportions(0,5%,10%,25%,and 50%)of pitch-based carbon fiber on the properties of polyacrylonitrile(PAN)-based carbon paper is implored in this study.The microstructure,mechanical,electrical,gas transport,and electrochemical properties of the carbon paper are systematically characterized using scanning electron microscopy(SEM),tensile strength measurements,in-plane resistivity measurements,air permeability tests,pore size distribution analysis,polarization curves,power density measurements,and electrochemical impedance spectroscopy(EIS).The results show that doping pitch-based carbon fiber can significantly reduce the in-plane resistivity of the carbon paper,decreasing from 7.2 mΩ·cm to 2.0 mΩ·cm at a doping ratio of 50%.The tensile strength exhibits a trend of increasing followed by decreasing with increasing doping ratio,reaching the peak of 18.5 MPa at a 10%doping ratio,an approximately 176%increase compared to the undoped sample.The air permeability shows a trend of decreasing followed by increasing with increasing doping ratio,and the pore size distribution changes accordingly.Membrane electrode assembly(MEA)and single-cell tests indicate that the carbon paper doped with 5%pitch-based carbon fiber exhibits the best electrochemical performance,including lower electrochemical impedance and higher power density,attributed to its excellent water management capability.The findings reveal the regulatory effect of pitch-based carbon fiber doping on the properties of PAN-based carbon paper,providing a reference for optimizing the performance of gas diffusion layers of fuel cells.
作者
昌志龙
陈辉
陶金
曹维宇
沈志刚
Chang Zhilong;Chen Hui;Tao Jin;Cao Weiyu;Shen Zhigang(Beijing University of Chemical Technology,The Key Laboratory of Education Ministry on Carbon Fiber and Functional Polymer,Beijing 100029;SINOPEC Shanghai Research Institute of Petrochemical Technology Co.,Ltd.,Shanghai 201208)
出处
《汽车工程》
北大核心
2025年第8期1627-1633,共7页
Automotive Engineering
关键词
碳纸
聚丙烯腈碳纤维
沥青基碳纤维
面内电阻率
拉伸强度
透气性
功率密度
carbon paper
polyacrylonitrile carbon fiber
pitch-based carbon fiber
in-plane resistivity
tensile strength
air permeability
power density
