Abstract
Graphene aerogels with high surface areas, ultra-low densities and thermal conductivities have been prepared to exploit their wide applications from pollution adsorption to energy storage, supercapacitor, and thermal insulation. However, the low mechanical properties, poor thermal stability and electric conductivity restrict these aerogels’ applications. In this paper, we prepared mechanically strong graphene aerogels with large BET surface areas, low thermal conductivities, high thermal stability and electric conductivities via hydrothermal reduction and supercritical ethanol drying. Annealing at 1500 °C resulted in slightly increased thermal conductivity and further improvement in mechanical properties, oxidation temperature and electric conductivity of the graphene aerogel. The large BET surface areas, together with strong mechanical properties, low thermal conductivities, high thermal stability and electrical conductivities made these graphene aerogels feasible candidates for use in a number of fields covering from batteries to sensors, electrodes, lightweight conductor and insulation materials.
Highlights
Inorganic[1, 2], carbon[3, 4], and organic aerogels[5] with high porosities and ultra-light weights have been prepared to exploit their wide applications from pollution adsorption to energy storage, catalyst supports, supercapacitor, and thermal insulation[1,2,3,4,5]
Graphene hydrogels were prepared by hydrothermal reduction of graphene oxide (GO) dispersions with the assistance of a mild reducing agent NaHSO3
The GA-S and GA-S-1500C prepared with various concentrations of GO (CGO) were denoted as GA-Sx and GA-Sx-1500C, where x is the concentration of GO dispersion in milligram per milliliter
Summary
Inorganic[1, 2], carbon[3, 4], and organic aerogels[5] with high porosities and ultra-light weights have been prepared to exploit their wide applications from pollution adsorption to energy storage, catalyst supports, supercapacitor, and thermal insulation[1,2,3,4,5]. We prepared mechanically strong graphene aerogels with large BET surface areas, low thermal conductivities, high thermal stability and electric conductivities via hydrothermal reduction and supercritical ethanol drying. Annealing at 1500 °C resulted in slightly increased thermal conductivity and further improvement in mechanical properties, oxidation temperature and electric conductivity of the graphene aerogel. The large BET surface areas, together with strong mechanical properties, low thermal conductivities, high thermal stability and electrical conductivities made these graphene aerogels feasible candidates for use in a number of fields covering from batteries to sensors, electrodes, lightweight conductor and insulation materials
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