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
- Issue Date
- 15-Apr-2020
- Publisher
- Elsevier BV
- Keywords
- Microsupercapacitor; Pseudocapacitor; Laser direct writing; Laser-induced graphene; Attachable energy storage device
- Citation
- Chemical Engineering Journal, v.386
- Journal Title
- Chemical Engineering Journal
- Volume
- 386
- URI
- https://scholarworks.bwise.kr/sch/handle/2021.sw.sch/2909
- DOI
- 10.1016/j.cej.2019.123972
- ISSN
- 1385-8947
1873-3212
- 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 x 2 micropseudocapacitor array embedded in a sub-millimeter thin PDMS film adheres to safety goggles and successfully powers a mu-LED. The total capacitance of the array is maintained at similar to 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 similar 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.
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