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Oxygen-rich microporous carbons with exceptional hydrogen storage capacity

Blankenship, Troy Scott; Balahmar, Norah; Mokaya, Robert

Oxygen-rich microporous carbons with exceptional hydrogen storage capacity Thumbnail


Troy Scott Blankenship

Norah Balahmar

Robert Mokaya


Porous carbons have been extensively investigated for hydrogen storage but, to date, appear to have an upper limit to their storage capacity. Here, in an effort to circumvent this upper limit, we explore the potential of oxygen-rich activated carbons. We describe cellulose acetatederived carbons that combine high surface area (3800 m2 g-1) and pore volume (1.8 cm3 g-1) that arise almost entirely (> 90%) from micropores, with an oxygen-rich nature. The carbons exhibit enhanced gravimetric hydrogen uptake (8.1 wt% total, and 7.0 wt% excess) at -196 ºC and 20 bar, rising to a total uptake of 8.9 wt% at 30 bar, and exceptional volumetric uptake of 44 g l-1 at 20 bar, and 48 g l-1 at 30 bar. At room temperature they store up to 0.8 wt% (excess) and 1.2 wt% (total) hydrogen at only 30 bar, and their isosteric heat of hydrogen adsorption is above 10 kJ mol-1.

Journal Article Type Article
Acceptance Date Oct 5, 2017
Online Publication Date Nov 16, 2017
Deposit Date Nov 20, 2017
Publicly Available Date Nov 20, 2017
Journal Nature Communications
Electronic ISSN 2041-1723
Publisher Nature Publishing Group
Peer Reviewed Peer Reviewed
Volume 8
Article Number 1545
Keywords hydrogen storage materials; materials chemistry; porous materials
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