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Issue 2, 2010
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Superactivated carbide-derived carbons with high hydrogen storage capacity

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Abstract

Activation of carbide-derived carbon (CDC) with KOH generates superactivated carbons with high surface area (up to 2800 m2 g−1). The KOH activation, at a CDC/KOH weight ratio of 1 : 4, was performed at between 600 and 900 °C. Despite a 50% increase in porosity, the activated carbons retain a microporous nature with typically 90% of their surface area and 80% of their pore volume arising from micropores. The small micropores (8–12 Å) of the CDC are retained in the activated carbons, along with the generation of a greater proportion of new 20 Å pores. The size of the larger pores increases slightly at higher activation temperature. The activated carbons exhibit an enhancement of up to 63% in hydrogen uptake from 3.8 wt% for the CDC to 6.2 wt% at −196 °C and 20 bar. At 1 bar the superactivated CDC carbons store 2.7 wt% hydrogen, which is amongst the highest values ever reported for activated carbon. An increase in surface oxygen concentration also contributes to the enhanced hydrogen uptake. For example, activation at 600 °C does not alter the textural properties, but enhances hydrogen uptake by ca. 30% compared to the CDC due to an apparent higher surface oxygen concentration.

Graphical abstract: Superactivated carbide-derived carbons with high hydrogen storage capacity

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Publication details

The article was received on 06 Aug 2009, accepted on 25 Sep 2009 and first published on 22 Oct 2009


Article type: Paper
DOI: 10.1039/B916197J
Energy Environ. Sci., 2010,3, 223-227

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    Superactivated carbide-derived carbons with high hydrogen storage capacity

    M. Sevilla, R. Foulston and R. Mokaya, Energy Environ. Sci., 2010, 3, 223
    DOI: 10.1039/B916197J

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