石墨烯-二氧化锰复合材料的制备及其在超级电容器中的应用

Preparation and Application of Graphene-Manganese Dioxide Composites in Supercapacitors

以氧化石墨烯为碳源,二氧化锰的前驱体创新性地以Na_(2)SO_(3)为还原剂与KMnO_(4)反应,通过原位复合法制备了石墨烯-二氧化锰复合材料(H-RGO-MnO_(4))。采用XRD、SEM、TEM、EDS和XPS对复合材料进行微观结构表征。结果表明:在H-RGO-MnO_(4)复合材料中,石墨烯纳米片层与MnO_(4)纳米片层紧密结合在一起,且MnO_(2)在复合材料中分布均匀。基于该复合材料构建的超级电容器电化学性能优良,在0.5 A·g^(-1)时的比电容为270.6 F·g^(-1);从0.5 A·g^(-1)到5 A·g^(-1),表现出优异的倍率性(89.4%);在5 A·g^(-1)时循环13000次后,比电容保持率为96%。

Graphene-manganese dioxide composites(H-RGO-MnO_(4))were prepared using an in situ composite method with graphene oxide as carbon source as well as innovative reductant Na_(2)SO_(3)and KMnO_(4)as oxidant,respectively.The microstructure of H-RGO-MnO_(4)was respectively characterized by XRD,SEM,TEM,EDS and XPS.It was found that MnO_(4)nanosheets distributed uniformly in graphene sheets and were closely combined with them.When it was used as the active electrode materials in supercapacitors,H-RGO-MnO_(2)composites exhibited high specific capacitance(270.6 F·g^(-1)at 0.5 A·g^(-1)),and excellent rate performance(89.4%,from 0.5 A·g^(-1)to 5 A·g^(-1)),as well as retained 96%capacitance after 13000 cycles at 5 A·g^(-1).