多孔分布对聚合物电解质膜燃料电池阴极液水管理影响的分析

IF 1.3 4区 工程技术 Q2 ENGINEERING, AEROSPACE
Faycel Khemili, Mustapha Najjari
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引用次数: 0

摘要

质子交换膜燃料电池(PEMFC)技术最近受到越来越多的关注,在低重力或微重力的太空任务中可以发挥更大的作用。质子交换膜燃料电池(PEMFC)的气体扩散层(GDL)中产生的液态水增加了氧气流向催化剂层的阻力。GDL 内的水浸会影响 PEMFC 的性能,尤其是在电流密度较高的情况下。因此,充分了解 GDL 中液态水量的影响对于水管理以及燃料电池的性能至关重要。本研究旨在探讨 GDL 的微观结构特征对 GDL 内部水浸和液态水分布的影响。研究建立了一个一维理论模型。结果表明,孔隙率梯度对液态水饱和度和 PEM 燃料电池的性能有显著影响。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Analytical Analysis of the Effects of the Porosity Distribution on Liquid–Water Management in the Cathode of a Polymer Electrolyte Membrane Fuel Cell

Analytical Analysis of the Effects of the Porosity Distribution on Liquid–Water Management in the Cathode of a Polymer Electrolyte Membrane Fuel Cell

Analytical Analysis of the Effects of the Porosity Distribution on Liquid–Water Management in the Cathode of a Polymer Electrolyte Membrane Fuel Cell

Proton Exchange Membrane Fuel Cell (PEMFC) technology has been receiving more attention recently and can play a more expanded role in space missions with low gravity or microgravity. The liquid water generation in the Gas Diffusion Layer (GDL) of a Proton Exchange Membrane Fuel Cell (PEMFC) increases the resistance to oxygen flow toward the catalyst layer. Water flooding inside the GDL can affect the PEMFC performance especially at higher current densities. Therefore, a good understanding of the effect of liquid water amount in the GDL is crucial to water management and, subsequently, to the performance of the fuel cell. The purpose of the present study is to investigate the effect of the microstructure characteristics of the GDL on the water flooding and liquid water distribution inside the GDL. A one-dimensional theoretical model has been developed. Results indicate that the porosity gradient has a significant effect on the liquid water saturation and the performance of the PEM fuel cell.

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来源期刊
Microgravity Science and Technology
Microgravity Science and Technology 工程技术-工程:宇航
CiteScore
3.50
自引率
44.40%
发文量
96
期刊介绍: Microgravity Science and Technology – An International Journal for Microgravity and Space Exploration Related Research is a is a peer-reviewed scientific journal concerned with all topics, experimental as well as theoretical, related to research carried out under conditions of altered gravity. Microgravity Science and Technology publishes papers dealing with studies performed on and prepared for platforms that provide real microgravity conditions (such as drop towers, parabolic flights, sounding rockets, reentry capsules and orbiting platforms), and on ground-based facilities aiming to simulate microgravity conditions on earth (such as levitrons, clinostats, random positioning machines, bed rest facilities, and micro-scale or neutral buoyancy facilities) or providing artificial gravity conditions (such as centrifuges). Data from preparatory tests, hardware and instrumentation developments, lessons learnt as well as theoretical gravity-related considerations are welcome. Included science disciplines with gravity-related topics are: − materials science − fluid mechanics − process engineering − physics − chemistry − heat and mass transfer − gravitational biology − radiation biology − exobiology and astrobiology − human physiology
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