High performance electrodes modified by TiCN for vanadium redox flow batteries

Future Batteries Pub Date : 2025-02-01 DOI:10.1016/j.fub.2025.100032

Jinze Zhang , Haoyao Rao , Lyuming Pan , Kejun Yan , Jiayou Ren , Tianshou Zhao

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Abstract

Graphite felts (GFs) are the main materials for electrodes in vanadium redox flow batteries (VRFBs) due to their high stability, excellent conductivity and large surface area. However, the poor electrochemical activity of GFs constrains the performance of VRFBs. In this study, the titanium carbonitride (TiCN) nanoparticles are employed to modify the graphite felt electrodes of VRFBs to enhance the sluggish electrochemical kinetics of the V²⁺/V³⁺ redox reactions. Cyclic voltammetry (CV) results demonstrate that the oxidation peak shifts negatively by 0.0917 V when the electrode is modified with TiCN nanoparticles compared to carbon nanoparticle-modified GFs, indicating improved electrochemical kinetics. Furthermore, the full battery charge-discharge test reveals that the energy efficiency of the TiCN-modified GFs reaches 86.6 % at a current density of 100 mA cm⁻², surpassing the efficiencies of the carbon-modified GFs (81.4 %) and the pristine GFs (76.7 %). These results suggest that TiCN nanoparticles significantly enhance the electrochemical kinetics of the V²⁺/V³⁺ redox reactions on GFs.

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钒氧化还原液流电池用TiCN改性高性能电极

石墨毡具有稳定性高、导电性好、表面积大等优点，是钒氧化还原液流电池的主要电极材料。然而，GFs较差的电化学活性制约了vrfb的性能。在本研究中，采用碳氮化钛（TiCN）纳米颗粒修饰vrfb的石墨毡电极，以改善V2+/V3+氧化还原反应的缓慢电化学动力学。循环伏安法（CV）结果表明，与碳纳米粒子修饰的电极相比，TiCN纳米粒子修饰的电极氧化峰负移了0.0917 V，表明电化学动力学得到了改善。此外，全电池充放电测试表明，在电流密度为100 mA cm−2时，ticn修饰的GFs的能量效率达到86.6% %，超过了碳修饰的GFs（81.4 %）和原始GFs（76.7 %）。这些结果表明，TiCN纳米颗粒显著增强了GFs上V2+/V3+氧化还原反应的电化学动力学。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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Future Batteries

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