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Issue 16, 2014
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An ice-templated, pH-tunable self-assembly route to hierarchically porous graphene nanoscroll networks

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Abstract

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).

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

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Publication details

The article was received on 13 Apr 2014, accepted on 09 Jun 2014 and first published on 10 Jun 2014


Article type: Paper
DOI: 10.1039/C4NR01988A
Citation: Nanoscale, 2014,6, 9734-9741
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    An ice-templated, pH-tunable self-assembly route to hierarchically porous graphene nanoscroll networks

    Y. Shin, Y. J. Sa, S. Park, J. Lee, K. Shin, S. H. Joo and H. Ko, Nanoscale, 2014, 6, 9734
    DOI: 10.1039/C4NR01988A

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