<br>零间隙碱性水电解堆中隔板的传质限制现象：阴离子选择性聚合物电解质膜与 Zirfon™ Perl UTP 500 案例研究,Chemical Engineering Journal

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零间隙碱性水电解堆中隔板的传质限制现象：阴离子选择性聚合物电解质膜与 Zirfon™ Perl UTP 500 案例研究
Chemical Engineering Journal ( IF 13.3 ) Pub Date : 2023-11-24 , DOI: 10.1016/j.cej.2023.147354
Karel Denk , Roman Kodým , Jaromír Hnát , Martin Paidar , Thomas Turek , Karel Bouzek

努力降低循环介质中的 KOH 浓度是当今研究的一个重要目标。它们与当前提高碱性水电解灵活性并提高其可再生能源效率的努力有关。本研究报告了在具有两种隔膜类型的实验室碱性水电解堆中，降低 KOH 溶液浓度对质量和电荷传输的影响。使用的隔膜是基于氯甲基化聚苯乙烯-嵌段-聚（乙烯-无规丁烯）-嵌段-聚苯乙烯共聚物的均质阴离子选择性聚合物电解质膜，由1,4-二氮杂双环[2.2.2]辛烷和商业复合材料功能化多孔 Zirfon™ Perl UTP 500 隔膜。该电池堆以零间隙模式组装，并使用电极的双极连接。记录不同 KOH 浓度和操作温度的负载曲线，以评估电堆的性能。令人惊讶的是，对于 Zirfon™ Perl UTP 500 分离器，在 KOH 浓度低于 2 wt% KOH 时观察到了堆的传质限制行为。对于使用阴离子选择性膜作为分离器的电池堆来说，情况并非如此。我们开发并实施了一维单细胞稳态数学模型，以阐明这一现象并了解在此过程中跨不同类型分离器的质量传输的细节。这些信息对于理解一旦 KOH 浓度接近零（即该领域研究的最终目标）所面临的障碍至关重要。

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Mass transfer limitation phenomena across the separator in a zero-gap alkaline water electrolysis stack: Anion-selective polymer electrolyte membrane vs. Zirfon™ Perl UTP 500 case study

Endeavours to decrease the KOH concentration in a circulating medium represent an important target of today's research. They are connected with current efforts to increase the flexibility of alkaline water electrolysis and improve its efficiency with regard to renewable energy sources. This study reports on the impact of reduced KOH solution concentration on mass and charge transport in a laboratory alkaline water electrolysis stack with two separator types. The separators used are a homogeneous anion-selective polymer-electrolyte membrane based on chloromethylated polystyrene-block-poly(ethylene-ran-butylene)-block-polystyrene copolymer functionalised by 1,4–diazabicyclo[2.2.2]octane and a commercial composite porous Zirfon™ Perl UTP 500 diaphragm. The stack was assembled in zero-gap mode and a bipolar connection of the electrodes was used. Load curves were recorded for different KOH concentrations and operational temperatures to assess the performance of the stack. Surprisingly, mass transfer limiting behaviour of the stack was observed at KOH concentrations below 2 wt% KOH for the Zirfon™ Perl UTP 500 separator. This was not the case for the stack utilising an anion-selective membrane as a separator. A 1-dimensional, single cell, stationary mathematical model was developed and implemented to clarify this phenomenon and to understand the details of the mass transport across the different types of separators in this process. This information is crucial for understanding obstacles faced once the concentration of KOH approaches zero, i.e., the final target of research in this field.

更新日期：2023-11-24

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