All-solid-state flexible micro-supercapacitor arrays with patterned graphene/MWNT electrodes

Junyeong Yun, Daeil Kim, Geumbee Lee, Jeong Sook Ha

Research output: Contribution to journalArticlepeer-review

151 Citations (Scopus)

Abstract

We report on the fabrication of all-solid-state flexible micro-supercapacitor (MSC) arrays with electrodes consisting of patterned multilayer graphene (MG) and functionalized multi-walled carbon nanotubes (MWNTs), and polyvinyl alcohol (PVA)-H3PO4 gel electrolyte. The fabricated MSC exhibited areal capacitance of 2.54 mF/cm2 at a scan rate of 10 mV/s, which is ∼150 times higher than that of MSC with MG electrode. The areal energy and power density were also dramatically improved via using MG/MWNT electrodes. In addition, there was no deterioration of the electrical performance over repetitive convex and concave bending with a bending radius of 2.3 mm. Furthermore, both the output voltage and the total capacitance of the MSC could be controlled via the serial or parallel connection of multiple planar-type MSCs to operate high-voltage light-emitting diodes.

Original languageEnglish
Pages (from-to)156-164
Number of pages9
JournalCarbon
Volume79
Issue number1
DOIs
Publication statusPublished - 2014

Bibliographical note

Funding Information:
This work was financially supported by the National Research Foundation of Korea (NRF) grant funded by the Korea Government (MEST) (Grant No. NRF-2013R1A2A1A01016165 ). We also thank the KU-KIST graduate school program of Korea University.

Publisher Copyright:
© 2014 Elsevier Ltd. All rights reserved.

Copyright:
Copyright 2017 Elsevier B.V., All rights reserved.

ASJC Scopus subject areas

  • General Chemistry
  • General Materials Science

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