Attachable micropseudocapacitors using highly swollen laser-inducedgraphene electrodes

Title
Attachable micropseudocapacitors using highly swollen laser-inducedgraphene electrodes
Authors
박상백Yeong A. LeeJoel LimYounghyun Cho이협Go-Woon LeeChung-Yul YooSang Hyun ParkVadakke Matham MurukeshanSeungchul Kim김영진Hana Yoon
Issue Date
2020-04
Publisher
Chemical engineering journal
Citation
VOL 386, 123981
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.
URI
http://pubs.kist.re.kr/handle/201004/71253
ISSN
1385-8947
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