CN103745834A - Carbon nanometer tube/polypyrrole/graphite felt composite electrode and preparing method thereof - Google Patents

Carbon nanometer tube/polypyrrole/graphite felt composite electrode and preparing method thereof Download PDF

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CN103745834A
CN103745834A CN201410011800.3A CN201410011800A CN103745834A CN 103745834 A CN103745834 A CN 103745834A CN 201410011800 A CN201410011800 A CN 201410011800A CN 103745834 A CN103745834 A CN 103745834A
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electrode
graphite felt
tube
pyrroles
carbon nano
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CN103745834B (en
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李宝铭
饶臻然
叶蕾蕾
郑玉婴
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Fuzhou University
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Fuzhou University
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Abstract

The invention discloses a carbon nanometer tube/polypyrrole/graphite felt composite electrode as well as a preparing method and application thereof. Oxidation pretreatment graphite felt is used as a work electrode, a platinum wire is used as a counter electrode, a saturated calomel electrode is used as a reference electrode, mixed solution of carbon oxide nanometer tubes, dodecylbenzene sulfonic acid, sodium dodecyl benzene sulfonate and pyrrole is used as electrolyte, and electrochemical circulation volt-ampere oxidation polymerization reaction is used for preparing the carbon nanometer tube/polypyrrole/graphite felt composite electrode. The carbon nanometer tube/polypyrrole/graphite felt composite electrode and the preparing method have the advantages that the prepared composite electrode has high specific capacitance and excellent circulation stability, in addition, the preparing condition is mild, the process is simple, the operation is controllable, and obvious social and economic benefits are realized.

Description

A kind of carbon nano-tube/poly pyrroles/graphite felt combination electrode and preparation method thereof
Technical field
The invention belongs to the preparation field of electrode for super capacitor, be specifically related to a kind of carbon nano-tube/poly pyrroles/graphite felt combination electrode and its preparation method and application.
Background technology
Polypyrrole is simple with its preparation, it is reversible to adulterate, environmental friendliness, conductance is high, larger than electric capacity, film forming is excellent and receive much concern.Meanwhile, nano-carbon material can further improve mechanics and the electric property of polypyrrole.P. M. Ajayan(P. M. Ajayan, O. Stephan, C. Colliex, D. Trauth. Science, 1994, 26:1212-1214), Gaoyi Han(Gaoyi Han, Jinying Yuan, Gaoquan Shi, Fei Wei. Thin Solid Films, 2005, 474:64-69), Hamed Arami(Hamed Arami, Mahyar Mazloumi, Razieh Khalifehzadeh, Shahriar Hojjati Emami, S.K. Sadrnezhaad. Materials Letters, 2007, 61:4412-4415), Yeon-Kyeong Lee(Yeon-Kyeong Lee, Keum-Ju Lee, Dae-Sung Kim, Dong-Jin Lee, Jin-Yeol Kim. Synthetic Metals, 2010, 160:814-818) with J. Li(J. Li, H.Q. Xie, Y. Li. Advanced Materials Research, 2012,399-401:1415-1418) etc. prepared the multiple Pt/Polypyrrole composite material containing nano-carbon material.Research is found, containing the Pt/Polypyrrole composite material of nano-carbon material, in the inverting element electrode material fields such as ultracapacitor, secondary cell, has broad application prospects.
Polypyrrole combination electrode material containing nano-carbon material can be prepared by several different methods.E. Frackowiak(E. Frackowiak, V. Khomenko, K. Jurewicz, K. Lota, F. B é guin. Journal of Power Sources, 2006,153:413-418) find that the polypyrrole carbon nano tube compound material of being prepared by chemical method has good cyclical stability, in the voltage range of 0.4 V, when cycle charge-discharge exceedes 3000 cycles, than electric capacity, can be stabilized in 160 Fg -1.Ren Xiangzhong (Ren Xiangzhong, Zhao Qi, Liu Jianhong, Gu Yi. polymer material science and engineering, 2008,24(10): 29-32) adopt electrochemical process to synthesize PPy/MWCNT conductive composite film, find compared with pure PPy film, PPy/MWCNT conductive composite film surface is more coarse, loose, has more excellent electronics transfer behavior.Yueping Fang(Yueping Fang, Jianwei Liu, Deok Jin Yu, James P. Wicksted, Kaan Kalkan, C. Ozge Topal, Bret N. Flanders, Judy Wu, Jun Li. Journal of Power Sources, 2010,195:674-679) method by pulse electrodeposition is coated in polypyrrole in carbon nano-tube, to form homogeneous film, the MWCNT-PPy film that obtains self-supporting, reaches 427 Fg than electric capacity -1.Q. Fu(Q. Fu, B. Gao, H. Dou, L. Hao, X. Lu, K. Sun, J. Jiang, X. Zhang. Synthetic Metals, 2011,161:373-378) adopt in-situ chemical method to synthesize the nano composite material of sulfonation multi-walled carbon nano-tubes and polypyrrole, find that this material has stable ratio electric capacity, reaches 357 Fg -1, after the cycle charge-discharge in 1000 cycles, than electric capacity, only lose 3 %.
