直接膜沉积制备高性能增强型质子交换膜燃料电池膜电极  

Reinforced high-performance membrane electrode assembly for proton exchange membrane fuel cell prepared via direct membrane deposition

作　　者：李雪 张虹[1] 林程[1] 王树博[2] 谢晓峰[2] LI Xue;ZHANG Hong;LIN Cheng;WANG Shubo;XIE Xiaofeng(School of Mechanical Engineering,Beijing Institute of Technology,Beijing 100081,China;Institute of Nuclear and New Energy Technology,Tsinghua University,Beijing 100084,China)

机构地区：[1]北京理工大学机械与车辆学院,北京100081 [2]清华大学核能与新能源技术研究院,北京100084

出　　处：《清华大学学报（自然科学版）》2021年第10期1039-1045,共7页Journal of Tsinghua University(Science and Technology)

基　　金：国家重点研发计划(2017YFB0103001);国家自然科学基金项目(51975049)。

摘　　要：质子交换膜燃料电池膜电极的性能直接决定燃料电池的输出性能,超薄质子交换膜的使用可以有效提升燃料电池峰值功率。该文将静电纺丝与直接膜沉积技术相结合,制备聚芳醚砜材料并纺丝成为纳米纤维覆于气体扩散电极上,作为薄膜增强层,再以商业全氟磺酸树脂分散液直接沉积成膜制得阴极和阳极。复合薄层膜厚度约为13μm,氢空电池的峰值功率密度为1.18 W/cm^(2),与厚度相近的商业Nafion■ NC700膜的峰值功率密度0.96 W/cm^(2)相比,提高了23%。通过对膜电极进行综合优化,在氢氧条件下电池峰值功率密度可达3.55 W/cm^(2),且阴极湿度降低对电池影响不大。利用聚芳醚砜纳米纤维作为增强层制备超薄膜电极具有优异性能,在低湿度条件下亦有高性能输出,具有广泛应用前景。The performance of proton exchange membrane fuel cells is directly related to the properties of the membrane electrode assembly which can be significantly improved by ultra-thin proton exchange membranes. In this study, electrospinning and direct membrane deposition were used to prepare poly(arylene ether sulfone) nanofiber reinforced proton exchange membranes. The resulting composite membrane was very thin, about 13 μm. The fuel cell peak power density with H2/air with this membrane of 1.18 W/cm^(2) was 23% higher than with a commercial membrane of similar thickness(Nafion■ NC700-CCM), 0.96 W/cm^(2). By optimizing the catalyst ink composition and using gas diffusion layer with better hydrophobicity, the fuel cell peak power density increased to 3.55 W/cm^(2) for H2/O2. The relative humidity at the cathode had little influence on the fuel cell performance. Hence, the membrane electrode assembly reinforced with a poly(arylene ether sulfone) nanofiber layer provides excellent fuel cell performance, even with low humidities for fuel cell applications.

关 键 词：质子交换膜燃料电池(PEMFC) 直接膜沉积 纳米纤维 增强层 

分 类 号：TK91[动力工程及工程热物理]