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Energy & Environmental Science Vol -2

Energy & Environmental Science Vol -1

Superactivated carbide-derived carbons with high hydrogen storage capacity

Content Provider	Royal Society of Chemistry (RSC)
Author	Mokaya, Robert Sevilla, Marta Foulston, Richard
Copyright Year	2010
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.
Starting Page	223
Ending Page	227
Page Count	5
File Format	HTM / HTML PDF
ISSN	17545692
Volume Number	3
Issue Number	2
Journal	Energy & Environmental Science
DOI	10.1039/b916197j
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	CDC KOH Carbide-derived carbon Porosity Hydrogen Activated carbon Oxygen
Content Type	Text
Resource Type	Article
Subject	Environmental Chemistry Pollution Renewable Energy, Sustainability and the Environment Nuclear Energy and Engineering

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