Investigation of Hydrogen Physisorption Active Sites on the Surface of Porous Carbonaceous Materials

Abstract

Hydrogen physisorption in different carbonaceous materials was investigated in liquid nitrogen (77 K). The total hydrogen adsorption was found to have a linear relationship with the surface area of pores <30 A. The surface area and porosity of the carbon materials were determined by dinitrogen adsorption at 77 K and density function theory (DFT). The active sites for hydrogen adsorption were investigated and found to be related to the edge orientation of defective graphene micro-sheet domains.

Capture and reversible storage of volatile iodine by porous carbon with high capacity

“…The peak at 1605 cm -1 (G-band) is common to all sp 2 carbon systems and closely related to E2g mode of graphite. The other peak at 1340 cm -1 (D-band) suggests the presence of disorder in carbonaceous materials [22,27]. Quantifying disorder in carbon materials is usually made by analyzing the intensity ratio between the D-band and G-band (I D /I G ) [28].…”

Superhydrophobic Activated Carbon‐Coated Sponges for Separation and Absorption

“…As demonstrated in a previous study, R values decrease with the increase of single-layer content in carbon samples. [26] Thus, a larger R value means a relatively higher degree of graphitization and a larger concentration of parallel single carbon layers in the materials. Apparently, in this case, the R value of AK 1 decreases after KOH activation, implying a decrease in crystallinity and a lower degree of graphitization of AK 1 relative to that of activated carbon, which may be attributed to the breakdown of aligned structural domains in the carbon matrix because of the intercalation of potassium compounds and the oxidation of carbon into carbonate.…”

Enhanced supercapacitive performance of porous activated carbon derived from polyaniline prepared by electrochemical synthesis

“…single-layer content of the carbon increases [19]. The R values are 2.8 and 2.2 for CC and AC, respectively.…”