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http://dx.doi.org/10.12925/jkocs.2005.22.1.7

Characterization of Activation of Various Carbon Fibers via Chemical Activation with KOH  

Lim, Yun-Soo (Department of Materials Science and Engineering, Myongji University)
Moon, Sook-Young (Department of Materials Science and Engineering, Myongji University)
Han, Dong-Yun (Department of Materials Science and Engineering, Myongji University)
Lee, Byung-Ha (Department of Materials Science and Engineering, Myongji University)
Publication Information
Journal of the Korean Applied Science and Technology / v.22, no.1, 2005 , pp. 43-49 More about this Journal
Abstract
OXI-PAN fibers, Kynol fibers and rayon fibers were used as precursorsfor the preparation of activated carbon fibers (ACFs) by chemical activation with KOH at $800^{\circ}C$. The effects of different precursorfibers and fiber/KOH ratios on the final ACFs are discussed. The precursor fibers used are appropriate for the ACFs in a single stage pyrolysis process. The OXI-PAN fibers which were activated with KOH of 2.0M showed a specific surface area of $2328m^2/g$ however, loosed the fiber shape because of low yields. The Kynol fibers and Rayon fibers showed the high yields but the lower specific surface area of $900m^2/g$ and $774m^2/g$, respectively, at KOH of 1.5M. The OXI-PAN fibers which were activated with KOH of 1.5M have a specific surface area of $1028m^2/g$ and higher micro-pore volumes and lower yields rather than Kynol-1.5 and Rayon-1.5 samples. This phenomenon is because of higher chemical resistance of the Kynol and Rayon fibers rather than OXI-PAN fibers. However, the Kynol fibers were the best precursors on KOH activation at $800^{\circ}C$ considered carbon yields, surface areas and micropore volumes.
Keywords
activated carbon fibers; chemical activation; carbon fibers;
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