聚对氨基苯磺酸修饰石墨毡电极在全钒液流电池中的应用

Poly-sulfosalicylic Acid Modified Graphite Felt as Electrode for All-vanadium Redox Flow Batteries

通过电聚合和高温碳化的方法在石墨毡电极碳纤维表面修饰对氨基苯苯磺酸。用扫描电镜和电化学工作站分别表征了材料的表面形貌和电化学性质。结果表明:在石墨毡纤维表面均匀的分布着聚对氨基苯磺酸反应位点;电极不仅对V^(3+)/V^(2+)与VO^(2+)/VO_2^+电对具有很好的电催化性能,而且有效抑制了负极析氢过程,该电极在电流密度为180 m A/cm2情况下,能量效率为70%,表现出优异的综合电化学性能。

The carbon fiber of graphite felt was modified on the surface by sulfanilic acid through electro-polymerization and high-temperature carbonization. The active reaction site of sulfanilic acid was evenly distributed on the surface of graphite felt fiber by SEM. The graphite felt electrode not only showed excellent electro-catalysis property towards V^3＋/V^2＋ and VO^2＋/VO2^＋, but also limited hydrogen evolution on the negative electrode. And the graphite felt electrode possed great electrochemical performance. It exhibited a 70% in energy efficiency at the current density of 180 m A/cm^2.