High-performance all-solid-state flexible micro-supercapacitor arrays with layer-by-layer assembled MWNT/MnOx nanocomposite electrodes

Geumbee Lee, Daeil Kim, Junyeong Yun, Yongmin Ko, Jinhan Cho, Jeong Sook Ha

Research output: Contribution to journalArticle

59 Citations (Scopus)

Abstract

In this study, we report on the fabrication of high performance planar-type flexible micro-supercapacitor (MSC) arrays using Au electrodes coated with a functionalized multi-walled carbon nanotube (MWNT) film and a layer of MWNT-COOH/MnOx nanoparticle (NP) composite on top. The MWNT thin film was formed via layer-by-layer (LbL) assembly of MWNTs functionalized with amine groups and MWNTs with carboxylic acid groups in water. The hydrothermally synthesized composite of MWNT-COOH/MnOx NPs was coated on top of the MWNT film (LbL-MWNT). The addition of MWNT-COOH/MnOx NP composite as a top layer enhanced the performance of the MSCs dramatically, resulting in a volumetric capacitance of 50 F cm-3 at a scan rate of 10 mV s -1 and a coulombic efficiency of ∼100%. By contrast, a volumetric capacitance of 3.6 F cm-3 was obtained when using only the LbL-MWNT film. After repetitive operation up to ∼104 times, the capacitance remained at ∼88.3% of the original value. With a deliberate circuit design consisting of serially connected MSC arrays, various light-emitting diodes operating at different bias voltages could be lit. The MSC circuit fabricated on a polyethylene terephthalate (PET) film showed stable electrochemical properties upon 1000 cycles of bending deformation.

Original languageEnglish
Pages (from-to)9655-9664
Number of pages10
JournalNanoscale
Volume6
Issue number16
DOIs
Publication statusPublished - 2014 Aug 21

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Carbon Nanotubes
Carbon nanotubes
Nanocomposites
Electrodes
Capacitance
Composite materials
Nanoparticles
Polyethylene Terephthalates
Supercapacitor
Networks (circuits)
Carboxylic Acids
Bias voltage
Electrochemical properties
Carboxylic acids
Polyethylene terephthalates
Amines
Light emitting diodes
Fabrication
Thin films
Water

ASJC Scopus subject areas

  • Materials Science(all)

Cite this

High-performance all-solid-state flexible micro-supercapacitor arrays with layer-by-layer assembled MWNT/MnOx nanocomposite electrodes. / Lee, Geumbee; Kim, Daeil; Yun, Junyeong; Ko, Yongmin; Cho, Jinhan; Ha, Jeong Sook.

In: Nanoscale, Vol. 6, No. 16, 21.08.2014, p. 9655-9664.

Research output: Contribution to journalArticle

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