At present, Pt/Polypyrrole composite material containing nano-carbon material has good conductivity, stability, environment friendly and mechanical performance, but composite material preparation process complexity, lower than electric capacity, greatly limit its application on electrode material for super capacitor, still needed further strengthening research.
Summary of the invention
The object of the present invention is to provide a kind of carbon nano-tube/poly pyrroles/graphite felt combination electrode and its preparation method and application, combination electrode prepared by the present invention not only has higher ratio electric capacity and more excellent cyclical stability, and have preparation condition gentleness, technique simple, operate the advantages such as controlled, possess significant social and economic effects.
For achieving the above object, the present invention adopts following technical scheme:
A kind of carbon nano-tube/poly pyrroles/graphite felt combination electrode is using oxidation pre-treatment graphite felt as carrier, using carbon nano-tube and DBSA radical ion codope polypyrrole as electrode operation material.
The method of preparing carbon nano-tube/poly pyrroles/graphite felt combination electrode as above comprises the following steps:
(1) take 20 ~ 200 mg oxide/carbon nanometer tube (Xin Yudong, Liu Xiaodong; Cabonic acid oxidation modification. East China Institute of Technology's journal (natural science edition), 2010,33(1): 75-78) be placed in 100 mL deionized waters, ultrasonic 1 ~ 10 h, add DBSA and neopelex, ultrasonic 10 ~ 40 min, controlling DBSA radical ion concentration in solution is 0.05 ~ 0.3 mol/L; Add pyrroles, the mol ratio of controlling pyrroles and DBSA radical ion is 2 ~ 0.5:1, and ultrasonic 10 ~ 40 min obtain oxide/carbon nanometer tube, DBSA, neopelex and pyrroles's mixed solution;
(2) adopt three-electrode system, with oxidation pre-treatment graphite felt, (mulberry business is refined for Li Xiaogang, Huang Kelong, Tan Ning, Liu Suqin, Chen Liquan; Catalysis of graphite felt electrode treated with electrochemical oxidation VO 2+/ VO 2 +the catalytic activity that electricity is right. functional material, 2006,37(7): 1084-1086) as work electrode, platinum filament is as to electrode, saturated calomel electrode is as reference electrode, the mixed solution that step (1) makes is as electrolyte, carry out electrochemistry cyclic voltammetric oxidative polymerization, voltage scan range is-0.2 V ~ 1.5 V, and sweep speed is 10 ~ 100 mV/s, scan round 20 ~ 80 circles, take out work electrode, repeatedly rinse with ethanol and deionized water, vacuumize, obtains described carbon nano-tube/poly pyrroles/graphite felt combination electrode.
Described carbon nano-tube/poly pyrroles/graphite felt combination electrode is mainly applicable to prepare ultracapacitor.
Remarkable advantage of the present invention is: preparation condition gentleness of the present invention, technique be simple, it is controlled to operate, prepared high specific capacitance polypyrrole/graphite felt combination electrode is when charging and discharging currents density is respectively 1 g/A, 2 g/A, 4 g/A and 10 g/A, than electric capacity respectively up to 809 F/g, 617 F/g, 468 F/g and 354 F/g, discharge and recharge after 1000 times, than capacitance fade 12.8 %.
Accompanying drawing explanation
Fig. 1 is the scanning electron microscope (SEM) photograph (15000 times) of carbon nano-tube/poly pyrroles/graphite felt composite material.
Fig. 2 is the scanning electron microscope (SEM) photograph (5000 times) of carbon nano-tube/poly pyrroles/graphite felt composite material.
