Fabrication of flexible micro-supercapacitor array with patterned graphene foam/MWNT-COOH/MnOx electrodes and its application

Young Sun Moon, Daeil Kim, Geumbee Lee, Soo Yeong Hong, Kuk Ki Kim, Seung Min Park, Jeong Sook Ha

Research output: Contribution to journalArticle

41 Citations (Scopus)

Abstract

We report on the facile fabrication of an all-solid-state flexible planar-type micro-supercapacitor (MSC) array with micropatterned hybrid electrodes of graphene foam (GF)/COOHfunctionalized multi-walled nanotubes (MWNT-COOH)/MnOx and its application as a power source to operate various micro-light emitting diodes (l-LEDs) and a SnO2 nanowire (NW) UV sensor. Composite electrodes of GF/MWNT-COOH/MnOx were simply micropatterned via reactive ion etching (RIE) with a metal mask, and used as current collectors as well as active materials. Polyvinyl alcohol-H3PO4 was used as the solid-state electrolyte. The use of the composite film electrodes increased the area specific capacitance ∼11 times compared to the MSC with just patterned GF electrodes. After 104 charge/discharge cycles, 89.5% of the initial capacitance was maintained. Furthermore, very stable performance was observed over 103 bending of the whole MSC on a polyethersulfone substrate with capacitance retention of 95.5%. For the first time, we could directly measure the UV-induced photocurrent through a SnO2 NW sensor powered by 4 MSCs connected in parallel. Fast response to UV pulses was detected for a time of more than 10 min. This work demonstrates the high application potential of our MSCs using patterned electrodes of GF/MWNT-COOH/ MnOx to self-powered flexible electronic devices including NW-based sensors.

Original languageEnglish
Pages (from-to)29-37
Number of pages9
JournalCarbon
Volume81
Issue number1
DOIs
Publication statusPublished - 2015

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Graphite
Foams
Fabrication
Electrodes
Nanowires
Capacitance
Light emitting diodes
Sensors
Flexible electronics
Polyvinyl Alcohol
Reactive ion etching
Composite films
Photocurrents
Nanotubes
Electrolytes
Masks
Metals
Supercapacitor
Composite materials
Substrates

ASJC Scopus subject areas

  • Chemistry(all)

Cite this

Fabrication of flexible micro-supercapacitor array with patterned graphene foam/MWNT-COOH/MnOx electrodes and its application. / Moon, Young Sun; Kim, Daeil; Lee, Geumbee; Hong, Soo Yeong; Kim, Kuk Ki; Park, Seung Min; Ha, Jeong Sook.

In: Carbon, Vol. 81, No. 1, 2015, p. 29-37.

Research output: Contribution to journalArticle

Moon, Young Sun ; Kim, Daeil ; Lee, Geumbee ; Hong, Soo Yeong ; Kim, Kuk Ki ; Park, Seung Min ; Ha, Jeong Sook. / Fabrication of flexible micro-supercapacitor array with patterned graphene foam/MWNT-COOH/MnOx electrodes and its application. In: Carbon. 2015 ; Vol. 81, No. 1. pp. 29-37.
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