Preparation and Properties of N-Doped Carbon Microtubes as the Electrode Material in Electrochemical Capacitor

doi:10.7503/cjcu20170474

Abstract

Abstract:

A series of N-doped carbon microtubes was prepared by using Reed catkins as the precursor and with both direct carbonization and chemical activation methods at different temperatures. The chemical activation method is more efficient, simpler and cost less compared to the traditional preparation method of N-doped carbon microtubes. The chemical activation material JJCZH-750(JJ stands for Reed catkins, Z stands for Zinc chloride, C stands for carbonization and 750 the optimized temperature) was optimized. The carbon microtubes were characterized by X-ray diffraction, infrared spectroscopy, Raman spectroscopy, scanning electron microscopy, transmission electron microscopy, thermogravimetric analysis(TGA), X-ray photoelectron spectroscopy, N₂ adsorption-desorption analysis, and electrochemical measurements. The results show that carbon accounts for 94.36%(mass fraction) and nitrogen accounts for 1.24%(mass fraction) of the sample, which shows a tendency to exist as graphite. TGA analysis of the samples indicates a high thermal stability with a mass loss lower than 5% below 400 ℃. N₂ sorption isotherms show that the samples is predominantly microporous(peak 1.2 nm) and occasionally mesoporous. Electrochemical measurements suggest that Reed catkins-based JJCZH-750 carbon microtubes have a specific capacitance up to 170 F/g, which remains at 153 F/g after 5000 cycles in a voltammetry test, showing a potential as electrode material in electrochemical capacitors.

Key words: Carbonized biomass, N-Doped carbon microtube, Reed catkin, Electrochemical capacitor

CLC Number:

O646
O613.71

TrendMD:

YANG Dongsheng,WANG Lei,CHEN Ling,ZHOU Jinya,FENG Wei,ZHANG Jianhui. Preparation and Properties of N-Doped Carbon Microtubes as the Electrode Material in Electrochemical Capacitor[J]. Chem. J. Chinese Universities, 2018, 39(5): 1055.

Figures/Tables 9

Fig.1 Preparation of Reed catkins-based carbon materials

Fig.2 N2 adsorption-desorption isotherms of different carbonized samples Note:a. JJCZH-550; b. JJCH-750; c. JJCZH-750; d. JJCH-950; e. JJCZH-950.

Fig.3 SEM images of JJ(A—C) and JJCZH-750(D—F) with different magnifications

Fig.4 XPS of JJCZH-750

Fig.5 TEM images of JJCZH-750

Fig.6 XRD pattern(A), IR spectrum(B), Raman spectrum(C) and TGA(D) curve of JJCZH-750

Fig.7 N2 adsorption-desorption isotherm(A) and pore size distribution curve(B) of JJCZH-750

Fig.8 Electrochemical measurement of JJCZH-750(A, B) and JJCH-750(C, D) Note:(A), (C) Cyclic voltammetry curves; (B), (D) galvanostatic charge-discharge curves.

Fig.9 Long term cycle stability of the JJCZH-750 at a scan rate of 0.1 V/s

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