添加气相生长碳纤维对改善碳纸性能的研究

Study on Improving Properties of Carbon Paper by Adding Vapor Grown Carbon Fiber

关键词:  气相生长碳纤维（VGCF）  碳纸  燃料电池  电阻率  石墨化度

Key Words:vapor grown carbon fiber （VGCF）  carbon paper  fuel cell  resistance  graphitization degree

摘要:本研究创新性地提出将气相生长碳纤维（VGCF）添加到燃料电池用碳纸中，探究了不同分散方法对VGCF在碳纸原纸中分散效果的影响，以及添加VGCF对碳纸强度、透气性、导电性能、石墨化度的影响。结果表明，使用无水乙醇和分散剂有效分散的VGCF添加到碳纸中，可以一定程度地提高碳纸的强度和有效提高碳纸的导电性能，但会降低碳纸的透气性。当VGCF的添加量为4%时，与未添加VGCF碳纸的物理性能相比，其抗张强度增加了11.58%，水平向电阻率和透气量分别降低了30.31%和11.27%，石墨化度提高了20.39%。

Abstract:Adding vapor grown carbon fiber （VGCF） into the carbon paper for fuel cell was innovatively proposed in this study. The influence of different methods of VGCF on the dispersion effect in the original carbon paper was studied. The physical properties， air permeability， conductivity and the graphitization degree of carbon paper with different VGCF addition amounts were also investigated. The results showed that the addition of effectively dispersed VGCF with anhydrous ethanol and dispersant into original carbon paper could increase the strength to a certain extent and improve the conductivity effectively， whereas reduced the air permeability. When the amount of VGCF was 4%， compared with the physical performence of carbon paper without VGCF， the tensile strength increased by 11.58%， the horizontal resistance decreased by 30.31%， the air permeability decreased by 11.27%， and the graphitization increased by 20.39%.