Abstract
Anodic oxidation with different electrolyte was employed to improve the electrochemical properties of carbon paper as negative electrode for vanadium redox battery (VRB). The treated carbon paper exhibits enhanced electrochemical activity for V2+/V3+ redox reaction. The sample (CP-NH3) treated in NH3 solution demonstrates superior performance in comparison with the sample (CP-NaOH) treated in NaOH solution. X-ray photoelectron spectroscopy results show that oxygen- and nitrogen-containing functional groups have been introduced on CP-NH3 surface by the treatment, and Raman spectra confirm the increased surface defect of CP-NH3. Energy storage performance of cell was evaluated by charge/discharge measurement by using CP-NH3. Usage of CP-NH3 can greatly improve the cell performance with energy efficiency increase of 4.8% at 60 mA/cm2. The excellent performance of CP-NH3 mainly results from introduction of functional groups as active sites and improved wetting properties. This work reveals that anodic oxidation is a clean, simple, and efficient method for boosting the performance of carbon paper as negative electrode for VRB.
摘要
本文利用阳极氧化来提升钒液流电池负极碳纸电极电化学性能。改性电极对V2+/V3+反应展现 了优异的电化学活性。相比NaOH 溶液处理的CP-NaOH 样品, NH3 溶液处理的CP-NH3 样品展现了 更好的性能。XPS 结果显示含氧和含氮官能团被引入到CP-NH3 表面, 拉曼光谱确认了CP-NH3 表面 增加的缺陷。通过充放电实验来评估CP-NH3 对钒电池储能性能的影响, 使用CP-NH3 可大幅度提升 电池性能, 在60 mA/cm2 时能量效率提升4.8%。CP-NH3 优异的性能主要来自于官能团的引入和提升 的润湿性能, 本文工作说明阳极氧化是一种清洁、简单、高效的提升钒液流电池负极碳纸电极性能的 方法。
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Foundation item: Project(NCET-10-0946) supported by Program for New Century Excellent Talents in University of China; Project(2017JY0038) supported by Science and Technology Key Project of Sichuan Province, China; Project(2013TX8 ) supported by Titanium and Titanium Alloy Innovation Team of Panzhihua City, China
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Hou, Bx., Cui, Xm., Zhang, Q. et al. Improving electrochemical properties of carbon paper as negative electrode for vanadium redox battery by anodic oxidation. J. Cent. South Univ. 26, 1435–1442 (2019). https://doi.org/10.1007/s11771-019-4099-2
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DOI: https://doi.org/10.1007/s11771-019-4099-2