High-performance all-solid-state flexible micro-supercapacitor arrays with layer-by-layer assembled MWNT/MnOx nanocomposite electrodes
- Authors
- Lee, Geumbee; Kim, Daeil; Yun, Junyeong; Ko, Yongmin; Cho, Jinhan; Ha, Jeong Sook
- Issue Date
- 21-8월-2014
- Publisher
- ROYAL SOC CHEMISTRY
- Citation
- NANOSCALE, v.6, no.16, pp.9655 - 9664
- Indexed
- SCIE
SCOPUS
- Journal Title
- NANOSCALE
- Volume
- 6
- Number
- 16
- Start Page
- 9655
- End Page
- 9664
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/97668
- DOI
- 10.1039/c4nr02035a
- ISSN
- 2040-3364
- 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 similar to 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 similar to 10(4) times, the capacitance remained at similar to 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.
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Collections - College of Engineering > Department of Chemical and Biological Engineering > 1. Journal Articles
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