摘要
为提高质子交换膜燃料电池用超薄炭纸的力学性能,采用电化学聚合法在高通量超薄炭纸(0.339 g·cm^(-3),0.13 mm)内部原位聚合聚噻吩薄膜,制备聚噻吩薄膜改性超薄炭纸(PTCP)。通过红外光谱仪(FT-IR)和扫描电镜(SEM-EDS)分析表征了PTCP的结构和形貌特征,并对其物理性能和其作为气体扩散层的质子交换膜燃料电池的电池性能进行测试。结果显示,所制备的聚噻吩薄膜包覆在炭纤维、基体炭-炭纤维节点上,在炭纸内部形成厚度均匀的薄膜网络,且厚度随聚合电流增大仅从119 nm增厚至574 nm,使PTCP保留了高通量超薄炭纸的孔隙结构;这种包覆型薄膜网络结构能有效提高炭纸的力学性能。PTCP相比同密度普通超薄炭纸(CP1)具有更好的力学性能和透气性,聚噻吩薄膜厚度约为422 nm时,PTCP拉伸强度(39.63MPa)比CP1高出45%,透气率(2 959 m L·mm·cm^(-2)·h^(-1)·mm Aq)比CP1高出13.2%,PTCP所制备的质子交换膜燃料电池最高功率密度(728 m W·cm^(-2))较CP1高出25.3%。
In this study, polythiophene film was in-situ deposited on the high flux, ultrathin carbon fiber paper （0.339 g·cm-3, 0.13 mm） used for proton-exchange membrane fuel cell by electrochemical polymerization to improve the mechanical property, and the carbon fiber papers modified by PTh film （PTCPs） were prepared. The structure and morphology of PTCPs were characterized by Fourier transform infrared spectroscopy （FT-IR） and scanning electron microscopy （SEM-EDS）, and the physical properties of PTCPs and performance of proton-exchange membrane fuel cell using PTCPs as gas diffusion layers were also characterized. The results showed that the PTh film coated on the surface of carbon fibers and carbon matrix, forming a film net which can reserve the pore structure in high flux ultrathin carbon paper and improve the mechanical property of carbon paper, and the thickness of PTh film in- creased from 119 nm to 574 nm with the increase of electrodeposition current. Meanwhile, PTCP with the film net has better me- chanical property and gas permeability than ordinary ultrathin carbon fiber paper （CP1） with the same density of PTCP. When the thickness of polythiophene film is 422 nm, the tensile strength of PTCP （39.63 MPa） was 45% higher than that of CP1, and the gas permeability of PTCP （2 959 mL·mm·cm-2·h-1 .mmAq） was 13.2% higher than that of CP1. The highest power density of proton-ex- change membrane fuel cell using PTCPs as gas diffusion layers was 25.3% higher than that of CP1.
出处
《炭素技术》
北大核心
2017年第5期29-34,44,共7页
Carbon Techniques
基金
国家重点研发计划子课题超薄炭纸研发(2016YFB0101205)
关键词
超薄炭纸
聚噻吩薄膜
力学性能
原位电化学聚合
Ultrathin carbon fiber paper
polythiophene film
mechanical property
in-situ electrochemical polymerization
