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Oxygen-rich microporous carbons with exceptional hydrogen storage capacity

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

Authors

Troy Scott Blankenship

Norah Balahmar

Robert Mokaya



Abstract

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
Journal Nature Communications
Electronic ISSN 2041-1723
Publisher Nature Publishing Group
Peer Reviewed Peer Reviewed
Volume 8
Article Number 1545
APA6 Citation Blankenship, T. S., Balahmar, N., & Mokaya, R. (in press). Oxygen-rich microporous carbons with exceptional hydrogen storage capacity. Nature Communications, 8, https://doi.org/10.1038/s41467-017-01633-x
DOI https://doi.org/10.1038/s41467-017-01633-x
Keywords hydrogen storage materials; materials chemistry; porous materials
Publisher URL https://www.nature.com/articles/s41467-017-01633-x
Copyright Statement Copyright information regarding this work can be found at the following address: http://creativecommons.org/licenses/by/4.0

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Copyright Statement
Copyright information regarding this work can be found at the following address: http://creativecommons.org/licenses/by/4.0





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