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Dependence of Supercapacitor Performance on the Structure of CNT Electrodes

  • 유용주 (Yong Ju Yoo, 대학원 신소재공학과 신소재공학전공)

초록/요약

We coated carbon nanotube ink without surfactants on the carbon paper using vacuum filtration. We produced thin supercapacitors that had high density. We realized that the thickness of horizontal CNTs was 91 times smaller than vertically aligned CNTs that were synthesized directly on the carbon paper by chemical vapor deposition. And their Csp was 73 times bigger than vertical ones. Also we confirmed that power max density and specific capacitance were increased, when mass of electrodes was decreased from 0.4 mg to 0.1 mg. And we found characters of energy storage and power capability were changed according the kind of electrolytes. We assumed that thin CNTs electrode with high density would serve in developing of small devices with limited space.

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목차

1. Introduction
2. Experimental Section
2.1 Synthesis of DWCNTs
2.2 Fabrication of CNT ink
2.3 Fabrication of CNT/Carbon Papers electrode
2.4 Characterization of CNT/Carbon Papers electrode
3. Result and Discussion
3.1 Analysis according to structure of CNTs
3.1.1 Thickness and raman spectra of CNTs
3.1.2 Electrochemical properties
3.1.2.1 CV and galvanostatic charge-discharge
3.1.2.2 Electrochemical impedance spectroscopy
3.1.2.3 Ragone plots and cyclability test
3.2 Analysis according to mass of CNTs
3.2.1 Thickness measurement according to mass of CNTs
3.2.2 Electrochemical properties
3.2.2.1 CV and galvanostatic charge-discharge
3.2.2.2 Electrochemical impedance spectroscopy
3.2.2.3 Ragone plots and cyclability test
3.3 Electrochemical properties according to different electrolytes
3.3.1 Electrochemical properties
3.3.1.1 CV and galvanostatic charge-discharge
3.3.3.2 Electrochemical impedance spectroscopy
3.3.3.3 Ragone plots and cyclability test
4. Conclusion
References

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