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.
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