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Title: Attachable micropseudocapacitors using highly swollen laser-induced-graphene electrodes
Authors: Lee, Yeong A.
Lim, Joel
Cho, Younghyun
Lee, Hyub
Park, Sangbaek
Lee, Go-Woon
Yoo, Chung-Yul
Park, Sang Hyun
Murukeshan, Vadakke Matham
Kim, Seungchul
Kim, Young-Jin
Yoon, Hana
Keywords: Engineering
Issue Date: 2020
Source: Lee, Y. A., Lim, J., Cho, Y., Lee, H., Park, S., Lee, G.-W., ... Yoon, H. (2020). Attachable micropseudocapacitors using highly swollen laser-induced-graphene electrodes. Chemical Engineering Journal, 386, 123972-. doi:10.1016/j.cej.2019.123972
Journal: Chemical Engineering Journal 
Abstract: For powering wearable electronics, extensive research has been directed toward microscale flexible and stretchable energy-storage devices. Microsupercapacitors, though promising candidates, remain limited in terms of design flexibility, scalability, reusability, and compatibility with general substrates. This paper reports a high-performance sticker-type flexible microsupercapacitor using highly swollen reduced-graphene-oxide electrodes fabricated by an ultrashort-pulse laser to promote full active-site and durability of the electrodes. Our sticker-type flexible micropseudocapacitor provides a comparable volumetric energy density of 1.08 mWh cm−3 and 13 times higher volumetric power density of 83.5 mW cm−3 compared to conventional lithium thin-film batteries. Bio-inspired surface modifications are additionally applied to the reduced-graphene-oxide electrodes, which provides a six-fold increase (10.38 mF cm−2) of the areal capacitance. A 6 × 2 micropseudocapacitor array embedded in a sub-millimeter thin PDMS film adheres to safety goggles and successfully powers a μ-LED. The total capacitance of the array is maintained at ~97% of its original value after 200 repetitive attachments and detachments showing good durability. In addition, the sticker-type micropseudocapacitor array shows a stable performance under repeated deformation, and up to ~99% of capacitance retention after 200 bending cycles. This novel re-attachable flexible micropseudocapacitor will expedite the widespread use of flexible and wearable devices.
ISSN: 1385-8947
DOI: 10.1016/j.cej.2019.123972
Rights: © 2020 Elsevier B.V. All rights reserved. This paper was published in Chemical Engineering Journal and is made available with permission of Elsevier B.V.
Fulltext Permission: embargo_20220415
Fulltext Availability: With Fulltext
Appears in Collections:SC3DP Journal Articles

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