Electrolyte and composition effects on the performances of asymmetric supercapacitors constructed with Mn3O4 nanoparticles–graphene nanocomposites
Electrolyte and composition effects on the performances of asymmetric supercapacitors constructed with Mn3O4 nanoparticles–graphene nanocomposites
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DOI：
10.1016/j.jpowsour.2013.07.118
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发表时间：
2014-01
影响因子：
9.2
通讯作者：
Yuanhua Xiao;Yongbo Cao;Yuyin Gong;A. Zhang;Ji-hong Zhao;S. Fang;Dianzeng Jia;Feng Li
中科院分区：
文献类型：
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作者：
Yuanhua Xiao;Yongbo Cao;Yuyin Gong;A. Zhang;Ji-hong Zhao;S. Fang;Dianzeng Jia;Feng Li
Mn3O4 纳米颗粒和石墨烯 (GR) 纳米片的纳米复合材料 – Mn3O4@GR 可以通过在溶剂热反应中直接在 GR 表面生长 Mn3O4 纳米颗粒来制备。分别以Mn3O4@GR作为正极和活性炭（AC）作为负极构建的不对称超级电容器显示出高度增强的储能性能。研究发现，用于构建器件电极的电解质可以显着影响 Mn3O4@GR 超级电容器的性能。与 KOH 电解质中的能量密度相比，这些器件在 Na2SO4 电解质中表现出改进的电荷存储性能。此外，器件的电荷存储能力与GR纳米片表面负载的Mn3O4纳米颗粒的数量密切相关。 Mn3O4@GR//AC非对称超级电容器的性能可以通过仔细调整电极材料的成分和调整制造设备的电解质来优化。
Nanocomposites of Mn3O4nanoparticles and graphene (GR) nanosheets – Mn3O4@GR can be made by growing Mn3O4nanoparticles directly on the surfaces of GR in solvothermal reactions. The asymmetric supercapacitors constructed with Mn3O4@GR as positive and activated carbon (AC) as negative electrodes, respectively, show highly enhanced performances in energy storage. It was found that the electrolytes employed in constructing electrodes of the devices can influence the performances of Mn3O4@GR supercapacitors dramatically. Compared to their energy density in KOH electrolyte, the devices exhibit improved charge storage performances in Na2SO4electrolyte. Furthermore, the charge storage abilities of the devices are closely related to the amount of Mn3O4nanoparticles loaded onto the surface of GR nanosheets. The performances of Mn3O4@GR//AC asymmetric supercapacitors can be optimized by carefully tailoring the composition of electrode materials and adjusting the electrolytes for making the devices.