Activation routes for high surface area graphene monoliths from graphene oxide colloids

Graphene monoliths made from graphene oxide colloids by unidirectional freeze-drying method were activated by typical activation processes of CO2 activation, chemical activation using ZnCl2 or H3PO4, and KOH activation. The porosity development of graphene monolith markedly depends on the activation...

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Bibliographic Details
Published in:Carbon (New York) 2014-09, Vol.76, p.220-231
Main Authors: Wang, Shuwen, Tristan, Ferdinando, Minami, Daiki, Fujimori, Toshihiko, Cruz-Silva, Rodolfo, Terrones, Mauricio, Takeuchi, Kenji, Teshima, Katsuya, Rodríguez-Reinoso, Francisco, Endo, Morinobu, Kaneko, Katsumi
Format: Article
Language:English
Subjects:
Activation
Carbon
Carbon dioxide
Chemistry
Colloidal state and disperse state
Colloids
Cross-disciplinary physics: materials science
rheology
Exact sciences and technology
Fullerenes and related materials
diamonds, graphite
General and physical chemistry
Graphene
Materials science
Oxides
Physics
Porosity
Porous materials
Porous materials
granular materials
Specific materials
Surface area
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Summary:Graphene monoliths made from graphene oxide colloids by unidirectional freeze-drying method were activated by typical activation processes of CO2 activation, chemical activation using ZnCl2 or H3PO4, and KOH activation. The porosity development of graphene monolith markedly depends on the activation method. The monoliths with highest surface area are obtained by the KOH activation method; only the KOH activation is effective for production of the graphene monolith of which surface area is in the range of 1760–2150m2g−1. The mechanism of the porosity development by KOH activation method is proposed. This work provides a promising route for the bottom-up design of pore width-tunable nanoporous carbons.
ISSN:0008-6223
1873-3891
DOI:10.1016/j.carbon.2014.04.071