| 초록 |
In recent years, nanoporous materials with high specific surface areas and porosity have been developed to meet the commercial demands of hydrogen storage systems. In this work, we used Ketjenblack (KB) as a precursor for the production of porous carbon by chemical activation with KOH. KB materials are of great interest because of their lower oxygen content and higher porosity when compared to other porous carbon materials. Activated Ketjenblack (AKB) materials have high specific surface areas (up to 1891 m2 g-1) and various pore sizes (0.46–0.66 nm) in the ultramicropore range. These AKBs achieved hydrogen storage capacities of up to 2.1 wt.% at 1 bar and 77 K, and large heat of adsorption values of up to 8.7 kJ mol-1. The interaction between hydrogen and the carbon surface was more closely related to the porosity than to the surface oxygen content. Among the textural properties of the samples, the pore size and volume were found to be the key factors affecting hydrogen adsorption. |
