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Frontiers of Materials Science

ISSN 2095-025X

ISSN 2095-0268(Online)

CN 11-5985/TB

Postal Subscription Code 80-974

2018 Impact Factor: 1.701

Front. Mater. Sci.    2014, Vol. 8 Issue (4) : 391-398    https://doi.org/10.1007/s11706-014-0271-7
RESEARCH ARTICLE
Improvement in electrochemical capacitance of activated carbon from scrap tires by nitric acid treatment
Yan HAN1,2,3,Ping-Ping ZHAO1,2,3,Xiao-Ting DONG1,2,3,Cui ZHANG1,2,3,*(),Shuang-Xi LIU1,2,3,*()
1. Institute of New Catalytic Materials Science, College of Chemistry, Nankai University, Tianjin 300071, China
2. Key Laboratory of Advanced Energy Materials Chemistry (MOE), Tianjin 300071, China
3. Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), Tianjin 300071, China
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Abstract

Activated carbon (AC) obtained from the industrial pyrolytic tire char is treated by concentrated nitric acid (AC-HNO3) and then used as the electrode material for supercapacitors. Surface properties and electrochemical capacitances of AC and AC-HNO3 are studied. It is found that the morphology and the porous texture for AC and AC-HNO3 have little difference, while the oxygen content increases and functional groups change after the acid treatment. Electrochemical results demonstrate that the AC-HNO3 electrode displays higher specific capacitance, better stability and cycling performance, and lower equivalent series resistance, indicating that AC obtained from the industrial pyrolytic tire char treated by concentrated nitric acid is applicable for supercapacitors.

Keywords pyrolytic tire char      activated carbon (AC)      nitric acid treatment      electrochemical capacitance      supercapacitor     
Corresponding Author(s): Cui ZHANG   
Issue Date: 04 December 2014
 Cite this article:   
Yan HAN,Ping-Ping ZHAO,Xiao-Ting DONG, et al. Improvement in electrochemical capacitance of activated carbon from scrap tires by nitric acid treatment[J]. Front. Mater. Sci., 2014, 8(4): 391-398.
 URL:  
https://academic.hep.com.cn/foms/EN/10.1007/s11706-014-0271-7
https://academic.hep.com.cn/foms/EN/Y2014/V8/I4/391
Fig.1  TEM images of (a) AC and (b) AC-HNO3; (c) XRD patterns of AC and AC-HNO3.
Fig.2  (a) N2 adsorption/desorption isotherms; Pore size distributions of (b) micropores and (c) mesopores obtained by HK and BJH methods, respectively.
Sample SBETa)/(m2·g-1) Vtb)/(cm3·g-1) Vmic)/(cm3·g-1) Vmead)/(cm3·g-1) Vmi/Vt DHKe)/nm DBJHf)/nm
AC 911 0.97 0.29 0.68 0.30 0.58 7.08
AC-HNO3 915 0.95 0.29 0.66 0.31 0.57 6.58
Tab.1  Pore texture properties of AC and AC-HNO3
Fig.3  XPS results of AC in (a) C1s region and (b) O1s region; XPS results of AC-HNO3 in (c) C1s region and (d) O1s region.
Peak Group Binding energy/eV Mole percent/%
AC AC-HNO3 AC AC-HNO3
C1s C–C 284.5 284.5 56.7 44.8
C–O 285.2 285.2 23.3 30.6
C=O 286.5 286.3 11.1 15.5
O–C=O 289.0 288.9 8.9 9.1
O1s C=O carbonyl/quinone 530.9 531.9 14.0 13.2
CO–O–R ether 532.3 532.5 48.7 46.4
COOH carboxyl, water 533.7 533.8 37.3 40.4
Tab.2  XPS data of AC and AC-HNO3
Fig.4  CV curves of (a) AC and (b) AC-HNO3 electrodes at different voltage sweep rates from 1 to 100 mV/s.
Fig.5  (a) Galvanostatic charge/discharge curves of AC and AC-HNO3 electrodes at 1 A/g; (b) Variations of specific capacitance with cycle number at 1 A/g.
Fig.6  The Nyquist plots of AC and AC-HNO3 electrodes. The inset shows the high-frequency region of impedance.
Fig.7  (a) Real and (b) imaginary part of capacitance changes versus frequency.
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