Fig. 3 is the scanning electron microscope (SEM) photograph (1000 times) of carbon nano-tube/poly pyrroles/graphite felt composite material.
Embodiment
Embodiment 1
(1) preparation of the aqueous solution of carbon nano-tube, DBSA, neopelex and pyrroles's mixture: take 200 mg oxide/carbon nanometer tubes and be placed in 100 mL deionized waters, ultrasonic 10 h, prepare finely dispersed carbon nano-tube aqueous solutions; To adding mol ratio in the above-mentioned aqueous solution, be the DBSA of 1:1 and the mixture of neopelex, ultrasonic 20 min, controlling DBSA radical ion concentration in the aqueous solution is 0.1 mol/L; The pyrroles that to take with DBSA radical ion mol ratio be 1:1 is placed in the above-mentioned aqueous solution, and ultrasonic 20 min obtain the aqueous solution of oxide/carbon nanometer tube, DBSA, neopelex and pyrroles's mixture.
(2) preparation of carbon nano-tube/poly pyrroles/graphite felt combination electrode: adopt three-electrode system, using oxidation pre-treatment graphite felt as work electrode, platinum filament is as to electrode, saturated calomel electrode is as reference electrode, the aqueous solution that step (1) makes is as electrolyte, utilize electrochemistry cyclic voltammetric oxidative polymerization, V ~ 1.5, voltage scan range-0.2 V, sweep speed 50 mV/s, scan round 40 is enclosed, take out work electrode, repeatedly rinse with ethanol and deionized water, vacuumize obtains using oxidation pre-treatment graphite felt as carrier, combination electrode using carbon nano-tube and DBSA radical ion codope polypyrrole as electrode operation material, be described high specific capacitance carbon nano-tube/poly pyrroles/graphite felt combination electrode.
The stereoscan photograph of carbon nano-tube/poly pyrroles/graphite felt composite material as Figure 1-3.As can be seen from the figure, the carbon nano-tube of the about 60nm of diameter and polypyrrole are evenly compound, and meanwhile, carbon nano-tube and Pt/Polypyrrole composite material are wrapped in again graphite felt fiber surface.
Using 0.5 mol/L dilute sulfuric acid as electrolyte, record this combination electrode when charging and discharging currents density is respectively 1 g/A, 2 g/A, 4 g/A and 10 g/A, than electric capacity, respectively up to 450 F/g, 308 F/g, 213 F/g and 142 F/g, discharge and recharge after 1000 times, than capacitance fade 23.2 %.
Embodiment 2
(1) preparation of the aqueous solution of carbon nano-tube, DBSA, neopelex and pyrroles's mixture: take 120 mg oxide/carbon nanometer tubes and be placed in 100 mL deionized waters, ultrasonic 8 h, prepare finely dispersed carbon nano-tube aqueous solutions; To adding mol ratio in the above-mentioned aqueous solution, be the DBSA of 1:1 and the mixture of neopelex, ultrasonic 20 min, controlling DBSA radical ion concentration in the aqueous solution is 0.1 mol/L; The pyrroles that to take with DBSA radical ion mol ratio be 1:1 is placed in the above-mentioned aqueous solution, and ultrasonic 20 min obtain the aqueous solution of oxide/carbon nanometer tube, DBSA, neopelex and pyrroles's mixture.
(2) preparation of carbon nano-tube/poly pyrroles/graphite felt combination electrode: adopt three-electrode system, using oxidation pre-treatment graphite felt as work electrode, platinum filament is as to electrode, saturated calomel electrode is as reference electrode, the aqueous solution that step (1) makes is as electrolyte, utilize electrochemistry cyclic voltammetric oxidative polymerization, V ~ 1.5, voltage scan range-0.2 V, sweep speed 50 mV/s, scan round 40 is enclosed, take out work electrode, repeatedly rinse with ethanol and deionized water, vacuumize obtains using oxidation pre-treatment graphite felt as carrier, combination electrode using carbon nano-tube and DBSA radical ion codope polypyrrole as electrode operation material, be described high specific capacitance carbon nano-tube/poly pyrroles/graphite felt combination electrode.
Using 0.5 mol/L dilute sulfuric acid as electrolyte, record this combination electrode when charging and discharging currents density is respectively 1 g/A, 2 g/A, 4 g/A and 10 g/A, than electric capacity, respectively up to 679 F/g, 541 F/g, 413 F/g and 293 F/g, discharge and recharge after 1000 times, than capacitance fade 15.2 %.
