Experimental study of the S-shaped flow fields in proton exchange membrane fuel cells
Experimental study of the S-shaped flow fields in proton exchange membrane fuel cells
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质子交换膜燃料电池S形流场实验研究
DOI：
10.1016/j.enconman.2020.113292
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发表时间：
2020-11
影响因子：
10.4
通讯作者：
Zhigang Shao
中科院分区：
文献类型：
--
作者：
Liang He;Ming Hou;Yanyan Gao;Xinye Sun;Wei Song;Limin Zheng;Jun Ai;Hongjie Zhang;Zhigang Shao
流场对提高质子交换膜燃料电池（PEMFC）的性能起着重要作用。然而，传统的平行流场的弱传质能力严重影响电池性能，特别是在高电流密度下。在这项工作中，一系列的S形流场的设计和实验验证。通过记录不同阴极相对湿度（RH）和化学计量比下的极化曲线，详细研究了S半径（R）和S长度（H）等关键设计参数对电池性能的影响。结果表明，小的R和大的H值有利于提高电池性能，增加了电池内的湍流，降低了电池内的液态水含量，电化学阻抗谱（EIS）也证实了这一点。然而，压降同时显著增加，这影响了电池的输出能力。考虑到净输出容量和加工处理可能性，S半径为17.4 mm、S长度为40 mm的电池表现出1.02 W cm-2的峰值功率密度，比CPFF（870 W cm-2）高15%。
Flow fields play an important role in performance enhancement of a Proton Exchange Membrane Fuel Cells (PEMFCs). However, the weak mass transport ability of the conventional parallel flow field seriously affects the cell performance, especially at high current density. In this work, a series of S-shaped flow fields are designed and experimentally verified. The effects of key design parameters, such as the S radius (R) and the S length (H), on the cell performance are investigated in detail by recording the polarization curves under different cathode relative humidity (RH) levels and stoichiometric ratios. The results indicate that the small R and large H are beneficial to the promotion of cell performance owing to the increased turbulence and decreased liquid water content in the cell, which is also proved by the electrochemical impedance spectroscopy (EIS). However, the pressure drop significantly increases at the same time, which affects the output ability of the cell. Considering the net output capacity and the processing processing possibility, the cell with the S radius of 17.4 mm and the S length of 40 mm exhibited the peak power density of 1.02 W cm−2, with 15% higher than the CPFF (870 W cm−2).
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影响因子：
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作者：
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通讯作者：
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影响因子：
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通讯作者：
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