Study on freezing characteristics of water in gas diffusion layer of proton exchange membrane fuel cells

被引：0
|
作者：
Utaka Y. [1 ,2 ]
Xu J. [1 ]
Wang G. [1 ]
Chen Z. [1 ,2 ]
机构：
[1] School of Mechanical Engineering, Tianjin University, Tianjin
[2] Key Laboratory of Efficient Utilization of Low and Medium Grade Energy, Tianjin University, Ministry of Education, Tianjin
来源：
Chen, Zhihao (zhchen2015@tju.edu.cn) | 1600年 / Materials China卷 / 72期
关键词：
Freezing characteristic; Fuel cell; Gas diffusion layer; Nucleation; Porous media; Wettability;
D O I：
10.11949/0438-1157.20201184
中图分类号：
学科分类号：
摘要：
To study the freezing characteristics of the water-containing gas diffusion layer (GDL) and the law of water migration, a visual observation system of the freezing process of the water-containing GDL was designed and built. The freezing process of the water-containing GDL was studied by visual experiment research. The temperature change during the freezing process of the water-containing GDL was analyzed. The influence of wettability and supercooling degree on freezing probability were analyzed. Experimental results show that the sudden freezing at a nucleation point of the GDL causes the release of the supercooled state of the water inside the entire GDL, and then the supercooled water is squeezed out of the GDL pores under the volume expansion force of liquid-solid phase change. Water inside the hydrophobic GDL freezes at higher supercooling degree. With the decrease of GDL temperature, the freezing probability of supercooled water inside GDL increases continuously. This study explores the freezing characteristics of the water-containing GDL, which can lay a foundation for solving the problem of the water-containing GDL freezing during the cold start-up of the proton exchange membrane fuel cell (PEMFC) in the future. © 2021, Editorial Board of CIESC Journal. All right reserved.
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页码：2276 / 2282
页数：6
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