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 Photo-electron 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 167kJ/mol (1.73 eV/atom).
Highlights
Due to its excellent electrical, mechanical, and thermal properties, graphene, a single-atom-thick twodimensional sheet of sp2 bonded carbon, has shown a diverse range of potential applications from fieldeffect transistors to energy-related materials [1,2,3,4,5]
Since all the above mentioned reduction methods are thermal-related and are based on the deoxygenation of oxygen functional groups, the investigation on the thermodynamic state and kinetic process of common thermal reduction will be beneficial to understanding each reduction mechanism of them
The thermodynamic state and kinetic process of the deoxygenation reaction of graphene oxide (GO) are discussed, and the activation energy for GO is estimated based on the experiments
Summary
Due to its excellent electrical, mechanical, and thermal properties, graphene, a single-atom-thick twodimensional sheet of sp2 bonded carbon, has shown a diverse range of potential applications from fieldeffect transistors to energy-related materials [1,2,3,4,5]. Since all the above mentioned reduction methods are thermal-related and are based on the deoxygenation of oxygen functional groups, the investigation on the thermodynamic state and kinetic process of common thermal reduction will be beneficial to understanding each reduction mechanism of them. DSC, TG-MS, and XPS are used to monitor the reaction process with different heating rates and various environmental factors.
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