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采用在氨气氛下加热(NCP-600:600℃下处理,NCP-900:900℃下处理)对全钒液流电池碳纸电极进行掺氮改性处理。通过此改性处理,含氮官能团成功地引入到碳纸表面。掺氮处理改善了碳纸表面的亲水性,NCP-900的接触角相比于空白碳纸由120.5°降到99.7°,且对表面形貌没有明显影响,不会影响其机械性能。同时,掺氮处理能明显地增强碳纸的电化学活性,循环伏安测试中,NCP-900的V(IV)/V(V)电对氧化峰为92.1 mA,远高于空白碳纸(68.9 mA)。由NCP-900和空白碳纸组装成电池考察了其充放电性能,在20 m A/cm2下进行充放电,由NCP-900组装的电池其能量效率为83.73%,较空白电池高2.59%。掺氮改性处理提高碳纸的电化学性能主要是由于钒电对活性位点的增加和亲水性能的增强。
The carbon paper electrode of vanadium redox flow battery was modified by nitrogen in the atmosphere of ammonia (NCP-600: 600 ℃, NCP-900: 900 ℃). Through this modification, nitrogen-containing functional groups were successfully introduced onto the carbon paper surface. Nitrogen treatment improves the hydrophilicity of the surface of carbon paper. The contact angle of NCP-900 decreases from 120.5 ° to 99.7 ° compared with that of blank carbon paper, and has no obvious effect on the surface morphology and does not affect its mechanical properties. At the same time, the electrochemical activity of carbon paper was obviously enhanced by nitrogen-doped treatment. The V (IV) / V (V) oxidation peak of NCP-900 was 92.1 mA in cyclic voltammetry, which was much higher than that of blank carbon paper 68.9 mA). The charge-discharge performance of NCP-900 and blank carbon paper was evaluated. The charge-discharge performance was 20 m A / cm2. The battery assembled by NCP-900 had energy efficiency of 83.73% and 2.59% higher than that of blank battery. Nitrogen modification treatment to improve the electrochemical properties of carbon paper is mainly due to the vanadium active sites on the increase and hydrophilic properties.