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通过H2限制电流测试,阐明气体扩散层的质量运输行为

Min Wang¹, Wei Zhao¹, Shuhan Kong²

¹College of New Energy, China University of Petroleum (East China), Qingdao 266580, China.

Materials (Basel, Switzerland)

|August 26, 2023

概括

气体扩散层是气体扩散层.

科学领域:

质子交换膜燃料电池 (PEMFC) 和材料科学.

背景情况:

气体扩散层 (GDL) 对PEMFC性能至关重要,它会影响高电流密度的质量传输.
了解GDL结构-属性关系对于优化燃料电池效率至关重要.

研究的目的:

为了研究GDL结构和质量运输特性之间的相关性.
使用现场方法量化GDL中的质量运输阻力.

主要方法:

建立了使用H2分子探针测量GDL质量传输电阻的限制电流测试.
在不同的湿度和反压下,研究了三种具有微孔层 (MPL) 和没有微孔层 (MPL) 的代表性GDL.
分析了H2传输,并将总电阻分为压力依赖 (RP) 和压力独立 (RNP) 组件.

主要成果:

GDL输送阻力 (RDM) 受宏基质 (MPS) 厚度,毛孔大小分布和MPL特征的影响.
较小的孔径和较厚的MPL增加了气体运输阻力.
RNP主要归因于MPL的运输阻力,厚的MPL显示最高的RNP,没有MPL的GDL显示零RNP.

结论:

在现场开发的方法准确地测量了气体扩散介质中的质量传输电阻.
包括MPL厚度和基质孔径大小在内的GDL结构特征显著影响PEMFC性能.
这种方法促进了先进的PEMFCs的开发和部署.

关键词:

气体扩散层是一种气体扩散层.探测器探测气的探测器限制电流的限制电流.大众运输的阻力.质子交换膜燃料电池是一种燃料电池.

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