Nitrogen adsorption on graphene sponges synthesized by annealing a mixture of nickel and carbon powders
Date
2017
Authors
Grehov, V.
Kalnacs, J.
Mishnev, A.
Kundzins, Karlis
Journal Title
Journal ISSN
Volume Title
Publisher
De Gruyter Open Ltd
Abstract
Adsorption by graphene sponge (GS) manufactured by annealing nickel-carbon powder mixture in inert atmosphere has been studied. By determining the specific surface area (SSA) for the GS sample, it has been found that Brunauer, Emmett, Teller method (BET) of approximation of experimental isotherms gives wrong results in the pressure range of 0.025-0.12 because adsorption in this pressure region is affected by walls of ampoule. Real SSA value has been found by subtracting pore effect method (SPE) or by BET approximation in a low range of relative pressure of 0.0004-0.002.
Description
The present research has been supported by the National Research Programme for 2014–2017 “Multifunctional Materials and Composites, Photonics and Nanotechnologies”.
Keywords
graphene sponge , nitrogen adsorption , specific surface area , BET approximation , Research Subject Categories::NATURAL SCIENCES:Physics