Self-assembled graphene films with various thicknesses as supercapacitor electrodes
首发时间:2020-06-10
Abstract:In this paper,Graphene have attracted considerable attention as the supercapacitor material due to its high electronic conductivity and large ion-accessible surface area. Herein, self-assembled reduced grapheneoxide (rGO) films with various controllable thicknesses and mass loadings are facilely prepared via a scalable vacuum filtration method. The rGO film electrodes with considerable mass loading of 6.7 mg cm-2 exhibit high specific capacitance of 173.4 F g-1 (1.16 F cm-2) at 1 A g-1 in 6 M KOH aqueous electrolyte, indicating the high utilization of the rGO active material. Moreover, quasi-solid supercapacitors fabricated with the rGO film electrode and PVA/KOH gel electrolyte shows a high capacitance of 1.03 F cm-2 and a large energy density of 0.073 mWh cm-2 at the power density of 3.3 mW cm-2, as well as excellent cycling stability of 85.6% retention after 10000 cycles. Such remarkable performance suggests that the rGO films are promising electrode materials for supercapacitor application.
keywords: Electrochemical engineering Reduced graphene oxide self-assembled film electrode thickness quasi-solid supercapacitor
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厚度可调的自组装石墨烯薄膜电极的超级电容性能研究
摘要:石墨烯作为超级电容器材料,因其高导电性和较大的离子接触比表面积,引起了人们的广泛关注。在这里,通过可升级的真空过滤方法,简单地制备了具有各种可控制厚度和质量负荷的自组装还原氧化石墨烯(rGO)薄膜。质量负荷为6.7mg cm-2的rGO薄膜在 6 M KOH 水电解质中的比电容为173.4 F g-1 (1.16 F cm-2),表明rGO活性物质利用率高。 此外,用rGO膜电极和PVA/KOH凝胶电解质制备的准固体超级电容器在功率密度为3.3 mW cm-2 时,具有1.03 F cm-2 的高电容和0.073 mWh cm-2 的大能量密度,以及优良的循环稳定性,10000次循环后保留率为85.6%。这种优异的性能表明,rGO薄膜是一种很有前途的超级电容器电极材料。
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厚度可调的自组装石墨烯薄膜电极的超级电容性能研究
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