水热法合成石墨烯-锰系化合物及其超级电容性能

摘要

The hydrothermal method was used to study the reaction of citric acid with KMnO4 at relatively low temperatures at the presence of graphene. The influence of molar ratio of KMnO4 to citric acid, morphologies and electrochemical performance of compounds were investigated. The structure and the morphology of samples were characterized by X-ray diffraction(XRD), scanning electron microscopy(SEM) and transmission electron microscopy(TEM). The electrochemical performance of the samples was also tested. The results showed that the MnOOH/ graphene composite with the nanorod structure reacted from the KMnO4 to citric ratio of 8:3 had the best super-capacitance. The specific capacitance could reach 267.7 F/g at a current density of 0.5 A/g with excellent cycle stability.%采用水热法,在石墨烯存在条件下,以柠檬酸为还原剂与KMnO4在相对较低的温度下发生反应,并考察了不同KMnO4与柠檬酸物质的量之比对所得复合物组成、形貌以及电化学性能的影响.采用X射线衍射(XRD),扫描电镜(SEM)和透射电镜(TEM)等对样品的结构和形貌进行了表征,并对电化学性能进行了测试.结果表明,当KMnO4与柠檬酸物质的量之比为8:3时,反应所得纳米棒状结构的MnOOH/石墨烯复合物具有较佳的超电容性能,在0.5 A/g电流密度下的比容量可达267.7 F/g,且具有良好的循环稳定性.