Layer-by-layer assembled (high-energy carbon nanotube/conductive carbon nanotube)n nanocomposites for high volumetric capacitance supercapacitor electrodes

Dongyeeb Shin, Yongmin Ko, Jinhan Cho

Research output: Contribution to journalArticle

10 Citations (Scopus)

Abstract

We introduce high-performance ultrathin electrochemical electrodes based on multi-stacking of high-energy multiwall carbon nanotube (MWCNT) hybrids and conductive MWCNTs. The MWCNT hybrids coated with oleic acid-stabilized pseudocapacitive nanoparticles (i.e., OA-PC-MWCNTs) were assembled via a sequential covalent-bonded layer-by-layer (LbL) approach with amine-functionalized MWCNTs (NH2-MWCNT) in organic media, generating a highly porous structure and allowing for precise nanoscale control of the electrode thickness. The resultant NH2-MWCNT/OA-PC-MWCNT multilayer electrodes exhibited a high energy capacity and remarkable operational stability, considerably higher than the capacity and stability of conventional blended nanocomposite or electrostatic LbL-assembled electrodes. The volumetric capacitances of the (NH2-MWCNT/OA-Fe3O4-MWCNT)20 and (NH2-MWCNT/OA-MnO-MWCNT)20 were approximately 394 ± 10, and 674 ± 13 F cm-3 at 1 A cm-3, respectively. Additionally, these electrodes maintained their high volumetric capacitances without loss of initial capacitance even after 10000 cycles; this cycling stability stemmed from the formation of chemically stable covalent bonds between the MWCNT hybrids and NH2-MWCNTs and between the PC NPs and NH2-MWCNTs. Given that a variety of PC NPs can be used to prepare MWCNT hybrids and that this approach can be further expanded to nanocomposite films including LbL-assembled multilayers, our approach may provide a promising platform for designing electrodes for use as thin film-type energy storage devices.

Original languageEnglish
Pages (from-to)21844-21853
Number of pages10
JournalRSC Advances
Volume6
Issue number26
DOIs
Publication statusPublished - 2016

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Chemistry(all)

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