An ice-templated, pH-tunable self-assembly route to hierarchically porous graphene nanoscroll networks

Porous graphene nanostructures are of great interest for applications in catalysis and energy storage. However, the fabrication of three-dimensional (3D) macroporous graphene nanostructures with controlled morphology, porosity and surface area still presents significant challenges. Here we introduce...

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Bibliographic Details
Published in:Nanoscale 2014-08, Vol.6 (16), p.9734-9741
Main Authors: Shin, Young-Eun, Sa, Young Jin, Park, Seungyoung, Lee, Jiwon, Shin, Kyung-Hee, Joo, Sang Hoon, Ko, Hyunhyub
Format: Article
Language:English
Subjects:
Graphene
Morphology
Nanostructure
Networks
Oxides
Self assembly
Three dimensional
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Summary:Porous graphene nanostructures are of great interest for applications in catalysis and energy storage. However, the fabrication of three-dimensional (3D) macroporous graphene nanostructures with controlled morphology, porosity and surface area still presents significant challenges. Here we introduce an ice-templated self-assembly approach for the integration of two-dimensional graphene nanosheets into hierarchically porous graphene nanoscroll networks, where the morphology of porous structures can be easily controlled by varying the pH conditions during the ice-templated self-assembly process. We show that freeze-casting of reduced graphene oxide (rGO) solution results in the formation of 3D porous graphene microfoam below pH 8 and hierarchically porous graphene nanoscroll networks at pH 10. In addition, we demonstrate that graphene nanoscroll networks show promising electrocatalytic activity for the oxygen reduction reaction (ORR).
ISSN:2040-3364
2040-3372
DOI:10.1039/c4nr01988a