Embodiment 3
(1) preparation of the aqueous solution of carbon nano-tube, DBSA, neopelex and pyrroles's mixture: take 80 mg oxide/carbon nanometer tubes and be placed in 100 mL deionized waters, ultrasonic 6 h, prepare finely dispersed carbon nano-tube aqueous solutions; To adding mol ratio in the above-mentioned aqueous solution, be the DBSA of 1:1 and the mixture of neopelex, ultrasonic 20 min, controlling DBSA radical ion concentration in the aqueous solution is 0.1 mol/L; The pyrroles that to take with DBSA radical ion mol ratio be 1:1 is placed in the above-mentioned aqueous solution, and ultrasonic 20 min obtain the aqueous solution of oxide/carbon nanometer tube, DBSA, neopelex and pyrroles's mixture.
(2) preparation of carbon nano-tube/poly pyrroles/graphite felt combination electrode: adopt three-electrode system, using oxidation pre-treatment graphite felt as work electrode, platinum filament is as to electrode, saturated calomel electrode is as reference electrode, the aqueous solution that step (1) makes is as electrolyte, utilize electrochemistry cyclic voltammetric oxidative polymerization, V ~ 1.5, voltage scan range-0.2 V, sweep speed 50 mV/s, scan round 40 is enclosed, take out work electrode, repeatedly rinse with ethanol and deionized water, vacuumize obtains using oxidation pre-treatment graphite felt as carrier, combination electrode using carbon nano-tube and DBSA radical ion codope polypyrrole as electrode operation material, be described high specific capacitance carbon nano-tube/poly pyrroles/graphite felt combination electrode.
Using 0.5 mol/L dilute sulfuric acid as electrolyte, record this combination electrode when charging and discharging currents density is respectively 1 g/A, 2 g/A, 4 g/A and 10 g/A, than electric capacity, respectively up to 809 F/g, 617 F/g, 468 F/g and 354 F/g, discharge and recharge after 1000 times, than capacitance fade 12.8 %.
Embodiment 4
(1) preparation of the aqueous solution of carbon nano-tube, DBSA, neopelex and pyrroles's mixture: take 40 mg oxide/carbon nanometer tubes and be placed in 100 mL deionized waters, ultrasonic 5 h, prepare finely dispersed carbon nano-tube aqueous solutions; To adding mol ratio in the above-mentioned aqueous solution, be the DBSA of 1:1 and the mixture of neopelex, ultrasonic 20 min, controlling DBSA radical ion concentration in the aqueous solution is 0.1 mol/L; The pyrroles that to take with DBSA radical ion mol ratio be 1:1 is placed in the above-mentioned aqueous solution, and ultrasonic 20 min obtain the aqueous solution of oxide/carbon nanometer tube, DBSA, neopelex and pyrroles's mixture.
(2) preparation of carbon nano-tube/poly pyrroles/graphite felt combination electrode: adopt three-electrode system, using oxidation pre-treatment graphite felt as work electrode, platinum filament is as to electrode, saturated calomel electrode is as reference electrode, the aqueous solution that step (1) makes is as electrolyte, utilize electrochemistry cyclic voltammetric oxidative polymerization, V ~ 1.5, voltage scan range-0.2 V, sweep speed 50 mV/s, scan round 40 is enclosed, take out work electrode, repeatedly rinse with ethanol and deionized water, vacuumize obtains using oxidation pre-treatment graphite felt as carrier, combination electrode using carbon nano-tube and DBSA radical ion codope polypyrrole as electrode operation material, be described high specific capacitance carbon nano-tube/poly pyrroles/graphite felt combination electrode.
Using 0.5 mol/L dilute sulfuric acid as electrolyte, record this combination electrode when charging and discharging currents density is respectively 1 g/A, 2 g/A, 4 g/A and 10 g/A, than electric capacity, respectively up to 717 F/g, 553 F/g, 414 F/g and 325 F/g, discharge and recharge after 1000 times, than capacitance fade 11.3 %.
