Investigation of the Pore Structure of Exfoliated Graphite Based on Highly Oriented Pyrolytic Graphite Nitrate

A. V. Krautsou; Кравцов А. В.; O. N. Shornikova; Шорникова О. Н.; A. I. Bulygina; Булыгина А. И.; A. B. Solopov; Солопов А. Б.; A. L. Kustov; Кустов А. Л.; V. V. Avdeev; Авдеев В. В.

doi:10.31857/S0044453723060122

Investigation of the Pore Structure of Exfoliated Graphite Based on Highly Oriented Pyrolytic Graphite Nitrate

Authors: Krautsou A.V.¹, Shornikova O.N.¹, Bulygina A.I.¹, Solopov A.B.², Kustov A.L.¹, Avdeev V.V.¹
Affiliations:
1. Department of Chemistry, Moscow State University
2. Topchiev Institute of Petrochemical Synthesis, Russian Academy of Sciences
Issue: Vol 97, No 6 (2023)
Pages: 827-835
Section: СТРОЕНИЕ ВЕЩЕСТВА И КВАНТОВАЯ ХИМИЯ
Submitted: 27.02.2025
Published: 01.06.2023
URL: https://rjonco.com/0044-4537/article/view/668728
DOI: https://doi.org/10.31857/S0044453723060122
EDN: https://elibrary.ru/JIJQQW
ID: 668728

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Abstract

Graphite intercalated compounds (GICs) with different stage numbers were prepared from highly oriented pyrolytic graphite (HOPG) and nitric acid using a chemical method. Exfoliated graphite (EG-T) was synthesized from GICs by water treatment followed by thermal shock. The effects of the graphite oxidation depth on the EG-T thermal expansion coefficient, volatile content, and total porosity were examined. However, the main purpose of this work was investigation of the dependence of the inner EG-T pore structure on the level of oxidation. Thus, we studied the micro- and mesopore structure and specific surface area by nitrogen porosimetry and the modern 2D-NLDFT method to calculate the pore size distribution and pore volume. As well, we performed a mercury porosimetry experiment to determine the macropore characteristics. We examined the pore space using a number of scanning electron micrographs of EG-T particle cross-sections using an image processing technique. In this way we showed the strong correlation between the EG-T pore structure parameters and oxidation depth of graphite.

Keywords

exfoliated graphite, expandable graphite, HOPG, pore structure, 2D-NLDFT, MDFT

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