Thermodynamic and Kinetic Analysis of Lowtemperature Thermal Reduction of Graphene Oxide

Abstract

Abstract:The thermodynamic state and kinetic process of low-temperature deoxygenation reaction of graphene oxide (GO) have been investigated for better understanding on the reduction mechanism by using Differential Scanning Calorimetry (DSC), Thermogravimetry-Mass Spectrometry (TG-MS), and X-ray Photoelectron Spectroscopy (XPS). It is found that the thermal reduction reaction of GO is exothermic with degassing of CO2, CO and H2O. Graphene is thermodynamically more stable than GO. The deoxygenation reaction of GO is kinetically controlled and the activation energy for GO is calculated to be 167 kJ/mol (1.73 eV/atom).

Graphene Oxide-Silica Composite Fillers into the Experimental Dental Adhesives for Potential Therapy

“…[4] Graphene oxide (GO) nanosheets are heavily oxygenated graphene with a great deal of epoxy, hydroxyl, and carboxyl functional groups on its basal planes. [5][6][7][8] These functional groups make them more compatible with organic polymers and perform unique properties in many fields. Nonetheless, more unique and superior properties of GO for material applications continue to be recognized or discovered.…”

Liquid crystalline polymer nanocomposites reinforced with in-situ reduced graphene oxide

“…At the actual state of the art, the easiest way to produce bulk quantities of graphene is based on the reduction of GO [28][29][30]. Thermal reduction of GO has been reported to be very effective in restoring the graphene structure [31,32], but elevated temperatures (i.e. from 300 to 1000°C) are usually required to achieve a complete GO reduction in a reasonable time.…”

ERP study of graphite oxide thermal reduction: the evolution of paramagnetism and conductivity

“…Furthermore, the activation energies values of 38.1 and 32.5 kcal/mol have been reported in another work [15], where thermogravimetric analysis (TGA) data were used for calculations based on diffusion and autocatalytic models for the GO reduction process respectively. In yet another paper [16], an activation energy of 40 kcal/mol has been found based on differential scanning calorimetry (DSC) data interrelating the maximum heat release temperature and the heating rate. Our results are in good agreement with those reported in the literature.…”