流场的面内梯度设计可增强氧化还原液流电池的对流,Energy Advances

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流场的面内梯度设计可增强氧化还原液流电池的对流
Energy Advances ( IF 3.2 ) Pub Date : 2023-10-13 , DOI: 10.1039/d3ya00365e
Lyuming Pan ₁ , Jianyu Xie ₁ , Jincong Guo ₁ , Dongbo Wei ₁ , Honghao Qi ₁ , Haoyao Rao ₁ , Puiki Leung ₂ , Lin Zeng ₁ , Tianshou Zhao ₁ , Lei Wei ₁

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在氧化还原液流电池领域，流场对于影响氧化还原液流电池的整体性能起着至关重要的作用。受人类行为的启发，本文提出了一种面内梯度流场设计，其特征是从入口到出口通道宽度梯度减小。利用三维多物理仿真模型来研究与新型流场配置相关的传输行为和整体电池性能。研究表明，新颖的面内梯度设计可以增强出口附近下游区域电解质的肋下对流，从而提高活性物质在多孔电极上分布的均匀性。因此，这种增强大大减少了氧化还原液流电池的浓差极化损耗。该设计的最大功率密度和额定电流密度分别为553.2 mW cm ^-2和270.1 mA cm ^-2 ，分别比传统设计高74.5 mW cm ^-2和8.3 mA cm ^{-2 。}这些结果证实了采用所提出的流场来实现高性能电池设计的好处。同时，由于其简单、高效且易于扩展的设计机制，这种新颖的流场为氧化还原液流电池的工程应用展现了巨大的前景。

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In-plane gradient design of flow fields enables enhanced convections for redox flow batteries

In the realm of redox flow batteries, the flow field plays a vital role in influencing the overall performances of the redox flow batteries. Inspired by human behavior, an in-plane gradient flow field design featuring a gradient decrease in channel width from the inlet to the outlet is proposed in this work. A three-dimensional multi-physical simulation model was utilized to investigate the transport behaviors and overall battery performance associated with novel flow field configurations. It was indicated that the novel in-plane gradient design can enhance the under-rib convections of the electrolyte in the downstream regions near the outlet, leading to improved uniformity of the active species’ distribution over porous electrodes. Consequently, this enhancement substantially reduces concentration polarization losses of redox flow batteries. The maximum power density and rated current density of the proposed design are 553.2 mW cm⁻² and 270.1 mA cm⁻², which are 74.5 mW cm⁻² and 8.3 mA cm⁻² higher than conventional design. These results substantiate the benefits of employing the proposed flow field for achieving high-performance battery designs. Meanwhile, due to its straightforward, efficient, and easily scalable design mechanism, this novel flow field shows great promise for engineering applications of redox flow batteries.

更新日期：2023-10-13

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