The Concentration of C(sp3) Atoms and Properties of an Activated Carbon with over 3000 m2/g BET Surface Area.

Yury M Shulga,Yury M Shulga,Gennady L Gutsev,Vitaly I Korepanov,Alexandr V Melezhik,Eugene N Kabachkov,Eugene N Kabachkov,Aleksei G Tkachev,Dmitry Y Kovalev,Igor I Khodos

doi:10.3390/nano11051324

Abstract

The alkaline activation of a carbonized graphene oxide/dextrin mixture yielded a carbon-based nanoscale material (AC-TR) with a unique highly porous structure. The BET-estimated specific surface area of the material is 3167 m2/g, which is higher than the specific surface area of a graphene layer. The material has a density of 0.34 g/cm3 and electrical resistivity of 0.25 Ω·cm and its properties were studied using the elemental analysis, transmission electron microscopy (TEM), electron diffraction (ED), X-ray diffraction (XRD), Raman spectroscopy, X-ray photoelectron spectroscopy (XPS), X-ray induced Auger electron spectroscopy (XAES), and electron energy loss spectroscopy (EELS) in the plasmon excitation range. From these data, we derive an integral understanding of the structure of this material. The concentration of sp3 carbon atoms was found to be relatively low with an absolute value that depends on the measurement method. It was shown that there is no graphite-like (002) peak in the electron and X-ray diffraction pattern. The characteristic size of a sp2-domain in the basal plane estimated from the Raman spectra was 7 nm. It was also found that plasmon peaks in the EELS spectrum of AC-TR are downshifted compared to those of graphite.

Highlights

Activated carbons (AC) with high specific surface areas (SSA) are very important for a wide range of industrial applications where they are used as adsorbents for solvents, vapors and pollutants [1,2,3,4]
This work is aimed at a systematic study of the structure of an AC material obtained via an efficient industry-level approach from a graphene oxide/dextrin precursor with carbonization and alkaline activation
Specific surface area of the sample under study was calculated by the BET method to This value higher theispreviously reported values ofreported activatedvalues carbonof(1000–2000 be 3167

Summary

Introduction

Activated carbons (AC) with high specific surface areas (SSA) are very important for a wide range of industrial applications where they are used as adsorbents for solvents, vapors and pollutants [1,2,3,4]. Their electric conductivity makes them highly promising electrodes for supercapacitors in energy storage applications [5,6,7], and as fillers for thermally conductive polymer composites [8,9,10].

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