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A Fractal-designed stretchable and transparent microsupercapacitor as a Skin-attachable energy storage device

Authors
Yun, JunyeongLee, HanchanSong, ChanghoonJeong, Yu RaPark, Jin WooLee, Jin HoKim, Dong SikKeum, KayeonKim, Min SuJin, Sang WooLee, Yong HuiKim, Jung WookZi, GoangseupHa, Jeong Sook
Issue Date
1-5월-2020
Publisher
ELSEVIER SCIENCE SA
Keywords
Transparent; Stretchable; Microsupercapacitor; Fractal design; Skin-attachable
Citation
CHEMICAL ENGINEERING JOURNAL, v.387
Indexed
SCIE
SCOPUS
Journal Title
CHEMICAL ENGINEERING JOURNAL
Volume
387
URI
https://scholar.korea.ac.kr/handle/2021.sw.korea/56047
DOI
10.1016/j.cej.2020.124076
ISSN
1385-8947
Abstract
We report on the fabrication of a fractal-designed transparent and stretchable (TS) microsupercapacitor (MSC) as a skin-attachable energy storage device for driving an integrated strain sensor (SS). The MSC is designed to have a fractal structure with long and narrow patterns to ensure high transparency and stretchability. MnO2/Carbon nanotubes (CNTs) and 1-butyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide/poly(methyl methacrylate) ([BMIM][TFSI]/PMMA) are used as electrodes and a stretchable electrolyte for the MSC, respectively. The fabricated MSC exhibits high transparency of 79% and an areal capacitance of 12.6 mF cm(-2) at a current density of 5 mA cm(-2). The TS MSC shows excellent mechanical stability in that it can maintain stable electrochemical performance even after 2000 repeated stretching cycles up to 30%. The TS SS is facilely prepared via spray coating of Ag nanowires (NWs) and subsequent curing of PDMS, where the transparency and the electrical resistance are controlled by adjusting the deposited volume of Ag NWs. Wrist bending and a wrist pulse are detected by the SS driven with the stored energy of the MSC. This work demonstrates the possible application of our TS MSC to future skin-attachable electronics as an integrated energy storage device.
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Ha, Jeong Sook
공과대학 (화공생명공학과)
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