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首页> 外文期刊>International Journal of Heat and Mass Transfer >Effects of the diffusive mixing and self-discharge reactions in microfluidic membraneless vanadium redox flow batteries
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Effects of the diffusive mixing and self-discharge reactions in microfluidic membraneless vanadium redox flow batteries

机译：微流体膜钒氧化还原电池中扩散混合和自放电反应的影响

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摘要

Microfluidic-based membraneless redox flow batteries have been recently proposed and tested with the aim of removing one of the most expensive and problematic components of the system, the ion-exchange membrane. In this promising design, the electrolytes are allowed to flow parallel to each other along microchannels, where they remain separated thanks to the laminar flow conditions prevailing at sub-millimeter scales, which prevent the convective mixing of both streams. The lack of membrane enhances proton transfer and simplifies overall system design at the expense of larger crossover rates of vanadium ions. The aim of this work is to provide estimates for the crossover rates induced by the combined action of active species diffusion and homogeneous self-discharge reactions. As the rate of these reactions is still uncertain, two limiting cases are addressed: infinitely slow (frozen chemistry) and infinitely fast (chemical equilibrium) reactions. These two limits provide lower and upper bounds for the crossover rates in microfluidic vanadium redox flow batteries, which can be conveniently expressed in terms of analytical or semi-analytical expressions. In summary, the analysis presented herein provides design guidelines to evaluate the capacity fade resulting from the combined effect of vanadium cross-over and self-discharge reactions in these emerging systems.
机译：最近提出并测试了基于微流体的膜氧化还原流电池，其目的是去除系统的最昂贵和有问题的组件，离子交换膜之一。在本有希望的设计中，允许电解质沿着微通道彼此平行地流动，在那里由于亚毫米秤的层流动条件，它们保持分离，这防止了两种流的对流混合。缺乏膜增强质子转移，并以牺牲钒离子的较大交叉速率为代价来简化整体系统设计。这项工作的目的是提供有源物种扩散和均匀自放电反应的组合作用诱导的交叉速率的估计。随着这些反应的速率仍然不确定，解决了两个限制病例：无限慢（冷冻化学）和无限快（化学平衡）反应。这两个限制为微流体钒氧化还原流量电池中的交叉速率提供了下限和上界，这可以在分析或半分析表达方面方便地表达。总之，本文提出的分析提供了评估由这些新兴系统中的钒交叉和自放电反应的组合效果产生的能力褪色的设计指导。

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