Nitrogen and boron co-doped densified laser-induced graphene for supercapacitor applications
- Authors
- Khandelwal, M.; Tran, C.V.; Lee, J.; In, J.B.
- Issue Date
- 15-Jan-2022
- Publisher
- Elsevier B.V.
- Keywords
- Densification; Flexible supercapacitor; Laser-induced graphene; N and B co-doping; Pseudo-capacitance
- Citation
- Chemical Engineering Journal, v.428
- Journal Title
- Chemical Engineering Journal
- Volume
- 428
- URI
- https://scholarworks.bwise.kr/cau/handle/2019.sw.cau/49673
- DOI
- 10.1016/j.cej.2021.131119
- ISSN
- 1385-8947
1873-3212
- Abstract
- This study demonstrates a facile and versatile approach to the fabrication of N and B co-doped and simultaneously densified laser-induced graphene (NB-dLIG) based on a duplicate laser pyrolysis method for supercapacitor applications. The LIG obtained after the first laser pyrolysis is coated with an additional thin layer of polyamic acid /H3BO3 and additionally irradiated with a laser, resulting in the simultaneous densification and incorporation of N and B heteroatoms into the graphene-like structure of LIG. The NB-dLIG with optimized H3BO3 loading (1 wt%) and duplicate laser power (2.4 W; NB1-dLIG-2.4) exhibits remarkably improved capacitive performance due to the synergistic effect of N and B co-doping. The NB1-dLIG-2.4 electrode delivers a specific areal capacitance (CA) of 104.3 mF/cm2, which is nearly 2.5 and 12 times higher than N-doped dLIG (42.4 mF/cm2) and undoped single pyrolyzed LIG (9.0 mF/cm2), respectively, at 0.2 mA/cm2 using a three-electrode assembly. Furthermore, a solid-state flexible supercapacitor is fabricated with NB1-dLIG-2.4 and PVA-H2SO4 gel electrolyte, attaining a high CA (40.4 mF/cm2 at 0.05 mA/cm2), with excellent cycling stability, Coulombic efficiency, and mechanical flexibility. This work opens a new avenue for fabricating LIG doped with multiple heteroatoms, which can be used in various electrochemical applications. © 2021 Elsevier B.V.
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