Dynamic behaviors of PEM fuel cells under load changes

被引：42
|
作者：
Li, Xiaolong [1 ]
Han, Kai [1 ]
Song, Yu [1 ]
机构：
[1] Beijing Inst Technol, Sch Mech Engn, Beijing 100081, Peoples R China
来源：
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY | 2020年 / 45卷 / 39期
关键词：
PEM fuel cell; Water distribution; Dynamic response; Transient behaviors; WATER; TRANSPORT; COMBUSTION; ABSORPTION; MODEL;
D O I：
10.1016/j.ijhydene.2019.12.034
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
In this study, a one-dimensional isothermal single-phase transient model considering the finite-rate water absorption/desorption of membrane was established to study the dynamic behaviors of polymer electrolyte membrane (PEM) fuel cells under different cathode inlet humidity conditions in the presence of voltage step changes. Both the overshoot and undershoot phenomena were observed. Moreover, the distributions of water inside the electrolyte and the influence of that on the response current density of fuel cells were analyzed. When voltage stepped up/down, the water content in anode generally increased/decreased, and the water content in cathode is reversed. If the cathode intake is fully humidified, the water vapor in cathode is always over-saturated causing the change of ionic resistance is determined by that of the water content in anode. If the cathode intake is partially humidified, the change of ionic resistance could maintain within a small range owing to the change of water content in anode can be balanced by that of the water content in cathode. (C) 2020 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.
引用
收藏
页码：20312 / 20320
页数：9
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