화학공학소재연구정보센터
홈 로그인 로그아웃 연락처 사이트맵
Journal of Industrial and Engineering Chemistry, Vol.15, No.5, 730-735, September, 2009
DOI10.1016/j.jiec.2009.09.054  Export Citation
Temperature and alkaline hydroxide treatment effects on hydrogen sorption characteristics of multi-walled carbon nanotube-graphite mixture
Turkan Kopac†, and Fatma Oguz Erdogan
  • Department of Chemistry, Zonguldak Karaelmas University, 67100 Zonguldak, Turkey.
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Temperature and alkaline hydroxide treatment effects on the surface area and pore structure of the cathode deposit multi-walled carbon nanotube (MWCNT)-graphite mixture were investigated in a temperature range of 600-800 ℃. Hydrogen sorption properties of the MWCNT-graphite mixture samples were studied by varying the alkaline hydroxide-activation temperature. Pore characterization of modified MWCNT-graphite mixture was performed with the observation of adsorption-desorption isotherms of N2 at 77 K. Hydrogen sorption of the non-treated and treated MWCNT-graphite mixture was carried out using a volumetric apparatus at 77 K. The highest surface area of the sample was obtained as 275 m2 g^(-1) by treatments with KOH at 600 ℃. The increase in the specific surface area of MWCNT-graphite sample mixture was about 13 times. Themaximum amount of hydrogen adsorbed on the MWCNT-graphite sample mixture was found as 0.75 and 0.54 wt.% by chemical treatments with KOH at 600 ℃ and NaOH at 700 ℃, respectively whereas it was 0.01 wt.% for the original sample. The hydrogen sorption capacity was enhanced considerably by KOH treatments at 600 ℃.
Keywords:MWCNT;Alkali treatment;Adsorption isotherms;Chemical activation;Hydrogen sorption
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