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

Authors
Moon, Young SunKim, DaeilLee, GeumbeeHong, Soo YeongKim, Kuk KiPark, Seung MinHa, Jeong Sook
Issue Date
1월-2015
Publisher
PERGAMON-ELSEVIER SCIENCE LTD
Citation
CARBON, v.81, pp.29 - 37
Indexed
SCIE
SCOPUS
Journal Title
CARBON
Volume
81
Start Page
29
End Page
37
URI
https://scholar.korea.ac.kr/handle/2021.sw.korea/94706
DOI
10.1016/j.carbon.2014.09.018
ISSN
0008-6223
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)/COOH-functionalized multi-walled nanotubes (MWNT-COOH)/MnOx and its application as a power source to operate various micro-light emitting diodes (mu-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 similar to 11 times compared to the MSC with just patterned GF electrodes. After 10(4) charge/discharge cycles, 89.5% of the initial capacitance was maintained. Furthermore, very stable performance was observed over 10(3) 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. (C) 2014 Elsevier Ltd. All rights reserved.
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공과대학 (화공생명공학과)
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