关于HT-PEM燃料电池的水和氧传输特性研究
Hongbin He1, Haisi Peng1, Guangchao Li1
1Shenyang Aerospace University, China.
Heliyon
|October 9, 2023
概括
在高温质子交换膜燃料电池 (HT-PEMFCs) 中,更厚的扩散层提高了质量转移均性和氧气保留. 这一发现为优化燃料电池性能和设计提供了洞察力.
科学领域:
- 电化学 电化学 电化学
- 材料科学 材料科学 材料科学
- 化学工程是化学工程的重要组成部分.
背景情况:
- 高温质子交换膜燃料电池 (HT-PEMFCs) 对清洁能源至关重要.
- 在气体扩散层 (GDL) 中优化质量转移对于燃料电池效率至关重要.
- 需要了解组装力和扩散层厚度对GDL性能的影响.
研究的目的:
- 为HT-PEMFCs开发一个稳定状态模型,包括机械,流体动力学和电化学方程.
- 研究在组装力下扩散层厚度变形如何影响孔隙分布和质量转移.
- 分析运行电位和流场设计对阴极扩散层内的度变化的影响.
主要方法:
- 使用COMSOL多物理学的结合多物理模型的开发,集成机械,纳维埃-斯托克斯,麦克斯韦-斯蒂芬和巴特勒-沃尔默方程.
- 模拟在不同厚度和组装力下扩散层孔隙变化的模拟.
- 分析不同电流密度和运行潜力的阴极扩散层中的水和氧度分布.
主要成果:
- 装配力和流场设计导致孔隙分布不均,导致GDL中的横向电流.
- 扩散层厚度增加导致氧气消耗减少,并在GDL中保持较高的氧气.
- 模拟表明,更厚的扩散层促进了更均的质量转移和扩散.
结论:
- 更厚的扩散层有利于增强HT-PEMFCs中的质量转移均性和氧气可用性.
- 组装力和流场之间的相互作用显著影响GDL性能.
- 这些发现为优化质量转移,提高HT-PEMFC的性能和应用提供了宝贵的参考.
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