Issue 2, 2021

Hard carbon porosity revealed by the adsorption of multiple gas probe molecules (N2, Ar, CO2, O2 and H2)

Abstract

The porosity of hard carbon materials is usually assessed by nitrogen adsorption, which can lead to apparently non-porous materials and misleading interpretation of sodium storage in Na-ion batteries. Herein, a series of complementary gases (N2, Ar, CO2, O2 and H2) were used to reveal the porosity of hard carbons. In particular, unconventional gases, such as H2 and O2, showed significantly higher adsorbed volumes and specific surface areas than N2, Ar or even CO2. Notably, O2 was the only gas able to access both the ultramicropores (d < 0.7 nm) and supermicropores (0.7 < d < 2.0).

Graphical abstract: Hard carbon porosity revealed by the adsorption of multiple gas probe molecules (N2, Ar, CO2, O2 and H2)

Supplementary files

Article information

Article type
Communication
Submitted
15 Oct 2020
Accepted
18 Dec 2020
First published
11 Jan 2021

J. Mater. Chem. A, 2021,9, 937-943

Hard carbon porosity revealed by the adsorption of multiple gas probe molecules (N2, Ar, CO2, O2 and H2)

A. Beda, C. Vaulot and C. Matei Ghimbeu, J. Mater. Chem. A, 2021, 9, 937 DOI: 10.1039/D0TA10088A

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