Journal
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
Volume 38, Issue 22, Pages 9243-9250Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijhydene.2013.04.163
Keywords
Corncob; Activated carbon; Pore structure; Hydrogen storage; KOH activation
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Funding
- National High Technology Research and Development Program of China (863 Program) [2012AA053305]
- International Cooperation Project from Ministry of Science and Technology of China [2010DFA64080]
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A series of super activated carbon have been prepared by potassium hydroxide activation of corncob. The as-obtained samples were characterized by SEM, TEM and N-2-sorption. The results show morphologies and textural of activated carbon are highly depended on the activation temperature, heating rate, whereas the activation time is not a key factor. Morphologies and porous structure of activated carbons can be regulated by adjusting preparation parameters. A super activated carbon with BET surface area of 3530 m(2)/g and total pore volume of 1.94 cm(3)/g is obtained. However, the other activated carbon with smaller pore size exhibited the highest hydrogen uptake capacities exceeding 2.85 wt% at -196 degrees C and 1.0 bar, whose BET surface area is only 2988 m(2)/g. The correlation investigations show the micropore volume between 0.65 nm and 1.5 nm can be more important than BET surface area and total pore volume for hydrogen uptakes at -196 degrees C. The present results indicate that the corncob-derived activated carbons can be promising materials for hydrogen storage. Copyright (C) 2013, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.
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