阳极
阴极
化学
水运
体积流量
水流
脱水
扩散
湿度
气体扩散
膜
相对湿度
分析化学(期刊)
化学工程
环境工程
热力学
色谱法
电极
环境科学
工程类
物理化学
物理
生物化学
作者
María I. León,Jonathan Valentín-Reyes,T. Romero-Castañón,José Beltrán,José Roberto Flores-Hernández,José L. Nava
出处
期刊:Applied Energy
[Elsevier]
日期:2022-10-01
卷期号:324: 119722-119722
被引量:6
标识
DOI:10.1016/j.apenergy.2022.119722
摘要
The water movement between the anodic and cathodic sides of a fuel cell (AEMFCs) motivated the analysis of the effect exerted by the operational conditions on the water direction using a commercial anion exchange membrane (IONOMR®). This work shows the capability to favor the electro-osmotic drag (EOD) or the diffusion water transport mechanisms under different gas flow rates and humidities. Accordingly, the results demonstrated that the EOD predominance was promoted when low symmetric flow rates (125 cm3 min−1 for anode and cathode) were used in the AEMFC, suggesting membrane dehydration. On the contrary, the water diffusion dominance appears under asymmetric flow rates between anode and cathode (125 and 250 cm3 min−1, respectively); under these conditions, the membrane dehydration might be suppressed by anode flooding alleviation. The AEMFC performance was affected by the water transport mechanism, giving lower peak power densities for EOD-dominated systems (35.2 mW cm−2 at 60 °C) than those obtained by diffusion (62.8 mW cm−2 at 60 °C). The most suitable operating condition is under water-diffusion at non-saturated streams (below 65%), where a decrease in performance is experienced as the humidifier temperature increases from 60 °C to 80 °C (supersaturated flow), giving peak power densities of 62.8 and 3.7 mW cm−2, respectively.
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