A study on optimal pore range for high pressure hydrogen storage behaviors by porous hard carbon materials prepared from a polymeric precursor. (15th March 2018)

• Record Type: Journal Article
• Authors: Lee, Hye-Min; Heo, Young-Jung; An, Kay-Hyeok; Jung, Sang-Chul; Chung, Dong Chul; Park, Soo-Jin; Kim, Byung-Joo
• Is Part Of: International journal of hydrogen energy. Volume 43:Number 11(2018)
• Page Start: 5894
• Page End: 5902
• Publication Date: 2018-03-15
• Subjects: Activated hard carbon -- Hydrogen storage -- Pore structure -- Steam activation; Hydrogen as fuel -- Periodicals; Hydrogène (Combustible) -- Périodiques; Hydrogen as fuel; Periodicals; 665.81
• DOI: 10.1016/j.ijhydene.2017.09.085
• Languages: English
• ISSNs: 0360-3199

Abstract

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 77 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 298 K and 10 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 1680–2320 m 2 /g and 0.78–1.39 cm 3 /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 0.63–0.78 nm of adsorbents. Highlights: The pore development mechanism of activated carbons has been revealed. Steam activation has the effect of removing disordered structure. Activated carbons showed enhanced specific surface area from 1680 to 2320 m 2 /g. It was correlated the hydrogen adsorption capacity with micropore volume.