基于模型的 PEM 水电解重组互层研究:浓度曲线、效率和运行极限

Steffen Brundiers, P. Trinke, B. Bensmann, R. Hanke‐Rauschenbach
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摘要

铂基重组中间膜(IL)是质子交换膜(PEM)电解过程中减缓氢氧交叉的一种有效方法。迄今为止,关于这一主题的研究只有实验研究,这些研究展示了带有IL的PEM电解池的整体行为,但没有解决局部效应问题。本文针对这些问题,首次提出了一种基于模型的方法,用于研究 PEM 水电解槽中 IL 的影响。我们的重点是局部浓度曲线、交叉通量、法拉第效率、运行限制和发热。实验验证的模型表明,IL 对溶解氢和溶解氧的局部浓度有很大影响。根据压力条件和电流密度的不同,不同的物种会限制电离层中的重组反应。结果表明,如果 IL 中存在足够的氧气来重组渗透氢,那么即使在阴极压力较高和膜较薄的情况下,IL 也能延长运行窗口。此外,我们还证明,由于存在两种相互抵消的损耗机制,IL 不会影响电池的法拉第效率。最后,我们的模拟表明,IL 中重组反应产生的热量对电池中的温度分布几乎没有影响。
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Model-Based Investigation of Recombination Interlayers in PEM Water Electrolysis: Concentration Profiles, Efficiency, and Operational Limits
Platinum-based recombination interlayers (ILs) are a promising approach to mitigate hydrogen and oxygen crossover during proton exchange membrane (PEM) electrolysis. Until now, there are only experimental investigations on this topic, which demonstrate the integral behavior of a PEM electrolysis cell with an IL but do not resolve local effects. This paper addresses these issues by proposing a first model-based approach to investigate the effects of ILs in PEM water electrolysis cells. We focus on local concentration profiles, crossover fluxes, Faraday efficiency, operational limits, and heat generation. The experimentally validated model shows that the IL substantially affects the local concentrations of dissolved hydrogen and oxygen. Depending on pressure condition and current density, different species can limit the recombination reaction in the IL. The results show that ILs can extend the operational window even for high cathode pressures and thin membranes if enough oxygen is present in the IL to recombine the permeating hydrogen. Additionally, we demonstrate that ILs do not influence the Faraday efficiency of the cell due to two counteracting loss mechanisms. Finally, our simulations indicate that the heat generation from the recombination reaction in the IL has almost no effect on the temperature distribution in the cell.
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