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Issue 39, 2007
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Mesoporous carbons with KOH activated framework and their hydrogen adsorption

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Abstract

The effects of KOH activation on pore structure of ordered mesoporous carbons were analyzed by transmission electron microscopy, powder X-ray diffraction and argon adsorption. The activation led to remarkable increases in micropore volume and BET surface area up to 1.0 mL g−1 and 2700 m2 g−1, at the expense of the mesostructural order. The resultant carbons with various microporosity and mesoporosity were tested for room-temperature adsorption of hydrogen under high pressure. The adsorption data were analyzed in correlation with the varied carbon pore structures. The results showed that the hydrogen adsorption capacity increased approximately linearly with respect to micropore volume, or BET surface area, reaching a 2.5-times higher value when fully activated. However, the adsorption capacity at 100 atm (0.75 wt%) was still far below the US DOE target of 6.5 wt%. The extrapolation of our results to the carbon structure with the highest possible surface area could lead to no more than 2.5 wt%. This result suggests that chemisorption or other chemical storage methods should be combined with physisorption if carbon materials are considered for hydrogen storage.

Graphical abstract: Mesoporous carbons with KOH activated framework and their hydrogen adsorption

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Publication details

The article was received on 19 Mar 2007, accepted on 29 Jun 2007 and first published on 10 Aug 2007


Article type: Paper
DOI: 10.1039/B704104G
J. Mater. Chem., 2007,17, 4204-4209

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    Mesoporous carbons with KOH activated framework and their hydrogen adsorption

    M. Choi and R. Ryoo, J. Mater. Chem., 2007, 17, 4204
    DOI: 10.1039/B704104G

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