An ice-templated, pH-tunable self-assembly route to hierarchically porous graphene nanoscroll networks
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- An ice-templated, pH-tunable self-assembly route to hierarchically porous graphene nanoscroll networks
- Shin, Young-Eun; Sa, Young Jin; Park, Seungyoung; Lee, Jiwon; Shin, Kyung-Hee; Joo, Sang Hoon; Ko, Hyunhyub
- Electrolytic reduction; Ice; Morphology; Nanostructures; Porosity; Self assembly Controlled morphology; Electrocatalytic activity; Graphene nanosheets; Hierarchically porous; Oxygen reduction reaction; Porous structures; Reduced graphene oxides (RGO); Self assembly process
- Issue Date
- ROYAL SOC CHEMISTRY
- NANOSCALE, v.6, no.16, pp.9734 - 9741
- 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).
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