Abstract
We reported a simple and effective way of fabricating one-dimensional (1D) graphene oxide nanoscrolls (GONS) from graphene oxide (GO) sheets through shock cooling by liquid nitrogen. The corresponding mechanism of rolling was proposed. One possibility is the formation of ice crystals during the shock cooling process in liquid nitrogen to be the driving force. The other might be due to the uneven stress of the sheets inside or outside ice during the lyophilization. After reducing, graphene nanoscrolls (GNS) exhibited good structural stability, high specific surface area, and high specific capacitance. The capacitance properties were investigated by cyclic voltammetry, galvanostatic charge-discharge, and electrical impedance spectroscopy. A specific capacity of 156 F/g for the GNS at the current density of 1.0 A/g was obtained comparing with the specific capacity of 108 F/g for graphene sheets. Those results indicated that GNS-based rolling structure could be a kind of promising electrode material for supercapacitors and batteries.
Highlights
Graphene was one-atom-thick carbon material with remarkable electronic, mechanical, and thermal properties [1,2]
We reported the graphene oxide nanoscrolls (GONS) of a distinct form of 1D tubular graphene architecture, which fabricated by shock cooling of aqueous graphene oxide (GO) dispersion by liquid nitrogen
We found that graphene nanoscrolls (GNS) demonstrated more rectangular cyclic voltammetry (CV) area than reduced graphene oxide (rGO), which further supporting the suggestion of highly capacitive nature and rapid charge-discharge behavior [29]
Summary
Graphene was one-atom-thick carbon material with remarkable electronic, mechanical, and thermal properties [1,2] It can be viewed as a fundamental two-dimensional (2D) building block for an array of nanostructures. Graphene nanosheets were crumpled into ball-like structures by Another interesting one-dimensional (1D) tubular structure, CNS were formed by rolling up of flat graphite thin nanoplates [12], attracted intensive investigations as well. Due to their hybrid topology, CNS were expected to possess some unique physiochemical properties distinct from those of graphene and carbon nanotubes (CNTs)
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