Performance assessment of gas crossover phenomenon and water transport mechanism in high pressure PEM electrolyzer
| Autor: | S. Khodabakhsh, Ebrahim Afshari, Somayeh Toghyani, N. Jahantigh |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
Materials science
Water transport Hydrogen Renewable Energy Sustainability and the Environment Energy Engineering and Power Technology Proton exchange membrane fuel cell chemistry.chemical_element 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences Cathode 0104 chemical sciences law.invention Anode Fuel Technology chemistry law Mass transfer Composite material 0210 nano-technology Ohmic contact Polymer electrolyte membrane electrolysis |
| Zdroj: | International Journal of Hydrogen Energy. 46:11029-11040 |
| ISSN: | 0360-3199 |
| DOI: | 10.1016/j.ijhydene.2020.10.180 |
| Popis: | To improve proton exchange membrane (PEM) electrolyzes’ performance the voltage loss through them should be avoided. In this work, it is intended to analyze losses including of diffusion loss, ohmic loss due to electrode, bipolar plate (BP), and membrane resistances, and gas crossover associated with the water transferring mechanisms. All of the losses are associated with water transferring mechanisms, which is created due to electro-osmoic drag, pressure differential between the anode and cathode sides, and diffusion. Furthermore, the effect of membrane thickness, cathode pressure, and operating temperature on the hydrogen crossover is examined. In addition, the contribution of ohmic loss due to electrode bipolar plate (BP), and membrane resistances is studied and, the contribution of different losses on the cell performance is discussed. Results show that raising cathode pressure from 1 to 40 bar lead to the increment of anodic hydrogen content from 1.038% to 21% at the specific current density of 10,000 A/m2. Enhancing the thickness of membrane has considerable impact on decrementing anodic hydrogen content, but the mass transfer loss rises from 0.022 to 0.027 V with enhancing membrane thickness from 50 to 300 μm, respectively. Furthermore, the contribution of voltage losses, assigned to each of losses are equal to 85%, 3%, and 12% for activation, diffusion and ohmic losses, respectively. It is found that, from the reported contribution for ohmic loss, the contribution of electrode BP, and membrane resistances are 31% and 69%, respectively. |
| Databáze: | OpenAIRE |
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