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carried out on a Specs spectrometer, using Mg KR (1253.6 eV) radiation emitted from a double anode at 150 W. UV–Vis absorption spectra were recorded on a spectrophotometer (Shimadzu UV-2401PC). ATR-FTIR spectra were obtained on a Nicolet 3700 spectrometer (Thermo Scientific) using diamond as ATR crystal. The elemental analysis (C, H, N and O) of the samples was carried out on a LECO CHN-932 microanalyzer. Absorption Experiments. The capacity of the graphene aerogel to absorb different organic solvents was determined by weight measurements. Weighed pieces of graphene aerogel (∼ 5-7 mg) were immersed in different organic liquids and taken out using tweezers after 30 seconds. After removing the excess organic liquid from the surface with a cellulose filter paper, the samples were weighed again. The amount of organic liquid absorbed was calculated from the differences in mass. Characterization of the electrochemical supercapacitors: The electrochemical measurements were performed in a two-electrode SwagelokTM type cell using 1 M Li2SO4 as electrolyte. The electrochemical capacitor was assembled using two graphene papers of comparable mass and thickness, electrically isolated by a glassy fibrous separator. The electrochemical characterization which was performed on a computer-controlled potentiostat (Biologic VMP3 multichannel generator) consisted of cyclic voltammetry experiments, electrochemical impedance spectroscopy studies (EIS) and galvanostatic charge/discharge cycling tests (CD). More details about the electrochemical tests and related calculations can be found in the Supporting Information. 19PDF Image | Graphene from Electrochemically Exfoliated Graphite
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