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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 order to improve the mechanical properties of ultrathin carbon paper for proton exchange membrane fuel cell, the polythiophene film was in situ polymerized by electrochemical polymerization in high-throughput ultra-thin carbon paper (0.339 g · cm -3, 0.13 mm) , To prepare polythiophene film modified ultra-thin carbon paper (PTCP). The structure and morphology of PTCP were characterized by FT-IR and SEM-EDS. The physical properties and the properties of PTCP fuel cell as gas diffusion layer were tested. The results show that the prepared polythiophene film is coated on the carbon fiber and the matrix carbon-carbon fiber node to form a thin film network with uniform thickness inside the carbon paper, and the thickness increases only from 119 nm to 574 nm with the increase of the polymerization current , PTCP retained the porous structure of high-throughput ultra-thin carbon paper; this coated film network structure can effectively improve the mechanical properties of carbon paper. PTCP has better mechanical properties and breathability than CP1 with the same density. When the thickness of polythiophene film is about 422 nm, PTCP tensile strength (39.63 MPa) is 45% higher than that of CP1, and the air permeability (2 959 m L · mm · cm -2 · h -1 · mm Aq) was 13.2% higher than that of CP1. The maximum power density of the proton exchange membrane fuel cell prepared by PTCP (728 mW · cm ~ (-2)) is 25.3% higher than CP1.