Two‐Dimensional MXene as a Nanofluidic Anolyte Additive for Enhancing Performance of Vanadium Redox Flow Batteries
Two‐Dimensional MXene as a Nanofluidic Anolyte Additive for Enhancing Performance of Vanadium Redox Flow Batteries
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DOI：
10.1002/batt.202200321
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发表时间：
2022-10
期刊：
影响因子：
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通讯作者：
Ali Vala Mizrak;Jonathan C. Ehring;M. Shekhirev;Robert W. Lord;Bilen Aküzüm;Pushpendra Singh;Y. Gogotsi;E. C. Kumbur
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文献类型：
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作者：
Ali Vala Mizrak;Jonathan C. Ehring;M. Shekhirev;Robert W. Lord;Bilen Aküzüm;Pushpendra Singh;Y. Gogotsi;E. C. Kumbur
在这项工作中，研究了Ti 3 C2 TxMXene作为钒氧化还原液流电池中的纳米流体阳极电解液添加剂，以改善V2+/V3+氧化还原反应的缓慢动力学。在流动和静态条件下进行了许多电化学测试，以证明MXenes用于VRFB应用的有效性。还进行了压降测试和形态分析，以更好地理解MXene添加到阳极电解液中的水力效应。浓度为0.10和0.15wt%的纳米流体阳极电解液表现出最好的电化学性能，尽管前者在合理的压降范围内引起较少的加重水力效应。 在200 mA cm-2的电流密度下，含有0.10重量% MXene的纳米流体分析物能够利用67%的理论容量。 相反，对于原始阳极电解液，由于过度损失，仅可利用理论容量的10%。此外，观察到纳米流体电解质的能量效率高达74%，与原始阳极电解质相比增加了25%。首先，电池性能的提高归因于对阳极V2+/V3+氧化还原反应的电催化活性的提高。此外，动态的网状流动电极网络显示出通过在孔内产生额外的、丰富的和电化学活性的表面来增加多孔碳毡电极的传质能力。
In this work, Ti3C2TxMXene was investigated as a nanofluidic anolyte additive in vanadium redox flow batteries to improve the sluggish kinetics of V2+/V3+redox reaction. Numerous electrochemical tests under flow and static conditions were performed to demonstrate the effectiveness of MXenes for VRFB applications. Pressure drop tests and morphology analysis were also conducted to better understand the hydraulic effects of MXene addition into the anolyte. The nanofluidic anolytes with the concentration of 0.10 and 0.15 wt% showed the best electrochemical performance, although the former induced less aggravated hydraulic effects within a reasonable pressure drop range. At a current density of 200 mA cm−2, the nanofluidic analyte containing 0.10 wt% MXene was able to utilize 67 % of the theoretical capacity. Contrarily, with the pristine anolyte, only 10 % of the theoretical capacity could be utilized due to excessive losses. Moreover, the energy efficiency up to 74 % is observed for the nanofluidic electrolyte, which is an increase of 25 % compared to the pristine anolyte. Primarily, the enhanced battery performance was attributed to the improved electrocatalytic activity towards the anodic V2+/V3+redox reaction. Furthermore, a dynamic, web‐like, flowing electrode network is shown to increase the mass transport capacity of porous carbon felt electrodes by creating additional, abundant, and electrochemically active surfaces within the pores.