研究目的
To develop a duplicated laser pyrolysis method for densifying laser-induced graphene (LIG) and nitrogen doping to improve electrochemical performance for supercapacitor applications.
研究成果
The duplicated laser pyrolysis method successfully densified LIG and incorporated nitrogen doping, significantly improving electrochemical performance. The d-LIG electrodes exhibited a 6-fold increase in specific capacitance compared to singly pyrolyzed LIG electrodes. The fabricated solid-state flexible supercapacitor demonstrated high capacitance, stability, and flexibility, indicating the potential of d-LIG for advanced energy storage applications.
研究不足
The study is limited by the intrinsic low surface area of LIG, which affects capacitance and energy density. Although densification increases surface area in a given volume, the enhancement is constrained by the original surface area.
1：Experimental Design and Method Selection:
The study involves duplicated laser pyrolysis of polyimide to produce densified LIG (d-LIG) with nitrogen doping. The first laser pyrolysis generates LIG, which is then coated with an additional polyimide layer and subjected to a second laser pyrolysis.
2：Sample Selection and Data Sources:
Commercial polyimide sheets were used as precursors for LIG. The effects of laser power on d-LIG morphology and electrochemical characteristics were investigated.
3：List of Experimental Equipment and Materials:
A CO2 laser engraver, optical chopper system, spin coater, vacuum oven, hot plate, FE-TEM, FE-SEM, FTIR, BET surface area analyzer, XPS, Raman spectrometer, potentiostat.
4：Experimental Procedures and Operational Workflow:
The process includes laser pyrolysis of polyimide, coating with polyamic acid (PAA), annealing for imidization, and a second laser pyrolysis. Electrochemical performance was evaluated using a three-electrode configuration.
5：Data Analysis Methods:
Electrochemical performance was assessed through cyclic voltammetry (CV), galvanostatic charge-discharge (CC), and electrochemical impedance spectroscopy (EIS). Material characterization was performed using FE-TEM, FE-SEM, FTIR, BET, XPS, and Raman spectroscopy.
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FTIR
Nicolet 6700
Thermo Fisher Scientific
Used to confirm PAA imidization to PI.
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XPS
K-alpha Plus
Thermo Fisher Scientific
Used to investigate the chemical structure and composition of LIG.
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Optical chopper system
MC2000B-EC
Thorlabs
Used to modulate the intensity of the laser beam for the first laser pyrolysis.
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FE-TEM
Tecnai G2 F30 S-TWIN
FEI
Used to observe the morphology of LIG.
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FE-SEM
SIGMA
Carl Zeiss
Used to observe the microstructure of LIG.
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CO2 laser engraver
C40–60 W
Coryart
Used for laser pyrolysis of polyimide under ambient conditions.
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Spin coater
SPIN-1200D
MIDAS
Used to form a thin PAA film on the LIG by removing excessive PAA.
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Vacuum oven
HQ-VDO27
CORETECH
Used to anneal the sample to remove residual solvent.
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Hot plate
HS180
MTOPS
Used for further annealing to ensure complete imidization.
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BET surface area analyzer
ASAP 2020
Micromeritics
Used to measure electrode SSA.
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Raman spectrometer
FEX
NOST
Used to perform Raman spectroscopy.
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Potentiostat
SP-150
Bio-Logic Science Instruments
Used to obtain CV, CC, and EIS characteristics.
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