【摘要】 以氧化石墨烯(GO)作为全钒液流电池正极电解液添加剂,研究含量不同的GO对钒电池正极电解液电导率、循环伏安曲线及电池容量和能量效率的影响。结果表明,正极电解液的电导率先随GO添加量的增加而增大,在添加量为1%(质量分数)时达到最大值326 m S/cm,随后减小;扫描速度为5 m V/s的循环伏安曲线表明当GO含量为1%时,电解液具有最大的氧化峰电流和还原峰电流,分别为172和127 m A;首次循环与第20次循环的伏安曲线对比表明电解液稳定性很好,此时电解液性能也最佳;用GO含量为1%的电解液作为正极电解液组装静态电池,电池30次充放电循环的平均容量比空白电池提高了9.8%,容量保持率和能量效率为85.30%和79.26%,分别比空白电池的79.40%和75.35%有所提高。更多还原

【Abstract】 Graphene oxide(GO) was employed as an additive of positive electrolyte for vanadium redox battery,and the effect of different content GO on the conductivity, cyclic voltammetry, battery capacity and energy efficiency performance of electrolyte was investigated. The results show that conductivity firstly increases to the maximum value of 326 m S/cm(GO weight content: 1%) with the increase of GO content and then decreases. Cyclic voltammetry test exhibits that the electrolyte with 1% GO possesses the highest anodic peak current(172 m A) and cathodic peak current(127 m A) at a scan rate of 5 m V/s. From the results of the 1st cycle compared with the 20 th,it is found that the electrolyte has good stability and optimal electrochemical activity. The 30 times average discharge capacity of the cell employing positive electrolyte with 1% GO is 9.8% higher than the blank one, and the capacity retention(85.30%) and average energy efficiency(79.26%) are both superior to the blank one(79.40% and 75.35%).更多还原