Hierarchical networks of redox-active reduced crumpled graphene oxide and functionalized few-walled carbon nanotubes for rapid electrochemical energy storage

Byeongyong Lee, Chongmin Lee, Tianyuan Liu, Kwangsup Eom, Zhongming Chen, Suguru Noda, Thomas F. Fuller, Hee Dong Jang, Seung Woo Lee

Research output: Contribution to journalArticlepeer-review

24 Citations (Scopus)

Abstract

Crumpled graphene is known to have a strong aggregation-resistive property due to its unique 3D morphology, providing a promising solution to prevent the restacking issue of graphene based electrode materials. Here, we demonstrate the utilization of redox-active oxygen functional groups on the partially reduced crumpled graphene oxide (r-CGO) for electrochemical energy storage applications. To effectively utilize the surface redox reactions of the functional groups, hierarchical networks of electrodes including r-CGO and functionalized few-walled carbon nanotubes (f-FWNTs) are assembled via a vacuum-filtration process, resulting in a 3D porous structure. These composite electrodes are employed as positive electrodes in Li-cells, delivering high gravimetric capacities of up to ∼170 mA h g-1 with significantly enhanced rate-capability compared to the electrodes consisting of conventional 2D reduced graphene oxide and f-FWNTs. These results highlight the importance of microstructure design coupled with oxygen chemistry control, to maximize the surface redox reactions on functionalized graphene based electrodes.

Original languageEnglish
Pages (from-to)12330-12338
Number of pages9
JournalNanoscale
Volume8
Issue number24
DOIs
Publication statusPublished - 2016 Jun 28

ASJC Scopus subject areas

  • Materials Science(all)

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