Measurement of solidification heat from supercooled water freezing during PEFC cold start and visualization of ice distribution
Measurement of solidification heat from supercooled water freezing during PEFC cold start and visualization of ice distribution
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PEFC 冷启动过程中过冷水冻结的凝固热测量和冰分布可视化
DOI:
10.1016/j.ijhydene.2020.04.004
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发表时间:
2020
影响因子:
7.2
通讯作者:
Araki Takuto
中科院分区:
文献类型:
--
作者:
Otsuki Yota;Tamada Yusuke;Inoue Shoki;Shigemasa Kaito;Araki Takuto
The water in polymer electrolyte fuel cells (PEFCs) operated below the freezing point interferes with the gas supply, shutting down the operation. Therefore, understanding the freezing mechanism is pivotal to achieving high-performance cold-start. In this paper, a novel method of classifying two different freezing modes using 6 μm thickness thin-film thermocouples (TFTCs) was proposed. We conductedin situmeasurement of the solidification heat from supercooled water using originally developed TFTCs and further visualized the ice distribution using X-ray CT. In a mode when TFTCs measure rapid temperature rises in the −10 °C ~ −5 °C, water freezes after diffusing into the GDL, while freezing occurs immediately inside the CL without reaching the GDL in the other mode when TFTCs measure no rapid temperature rise in the −30 °C ~ −10 °C. These modes should be considered for future researches on components improvement, and optimization of current density sweeping to succeed the cold start.
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DOI:
10.1149/1.2780958
发表时间:
2007-09
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影响因子:
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