Fabrication and Capacitance Performance of Laser-machined RGO/MWCNT/CF In-plane Flexible Micro-supercapacitor †

doi:10.7503/cjcu20190480

Abstract

Abstract:

Micro and flexible supercapacitors are promising energy storage devices that were prerequisite in smart-garment system. However, the electrochemical performance of micro-supercapacitor is lower than that of batteries. Herein, RGO/MWCNT/CF micro-supercapacitor was prepared via laser-machining of graphene oxide(GO) and multi-walled carbon nanotubes(MWCNT) on the cotton fabric(CF). The GO was reduced and MWCNT was fixed on the graphene layer when the laser sculptured the in-plane pattern on the cotton fabric. This nanomaterial shows high electrical conductivity(7. 19×10 ⁴ S/m), attributed to the combined nanomaterials increasing the integrality of the conducting network. The best monolithic supercapacitor exhibited an area capacitance of 24 mF/cm ² in PVA-LiCl electrolyte(PVA=polyvinyl alcohol). The energy density attained 1.22 mW·h/kg and the power density reached 61 mW·h/kg. Micro-supercapacitors exhibited remarkably high mechanical fiexibility and showed a good cycling stability, with 92% retention of the specific capacity after 1000 cycles.

Key words: Reduced graphene oxide(RGO), Multi-walled carbon nanotubes(MWCNT), Cotton fabric(CF), Flexible supercapacitor, Laser-machining

CLC Number:

O646

TrendMD:

GUAN Fanglan,LI Xin,ZHANG Qun,GONG Yan,LIN Ziyu,CHEN Yao,WANG Lejun. Fabrication and Capacitance Performance of Laser-machined RGO/MWCNT/CF In-plane Flexible Micro-supercapacitor ^†[J]. Chem. J. Chinese Universities, 2020, 41(2): 300.

Figures/Tables 8

Fig.1 Fabrication of composite textile electrodes

Fig.2 SEM images of RGO/21%MWCNT/CF (A) Interface between RGO/MWCNT and cotton Fabric; (B) RGO/MWCNT layered structure reduced by 5 W laser; (C) cross-sectional image of the folded RGO/21%MWCNT/CF electrode; (D) network structure formed by RGO/21%MWCNT/CF electrode.

Fig.3 Raman spectra(A, B) and XRD patterns(C, D) of RGO/21%MWCNT/CF electrode with 4 W(A, C) and 5 W(B, D) laser reducing

Fig.4 Electrode conductivity of RGO/MWCNT/CF with 4 W(a) and 5 W(b) laser reducing

Fig.5 CV curves at scan rates from 10 mA/s to 100 mA/s of supercapacitors F(A) and A(B)

Fig.6 Cycling performance of supercapacitor A(A) and EIS spectra(B) of RGO/MWCNT/CF at a scan rate of 100 mA/cm2 a. Supercapacitor A; b. supercapacitor B; c. supercapacitor C; d. supercapacitor D; e. supercapacitor E; f. supercapacitor F. Inset of (A): GCD curves of supercapacitor A. Inset of (B): the equivalent circuit.

Fig.7 GCD curves(A) at a scan rates of 100 mA/cm2 and specific capacitance of supercapacitor G at different current density(B)

Electrode material	Current collector	Base	Test condition	Capacitance/(mF·cm^-2)	Ref.
RGO/MWCNT	Foamed Ni	Cotton	100 mV/s	24	This work
Nylon-graphene	Au-coated vinyl film	Nonwoven	10 mV/s	10.37	[31]
GO	None	PET film	16.8 mA/cm³	2.32	[32]
GO	Patterned polyvinyl tap	None	40 mV/s	0.51	[33]
MXene	Au	Paper	20 mV/s	25	[34]

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