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Supercapacitor Based on Carbon Nanotubes and Carbon Nanofibers Electrodes

Author: ZhangChao
Tutor: ZhangXiaoBin
School: Zhejiang University
Course: Materials Physics and Chemistry
Keywords: Carbon nanotubes Carbon Nanofibers Electrode material Supercapacitor
CLC: TM53
Type: Master's thesis
Year: 2006
Downloads: 487
Quote: 1
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Abstract

This thesis is a comprehensive review of the research progress of supercapacitor electrode material and the carbon nanotubes as supercapacitor electrode materials Research, an overview of the carbon nanotubes and carbon nanofibers material preparation, structure, performance and application. Using transmission electron microscopy, scanning electron microscopy, and BET test means, respectively, studied the micro-structure and physical properties of the electrode material of carbon nanotubes and carbon nanofibers using the electrochemical performance of the the programmed battery tester and electrochemical workstation test electrode materials . Preparation of high purity multi-walled carbon nanotubes (MWNT) beam chemical vapor deposition TGA results show that the purity of the crude product in more than 97%. After 3h milling process, the carbon nanotube bundles are truncated and partial opening by 238 m ~ 2 / g, specific surface area increased to 340 m ~ 2 / g. Two carbon nanotube bundles before and after handling the ball milling made into electrochemical supercapacitor electrode and assembled into a simulation of electrochemical supercapacitors using cyclic voltammetry and constant current charge and discharge test carbon nanotube electrode electrochemical reversible capacity. The results showed that after milling, multi-walled carbon nanotube bundles prepared supercapacitor electrode electrochemical capacitance of 36 F / g to 72 F / g, show that the milled carbon nanotube bundle more suitable as electrochemical supercapacitor electrode material. Using KOH to different degrees (KOH / CNT mass ratios of 3:1 and 7:1) activation treatment of the bamboo-shaped carbon nanotube by transmission electron microscope and high resolution transmission electron microscope observation, the wall etched and open at both ends of the carbon nanotube, activated carbon tube remains in the pore properties, and at the same time, and also generates a large number of micropores. Three kinds of carbon nanotube than the surface area before and after activation with a specific surface area and pore distribution analyzer test and found that the activity of the effective specific surface area of ??the carbon nanotube having a carbon nanotube higher than before activation, respectively, these two carbon nanotube as an electrode The materials used in electrochemical supercapacitors, tested, and found that the activation of the bamboo-like carbon nanotubes greatly improve the electrochemical capacity, respectively, 1.5 and 3 times the original bamboo-shaped carbon nanotubes electrodes. Using a special alkali metal doped Cu catalyst grown porous the bifurcated nano carbon fibers, and as a super-capacitor electrode material, the electrochemical properties were tested. Due to the special structure of the nano-carbon fiber, is larger than the surface area of ??the electrode material has great potential. The appropriate adjustments to the catalyst composition ratio and growth conditions, can grow out of the special structure of the copper cone carbon nanotubes, the paper discussed the mechanism of formation of porous nano-carbon fiber and copper cone carbon nanotubes and their potential applications.

Supercapacitor Based on Carbon Nanotubes and Carbon Nanofibers Electrodes

Abstract

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