The influence of external operating conditions on membrane drying faults of proton-exchange membrane fuel cells
The influence of external operating conditions on membrane drying faults of proton-exchange membrane fuel cells
复制标题
DOI：
10.1016/j.energy.2023.128787
复制
发表时间：
2023-08
期刊：
影响因子：
9
通讯作者：
Fei Xiao;Tao Chen;Zhongyu Gan;Ruixuan Zhang
中科院分区：
文献类型：
--
作者：
Fei Xiao;Tao Chen;Zhongyu Gan;Ruixuan Zhang
研究水分管理失效的影响有助于改善水分管理策略，缓解洪涝或干旱故障。为探讨不同运行条件下干燥故障对质子交换膜燃料电池（PEMFC）性能的影响，采用阴极压降、电压信号和电化学阻抗谱（EIS）相结合的实验测量方法。首先，在不同的操作条件下进行多组干燥实验，在实验期间收集阴极压降和电压数据，并进行动态EIS测量。通过对压降和电压变化趋势的分析，得出了不同操作条件对干燥故障的影响。此外，使用RL（RQ-RC）等效电路模型对EIS结果进行参数识别，以获得欧姆、电荷转移和质量转移阻抗值。最后，通过阻抗变化验证了干燥故障的演变和影响。实验结果表明，随着干燥故障程度的增加，欧姆阻抗和电荷传递阻抗显著增加，而传质阻抗只表现出很小的波动或轻微的增加。增加阴极背压缓解干燥;更大的阴极化学计量比增加干燥速率，更高的电池温度更可能导致严重的干燥。
A study of the influence of water management failure can help improve water management strategies, relieve flooding or drying faults. To explore the influence of drying faults on proton-exchange membrane fuel cells (PEMFCs) under different operating conditions, this study adopted an experimental measurement method combining a cathode voltage drop, voltage signal and electrochemical impedance spectroscopy (EIS). First, multiple sets of drying experiments were performed under different operating conditions, cathodic pressure drop and voltage data were collected during the experiments, and dynamic EIS measurements were performed. Then, by analyzing the pressure drop and voltage trends, the influence of different operating conditions on drying faults was obtained. In addition, the EIS results were parametrically identified using an RL(RQ-RC) equivalent circuit model to obtain ohmic, charge transfer, and mass transfer impedance values. Finally, the evolution and influence of drying faults were verified by impedance variations. The experimental results showed that the ohmic and charge transfer impedance increased significantly with the degree of drying fault, while the mass transfer impedance showed only a small fluctuation or slight increase. Increasing the cathodic back-pressure relieved drying; a larger cathodic stoichiometric ratio increased the drying rate, and a higher cell temperature was more likely to cause severe drying.