Absorption of atomic and molecular species in carbon cellular structures (Review article)

Abstract

The paper presents a brief review of the recent developments in the field of absorption of atomic and molecular species in carbon cellular structures. Such absorbing objects can be distinctly recognized among a large family of carbon porous materials owing to potential and already observed in experiments very high capacity to soak and to keep inside different substances, which at usual conditions outside the porous matrices may often stay only in a gaseous form. High capacity filling is attained owing to single graphene-like walls separating different cells in the whole structures providing their lightweight. This property of cellular structures makes them very promising for numerous technological applications such as hydrogen storage in fuel cells and molecular sieving in membranes made from such structures or for their usage in microelectronics, photovoltaics and production of Li-ion batteries. Independently of the targeted applications gases are good candidates for probing tests of carbon matrices themselves.

Selective uptake and desorption of carbon dioxide in carbon honeycombs of different sizes

“…CHs already demonstrated high capturing ability with respect to different gases including CO 2 . 7,8,[11][12][13] In our preliminary research, 13 we have found that the CO 2 uptake in CHs is very strong and the complete desorption of carbon dioxide captured in the carbon honeycomb matrix does not occur, even at high enough temperatures. This means that CHs used as membranes are very promising materials for CO 2 capturing.…”

“…In order to study any gas sorption in CHs, we developed and tested the specific procedure, enabled us to fill nearly fully all available positions inside CHs. 7,8,[10][11][12] In this method, we first make deposition of gases at low temperatures below the known gas sublimation points, and then heat gradually our condensates till the temperatures 2-3 degrees lower these points and keep deposited gases at these temperatures for several minutes monitoring the electron diffraction patterns. Typically, the well-defined peaks from polycrystalline gas deposits disappear, but distinct residual signals left showing that some kind of composites based on CHs with sorbed gases form.…”

“…9,10 In these structures, in particular, double adsorption of different species is possible as compared with graphene and carbon nanotubes due to the openness of both sides of the internal graphene-like walls of cellular channels that offer unique potential for many energy-related applications, in particular for hydrogen storage. 11 Nowadays, along with the energy needs, equally important problem is to clean our environment from industrial and anthropogenic pollutants. One of such "pollutant" is carbon dioxide causing along with general harmful impact also gradual heating of the Earth atmosphere.…”

Tensile and Compressive Behavior of CHC‐Reinforced Copper using Molecular Dynamics

“…These graphene nanoribbons form the "walls" of periodic hexagonal cells in a 3D structure that resembles a honeycomb. CHCs were first theorized by Karfunkel and Dressler in 1992, [7] but only in 2016 were they experimentally synthetized by Krainyukova et al [8] from the deposition of vacuum-sublimated graphite.CHC's unique properties, such as high sorption and storage capacities, [9][10][11][12] membrane sieving, [13] high thermal conductivity, [14][15][16][17] or superior mechanical energy absorbing capacity [18] ), have been predicted mostly by first principles and molecular dynamics (MD) methods. The latter methods were also used to explore in detail the mechanical properties of CHCs.Using first principles, Pang et al [19] demonstrated that CHCs have high tensile strength depending on cell size and show a marked anisotropic Poisson's ratio effect.…”

“…CHC's unique properties, such as high sorption and storage capacities, [9][10][11][12] membrane sieving, [13] high thermal conductivity, [14][15][16][17] or superior mechanical energy absorbing capacity [18] ), have been predicted mostly by first principles and molecular dynamics (MD) methods. The latter methods were also used to explore in detail the mechanical properties of CHCs.…”