Fabrication of high-quality graphene oxide nanoscrolls and application in supercapacitor

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.

Fabrication and morphology tuning of graphene oxide nanoscrolls

“…† The observed GONS diameters are related to the area of the parent GO flake and the inter-layer separation of the GONS walls. The GONS have an observed interlayer separation on the order of 10-100 nm, 46 as can be seen in Fig. 3a, which is much larger than the inter-layer separation of GNS and CNT (∼0.34 nm).…”

Graphene oxide scroll meshes encapsulated Ag nanoparticles for humidity sensing

“…It is known that encapsulating nanomaterials into GNSs can further improve their performance in the elds of supercapacitor, lithium-ion battery and sensor. [2][3][4][5][6]53,54 Herein, we tried to investigate the performance of GO-Ag scroll meshes on humidity sensing.…”

Graphene Oxide Bulk-Modified Screen-Printed Electrodes Provide Beneficial Electroanalytical Sensing Capabilities

“…Graphene oxide (GO), a two-dimensional oxygenated carbon nanosheet, previously considered by many researchers as solely a precursor for the synthesis of graphene, possesses a number of unique chemical properties that make it a beneficial material in its own right [1][2][3]. Whilst researchers have found niche applications for GO in an array of technologies, such as hydrogen storage [4], supercapacitors [5], and biosensors [6], GO is often overlooked due to its limited application in electrically active devices/materials. This is a result of its reported high electrical resistance that stems from carboxyl, hydroxyl, and epoxy groups located on the periphery of the GO sheet [7].…”