Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7707171 | International Journal of Hydrogen Energy | 2018 | 9 Pages |
Abstract
In this study, activated polymer-based hard carbons were prepared using various steam activation conditions in order to enhance their hydrogen storage ability. The structural characteristics of the activated carbons were observed by X-ray diffraction and Raman spectroscopy. The N2 adsorption isotherm characteristics at 77Â K were confirmed by Brunauer-Emmett-Teller, Barrett-Joyner-Halenda and non-local density functional theory equations. The hydrogen storage behaviours of the activated carbons at 298Â K and 10Â MPa were studied using a Pressure-Composition-Temperature apparatus. From the results, specific surface areas and total pore volume of the activated carbons were determined to be 1680-2320Â m2/g and 0.78-1.39Â cm3/g, respectively. It was also observed that various pore size distributions were found to be dependent on the functions of activation time. In the observed result, the hydrogen adsorption of APHS-9-4 increased about 30% more than that of as-prepared hard carbon. This indicates that hydrogen storage capacity could be a function not only of specific surface area or total pore volume, but also of micropore volume fraction in the range of 0.63-0.78Â nm of adsorbents.
Related Topics
Physical Sciences and Engineering
Chemistry
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Authors
Hye-Min Lee, Young-Jung Heo, Kay-Hyeok An, Sang-Chul Jung, Dong Chul Chung, Soo-Jin Park, Byung-Joo Kim,