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Three-Dimensional Graphene-Based Macro- and Mesoporous Frameworks for High-Performance Electrochemical Capacitive Energy Storage
journal contribution
posted on 2016-02-20, 04:46 authored by Zhong-Shuai Wu, Yi Sun, Yuan-Zhi Tan, Shubin Yang, Xinliang Feng, Klaus MüllenThree-dimensional graphene-based
frameworks (3D-GFs) with hierarchical
macro- and meso-porous structures are presented. The interconnected
macropores are derived from hydrothermally assembled 3D graphene aerogels
(GAs), while the mesopores are generated by the silica networks uniformly
grown on the surface of graphene. The resulting 3D-GFs exhibit narrow
mesopore size distribution (2–3.5 nm), high surface area, and
low mass density. These intriguing features render 3D-GFs a promising
template for creating various 3D porous materials. Specifically, 3D
GA-based mesoporous carbons (GA-MC) and metal oxide hybrids (GA-Co3O4, GA-RuO2) can be successfully constructed
via a nanocasting technology. Benefiting from the integration of meso-
and macroporous structures, 3D GA-MC manifests outstanding specific
capacitance (226 F g–1), high rate capability, and
excellent cycling stability (no capacitance loss after 5000 cycles)
when it is applied in electrochemical capacitors.
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surface areamesoporouMesoporous FrameworksmaterialframeworkGAmanifestelectrochemical capacitorsElectrochemicalmetal oxide hybridsCapacitive3Ocapacitance lossBenefitingintegrationtemplate5000 cyclesrate capability3 D graphene aerogelsexhibitmacroporous structuresmesoporehydrothermally3 Dmacroporecycling stabilitysilica networksnanocasting technologymass densitynmMacromeso
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