用于PEMFC的气体扩散层开发应用研究

A Study on Gas Diffusion Layer for PEMFC

燃料电池研发必须考虑温度、湿度及启动等因素。研究了一种基于疏水梯度易于操作在低湿环境的气体扩散层材料,结果表明制备的多层微孔层厚度在260~270μm,气体渗透约为145 s。经电池极化测试,样品可在50%相对湿度环境使电池维持在477 mW/cm^(2)的功率输出,相比100%的湿度环境仅衰减23%;利用SiO_(2)的亲水性,添加5%wt SiO_(2)可进一步拓展电池湿度应用范围,使应用于40%相对湿度极端低湿环境的电池具有428 mW/cm 2的功率输出,相比100%的湿度环境仅衰减25%。

Development of fuel cell products must consider multiple factors such as temperature,humidity,trigger,etc.This study developed a gas diffusion layer using multi-layer microporous layer to achieves the effect of hydrophobic gradients,making it easy for the fuel cell to operate in low humidity environments.Characterizations showed that the thickness of the prepared MMPL is between 260~270μm,and the gas permeability is about 145 s.Battery polarization tests showed that the sample can maintain a power output of 477 mW/cm 2 in 50% relative humidity environment,with an attenuation of only 23% compared to 100% humidity environment.By utilizing the hydrophilicity of SiO^(2),the addition of 5%wt SiO_(2) can further expand the humidity application range of the cell,which can operate in extremely low humidity(40%)environment and output a power density of 428 mW/cm 2,only 25% lower than that under 100%humidity environments.