Chemically activated fungi-based porous carbons for hydrogen storage

A set of porous carbons has been prepared by chemical activation of various fungi-based chars with KOH. The resulting carbon materials have high surface areas (1600–2500m2/g) and pore volumes (0.80–1.56cm3/g), regardless of the char precursors. The porosities mainly derived from micropores in activa...

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Bibliographic Details
Published in:Carbon (New York) 2014-08, Vol.75, p.372-380
Main Authors: Wang, Jiacheng, Senkovska, Irena, Kaskel, Stefan, Liu, Qian
Format: Article
Language:English
Subjects:
Adsorbents
Alternative fuels. Production and utilization
Applied sciences
Chemistry
Colloidal state and disperse state
Condensed matter: structure, mechanical and thermal properties
Energy
Exact sciences and technology
Fuels
General and physical chemistry
High-pressure and shock-wave effects in solids and liquids
Hydrogen
Mechanical and acoustical properties of condensed matter
Physics
Porous materials
Surface physical chemistry
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Summary:A set of porous carbons has been prepared by chemical activation of various fungi-based chars with KOH. The resulting carbon materials have high surface areas (1600–2500m2/g) and pore volumes (0.80–1.56cm3/g), regardless of the char precursors. The porosities mainly derived from micropores in activated carbons strongly depend on the activation parameters (temperature and KOH amount). All activated carbons have uniform micropores with pore size of 0.8–0.9nm, but some have a second set of micropores (1.3–1.4nm pore size), further broadened to 1.9–2.1nm as a result of increasing either the activation temperature to 750°C or KOH/char mass ratio to 5/1. These fungi-based porous carbons achieve an excellent H2 uptake of up to 2.4wt% at 1bar and −196°C, being in agreement with results from other porous carbonaceous adsorbents reported in the literature. At high pressure (ca. 35bar), the saturated H2 uptake reaches 4.2–4.7wt% at −196°C for these fungi-based porous carbons. The results imply a great potential of these fungi-based porous carbons as H2 on-board storage media.
ISSN:0008-6223
1873-3891
DOI:10.1016/j.carbon.2014.04.016