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Enhancing Vanadium Redox Flow Battery Negative Electrodes with Vanadium Nitride Nanorod-Assembled Microspheres Modified Graphite Felt
Electrochimica Acta ( IF 5.5 ) Pub Date : 2025-01-25 , DOI: 10.1016/j.electacta.2025.145731
Hongwei Li, Songtao Liang, Qicheng Zhang, Jin Wang, Mingqin Liu

The slow kinetics of carbon-based negative electrodes limit the widespread engineering applications of vanadium redox flow batteries (VRFBs). In this study, we developed a method to prepare vanadium nitride (VN) nanorod-assembled microspheres uniformly loaded on graphite felt (GF) fibers. Vanadium dioxide (VO2) nanorod microspheres were first in-situ grown on GF fibers and then converted into VN microspheres through a nitridation process. The resulting VN@GF electrode demonstrated high performance as a negative electrode for VRFBs. Electrochemical and single-cell performance tests confirmed the significant catalytic effect of VN microspheres on the V3+/V2+ redox pair. At a current density of 150 mA cm-2, the VN@GF electrode improved voltage efficiency (VE) and energy efficiency (EE) by 19% and 18%, respectively, compared to the GF electrode. Additionally, after 300 charge-discharge cycles at 200 mA cm-2, the battery retained 75% of its discharge capacity, with stable EE and VE. The enhanced performance is attributed to the VN microspheres on the electrode surface, which increase the contact area between the electrode and the electrolyte, while also improving the adsorption of reactive ions, thereby enhancing the electrode's electrochemical properties. Moreover, the VN@GF electrode demonstrates excellent stability and emerge as a promising candidate for VRFB negative electrode application.

中文翻译:


用氮化钒纳米棒组装的微球改性石墨毡增强钒氧化还原液流电池负极



碳基负极的缓慢动力学限制了钒氧化还原液流电池 (VRFB) 的广泛工程应用。在这项研究中,我们开发了一种制备均匀负载在石墨毡 (GF) 纤维上的氮化钒 (VN) 纳米棒组装微球的方法。二氧化钒 (VO 2 ) 纳米棒微球首先在 GF 纤维上原位生长,然后通过氮化过程转化为 VN 微球。所得VN@GF电极表现出作为 VRFB 负极的高性能。电化学和单电池性能测试证实了 VN 微球对 V 3+ /V 2+ 氧化还原对的显着催化作用。在 150 mA cm -2 的电流密度下,与 GF 电极相比,VN@GF 电极的电压效率 (VE) 和能效 (EE) 分别提高了 19% 和 18%。此外,在 200 mA cm -2 下进行 300 次充放电循环后,电池仍保留了 75% 的放电容量,EE 和 VE 稳定。性能的增强归功于电极表面的 VN 微球,它增加了电极与电解质之间的接触面积,同时还改善了反应离子的吸附,从而增强了电极的电化学性能。此外,VN@GF电极表现出优异的稳定性,是 VRFB 负极应用的有前途的候选者。
更新日期:2025-01-25
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