用循环伏安法研究了石墨及其与乙炔黑复合所制备的电极在5mol/L H2SO4+1mol/L VOSO4溶液中的循环伏安行为, 并用扫描电镜观察了复合材料的表面形貌. 循环伏安结果表明, 石墨对全钒液流电池的正极电对V(IV)/V(V)和负极电对V(II)/V(III)的氧化还原反应具有良好的可逆性, 但氧化还原电流较小; 乙炔黑能够明显提高二电对在石墨上的氧化还原电流. 扫描电镜观察表明, 细小的颗粒状乙炔黑能够均匀地覆盖在片状石墨的表面. 通过比较复合电极的循环伏安行为, 得到用作全钒液流电池的正负极材料的最佳乙炔黑与石墨质量比分别为15:85和4:96.
The voltammetric behaviors of graphite (GP) and its composites with acetylene black (AB) were studied in 5mol/L H2 SO4+1mol/L VOSO4 solution with cyclic voltammetry (CV), and surface morphologies of the composites were observed with scan electron icroscope (SEM). The results obtained with voltammetry show that the redox couples of V(Ⅳ)/V(Ⅴ) and V(Ⅱ)/V(Ⅲ), as positive and negative electrodes of all vanadium flow liquid battery, respectively, have good reversibility but low current on the GP electrode, and the current can be improved by AB. The SEM observation shows that the granulars of AB are dispersed evenly on the surface of sheet GP when they are mixed together. The best compositions for the positive and the negative of all vanadium flow liquid battery determined by comparing voltammetric behavior of the composite electrodes with different content of AB, are (wAB:wGP) 15:85 for the positive and 4:96 for the negative.
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