Sea-Urchin-Inspired 3D Crumpled Graphene Balls Using Simultaneous Etching and Reduction Process for High-Density Capacitive Energy Storage

Jang Yeol Lee, Kwang Hoon Lee, Young Jin Kim, Jeong Sook Ha, Sang-Soo Lee, Jeong Gon Son

Research output: Contribution to journalArticle

38 Citations (Scopus)

Abstract

A crumpled configuration of graphene is desirable for preventing irreversible stacking between individual nanosheets, which can be a major hurdle toward its widespread application. Herein a sea-urchin-shaped template approach is introduced for fabricating highly crumpled graphene balls in bulk quantities with a simple process. Simultaneous chemical etching and reduction process of graphene oxide (GO)-encapsulated iron oxide particles results in dissolution of the core template with spiky morphology and conversion of the outer GO layers into reduced GO layers with increased hydrophobicity which remain in contact with the spiky surface of the template. After completely etching, the outer graphene layers are fully compressed into the crumpled form along with decrease in total volume by etching. The crumpled balls exhibit significantly larger surface area and good water-dispersion stability than those of stacked reduced GO or other crumple approaches, even though they also show comparable electrical conductivity. Furthermore, they are easily assembled into 3D macroporous networks without any binders through typical processes such as solvent casting or compression molding. The graphene networks with less pore volume still have the crumpled morphology without sacrificing the properties regardless of the assembly processes, producing a promising active electrode material with high gravimetric and volumetric energy density for capacitive energy storage.

Original languageEnglish
Pages (from-to)3606-3614
Number of pages9
JournalAdvanced Functional Materials
Volume25
Issue number23
DOIs
Publication statusPublished - 2015 Jun 1

    Fingerprint

Keywords

  • 3D porous materials
  • crumpled nanostructures
  • graphene oxides
  • high volumetric supercapacitors
  • template-guided methods

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Biomaterials
  • Condensed Matter Physics
  • Electrochemistry

Cite this