Embodiment 5
(1) preparation of the aqueous solution of carbon nano-tube, DBSA, neopelex and pyrroles's mixture: take 20 mg oxide/carbon nanometer tubes and be placed in 100 mL deionized waters, ultrasonic 2 h, prepare finely dispersed carbon nano-tube aqueous solutions; To adding mol ratio in the above-mentioned aqueous solution, be the DBSA of 1:1 and the mixture of neopelex, ultrasonic 20 min, controlling DBSA radical ion concentration in the aqueous solution is 0.1 mol/L; The pyrroles that to take with DBSA radical ion mol ratio be 1:1 is placed in the above-mentioned aqueous solution, and ultrasonic 20 min obtain the aqueous solution of oxide/carbon nanometer tube, DBSA, neopelex and pyrroles's mixture.
(2) preparation of carbon nano-tube/poly pyrroles/graphite felt combination electrode: adopt three-electrode system, using oxidation pre-treatment graphite felt as work electrode, platinum filament is as to electrode, saturated calomel electrode is as reference electrode, the aqueous solution that step (1) makes is as electrolyte, utilize electrochemistry cyclic voltammetric oxidative polymerization, V ~ 1.5, voltage scan range-0.2 V, sweep speed 50 mV/s, scan round 40 is enclosed, take out work electrode, repeatedly rinse with ethanol and deionized water, vacuumize obtains using oxidation pre-treatment graphite felt as carrier, combination electrode using carbon nano-tube and DBSA radical ion codope polypyrrole as electrode operation material, be described high specific capacitance carbon nano-tube/poly pyrroles/graphite felt combination electrode.
Using 0.5 mol/L dilute sulfuric acid as electrolyte, record this combination electrode when charging and discharging currents density is respectively 1 g/A, 2 g/A, 4 g/A and 10 g/A, than electric capacity, respectively up to 625 F/g, 476 F/g, 363 F/g and 287 F/g, discharge and recharge after 1000 times, than capacitance fade 10.0 %.
The foregoing is only preferred embodiment of the present invention, all equalizations of doing according to the present patent application the scope of the claims change and modify, and all should belong to covering scope of the present invention.

Claims (4)

1. carbon nano-tube/poly pyrroles/graphite felt combination electrode, is characterized in that: described combination electrode is using oxidation pre-treatment graphite felt as carrier, using carbon nano-tube and DBSA radical ion codope polypyrrole as electrode operation material.
2. a method of preparing carbon nano-tube/poly pyrroles/graphite felt combination electrode as claimed in claim 1, is characterized in that: comprise the following steps:
(1) preparation oxide/carbon nanometer tube, DBSA, neopelex and pyrroles's mixed solution;
(2) using oxidation pre-treatment graphite felt as work electrode, platinum filament is as to electrode, saturated calomel electrode is as reference electrode, and the mixed solution of step (1) preparation, as electrolyte, utilizes electrochemistry cyclic voltammetric oxidative polymerization to prepare carbon nano-tube/poly pyrroles/graphite felt combination electrode.
3. the preparation method of carbon nano-tube/poly pyrroles/graphite felt combination electrode according to claim 2, is characterized in that: concrete steps are as follows:
(1) take 20 ~ 200 mg oxide/carbon nanometer tubes and be placed in 100 mL deionized waters, ultrasonic 1 ~ 10 h, add DBSA and neopelex, ultrasonic 10 ~ 40 min, controlling DBSA radical ion concentration in solution is 0.05 ~ 0.3 mol/L; Add pyrroles, the mol ratio of controlling pyrroles and DBSA radical ion is 2 ~ 0.5:1, and ultrasonic 10 ~ 40 min obtain oxide/carbon nanometer tube, DBSA, neopelex and pyrroles's mixed solution;
(2) adopt three-electrode system, using oxidation pre-treatment graphite felt as work electrode, platinum filament is as to electrode, saturated calomel electrode is as reference electrode, the mixed solution that step (1) makes is as electrolyte, carry out electrochemistry cyclic voltammetric oxidative polymerization, voltage scan range is-0.2 V ~ 1.5 V, sweep speed is 10 ~ 100 mV/s, scan round 20 ~ 80 circle, takes out work electrode, repeatedly rinses with ethanol and deionized water, vacuumize, obtains described carbon nano-tube/poly pyrroles/graphite felt combination electrode.
4. an application for carbon nano-tube/poly pyrroles/graphite felt combination electrode as claimed in claim 1, is characterized in that: described carbon nano-tube/poly pyrroles/graphite felt combination electrode is for the preparation of ultracapacitor.
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