Self-activated Carex Meyeriana Kunth-based Porous Carbon Prepared by Direct Carbonization and Its Electrochemical Properties†

doi:10.7503/cjcu20160075

Abstract

Abstract:

Porous carbon material UlaC-950-HF(Ula stands for Carex meyeriana Kunth, C is short for carbo-nized, 950 is the optimized temperature, and HF is the etchant) was prepared through direct carbonization of Carex meyeriana Kunth after necessary impurity removal. The precursor self-activated in the process of pyrolysis. The electrochemical measurements of the UlaC-950-HF sample and several other carbonized biomass-based porous carbon materials were carried out. The results revealed that the capacitance of UlaC-950-HF was 113 F/g. In addition, the electrode showed excellent cycling stability as its specific capacitance decreased only by 4 F/g after 4000 voltammetry cycles, showing its potential of being applied in the supercapacitor electrode material.

Key words: Carbonized biomass, Carex meyeriana Kunth, Self-activation, Electrochemistry

CLC Number:

O613.71
O646

TrendMD:

WANG Yun, BEN Teng, QIU Shilun. Self-activated Carex Meyeriana Kunth-based Porous Carbon Prepared by Direct Carbonization and Its Electrochemical Properties^†[J]. Chem. J. Chinese Universities, 2016, 37(6): 1042.

Figures/Tables 9

Fig.1 N2 sorption isotherms of samples carbonized at various temperaturesTemperature/℃: a. 600; b. 800; c. 950; d. 1000.

Table 1 Pore parameters of different samples

Sample	S_BET/(m²·g^-1)	Total pore vol./ (cm³·g^-1)	Pore size/nm	Sample	S_BET/(m²·g^-1)	Total pore vol./ (cm³·g^-1)	Pore size/nm
UlaC-600	14	0.006	0.6	UlaC-1000	857	0.39	1.2
UlaC-800	517	0.33	0.8	UlaC-950-HF	1476	0.61	1.1
UlaC-950	942	0.58	1.0

Fig.2 SEM(A, B) and TEM(C) images and EDS spectra(D, E) of Ula(A, D) and UlaC-950-HF(B, C, E)

Fig.3 IR spectra of Ula(a) and UlaC-950-HF(b)

Fig.4 XRD pattern of UlaC-950-HF

Fig.5 Raman spectrum of UlaC-950-HF

Fig.6 N2 sorption isotherms of different carbonized biomassesa. UlaC-950-HF; b. commercial activated carbon; c. directly carbonized rice husk; d. activated rice husk by K2CO3; e. directly carbonized ethanol ligin.

Fig.7 Electrochemical measurement of carbonized biomasses(A1—E1) Cyclic voltammetry curves, scan rate/(V·s-1): a. 0.001, b. 0.005, c. 0.01, d. 0.02, e. 0.05, f. 0.1; (A2—E2) galvano-static charge-discharge curves, current density/(A·g-1): a. 1, b. 2, c. 5, d. 10, e. 20. (A3—E3) Nyquist plots; (A1—A3) UlaC-950-HF; (B1—B3) commercial activated carbon; (C1—C3) direct carbonized rice husk; (D1—D3) carbonized rice husk by K2CO3; (E1—E3) directly carbonized ethanol ligin.

Fig.8 Long-term cycle stability of the UlaC-950-HF at scan rate of 0.05 V/s

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