Hydrogen adsorption by perforated graphene
2015 (English)In: International journal of hydrogen energy, ISSN 0360-3199, E-ISSN 1879-3487, Vol. 40, no 20, 6594-6599 p.Article in journal (Refereed) Published
We performed a combined theoretical and experimental study of hydrogen adsorption in graphene systems with defect-induced additional porosity. It is demonstrated that perforation of graphene sheets results in increase of theoretically possible surface areas beyond the limits of ideal defect-free graphene (∼2700 m2/g) with the values approaching ∼5000 m2/g. This in turn implies promising hydrogen storage capacities up to 6.5 wt% at 77 K, estimated from classical Grand canonical Monte Carlo simulations. Hydrogen sorption was studied for the samples of defected graphene with surface area of ∼2900 m2/g prepared using exfoliation of graphite oxide followed by KOH activation. The BET surface area of studied samples thus exceeded the value of single-layered graphene. Hydrogen uptake measured at 77 K and 296 K amounts to 5.5 wt% (30 bar) and to 0.89 wt% (120 bar), respectively.
Place, publisher, year, edition, pages
Elsevier, 2015. Vol. 40, no 20, 6594-6599 p.
Graphene-based nanostructures, Hydrogen storage, High surface area, Porous materials
IdentifiersURN: urn:nbn:se:umu:diva-104374DOI: 10.1016/j.ijhydene.2015.03.139ISI: 000354581100013OAI: oai:DiVA.org:umu-104374DiVA: diva2:839844