CN101800131B - Active carbon-based material and preparation method thereof - Google Patents

Active carbon-based material and preparation method thereof Download PDF

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CN101800131B
CN101800131B CN2010101235557A CN201010123555A CN101800131B CN 101800131 B CN101800131 B CN 101800131B CN 2010101235557 A CN2010101235557 A CN 2010101235557A CN 201010123555 A CN201010123555 A CN 201010123555A CN 101800131 B CN101800131 B CN 101800131B
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carbon
based material
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polyaniline
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CN101800131A (en
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刘恩辉
李利民
李剑
向晓霞
黄铮铮
杨艳静
沈海杰
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Xiangtan University
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Abstract

The invention provides an active carbon-based material and a preparation method thereof. The carbon-based material comprises the following components based on parts by weight percent: 50-90% of carbon, 0.1-35% of oxygen, 0.1-35% of nitrogen, 0.0%-10% of sulphur, 0.0%-15% of phosphorus and 0.0-15% of boron. The preparation method comprises the following step of carbonizing doped or undoped polyaniline polymer at 500-1200 DEG C for 1-24h under the protection of inert gas. Heteroatom N, O, S, P, B, H and group thereof are induced to the carbon atom to change the chemical environment of the carbon atom and increase the space charge density of the carbon atom and the polarity of the material, so that the material has surface standard faraday capacitance and double electric layer capacitance, and has higher specific capacity, good electrical conductivity, and higher energy density and power density under the condition that the specific surface area is not increased. The preparation method of the active carbon-based material has the advantages of simple technology, easily-obtained raw materials, low cost, small pollution and being capable of being produced on a large scale.

Description

A kind of active carbon-based material and preparation method thereof
Technical field
The present invention relates to a kind of active carbon-based material and preparation method thereof, relate in particular to a kind of a kind of active carbon-based material that is used for ultracapacitor and lithium ion battery negative and preparation method thereof.
Background technology
Ultracapacitor (Supercapacitor) is claimed electric chemical super capacitor (Electrochemical Supercapacitor) again, is a kind of new energy storage device between battery and conventional electrostatic capacitor.Electrode material is the core part of ultracapacitor, and its structure and performance are directly determining the quality of a ultracapacitor performance.Electrode material mainly contains three types: carbon-based material, conducting polymer materials and metal oxide materials.Material with carbon element because have porous, big specific area, chemical stability is good, with low cost and advantage such as long service life; As the double electric layers supercapacitor electrode material; Can obtain better electrochemical performance, thus the capacitor that uses at present mostly with material with carbon element as work electrode.But existing ultracapacitor material with carbon element; Mainly be specific area and the control hole structure that rely on to improve material with carbon element itself improves the capacitance of its electric double layer, thereby developed porous carbon and the carbon nanomaterial of various forms of the high-specific surface area of carbon aerogels, various pore structures; But, increase substantially material with carbon element specific area and hole voidage, can cause the appearance of degradation problem under contact performance decline, conductivity variation, the volume and capacity ratio between its particle and the particle; Though and the specific area of its formation is big but effective ratio area is less, thereby causes the energy density of ultracapacitor and power density to be in very low level, limits its application.Moreover the space that its specific area improves is very limited.
Summary of the invention
To above problem, the invention provides contain hetero-atom N, O, S, P, B, H and group thereof ultracapacitor with active carbon-based material and preparation method thereof.On carbon atom, introduce hetero-atom N, O, S, P, B, H and group thereof; Change carbon atom chemical environment, increase its space charge density and polarity; Make material have surperficial accurate faraday's electric capacity and electric double layer capacitance, realize that active material has higher specific capacity, excellent conducting performance, high energy density and power density when not increasing specific area.
For solving the problems of the technologies described above; Technical scheme provided by the invention is: a kind of active carbon-based material; The quality of each element composition percentage composition is in the carbon-based material: carbon 50%~90%, oxygen 0.1%~35%, nitrogen 0.1%~35%, sulphur 0.0%~10%, phosphorus 0.0%~15%, boron 0.0%~15%.
The technology of the active carbon-based material that the ultracapacitor that the present invention also provides a kind of simple preparation to contain hetero-atom N, O, S, P, B, H and group thereof is used.Absorbent charcoal material has that cheapness, source are wide, environmental friendliness, chemically stable, low-density, good heat conduction and electric conductivity, better machining property.The preparation method who is above-mentioned active carbon-based material is, under the protection of inert gas, will mix or plain polyaniline polymer, makes char-forming material at 500 ℃~1200 ℃ carbonization 1h~24h.
Further: in the preparation method of above-mentioned active carbon-based material, it comprises that also the material after the carbonization carries out the step of high-temperature activation or solution activation processing again, to improve its specific area, wettability and surface functional group.Described high-temperature activation is to carry out high-temperature activation after activator and char-forming material are mixed to handle; Said activator is 0.1~5 with the quality of char-forming material than scope; Temperature ranges is 100 ℃~1000 ℃, and constant temperature time is 0~20h, and heat treated gas atmosphere is N 2, Ar, CO 2, H 2In O steam or oxygen and the inert gas one or more and be 1%~90% mixed atmosphere with percent by volume.Said solution chemistry activation is to be 0.1molL with char-forming material in concentration -1~10molL -1H 2SO 4, HNO 3, soak in one or more aqueous solution among the HCl, potassium permanganate, hydrogen peroxide, ammonium persulfate, soaking temperature is 10 ℃~100 ℃, soak time is 30min~96h.Clean to noresidue then for final products.
Perhaps, in the preparation method of above-mentioned active carbon-based material, it comprises that also the activation step that carries out simultaneously with carbonization is following: will mix earlier or plain polyaniline polymer to be put into concentration be 0.1molL -1~10molL -1Flood 1h~60h in the activator solution, through super-dry, the quality that obtains activator and polymer is 0.1~5 precursor mixture than scope; Be that 400 ℃~1000 ℃, constant temperature time are that 0~20h, heat treatment environment atmosphere are N with the precursor mixture of gained in temperature range then 2, Ar, CO 2, H 2In O steam or oxygen and the inert gas one or more are 1%~90% mixed atmosphere with percent by volume, carry out synchronous carbonization and activation processing.Make through cleaning again with drying process.
Further again: carry out simultaneously among the preparation method of active carbon-based material of activation in above-mentioned and carbonization, described activator is KOH, NaOH, ZnCl 2, H 3PO 4, H 3BO 3, in sodium salt and the sylvite aqueous solution one or more.Described doping or plain polyaniline polymer be utilize aniline monomer, through chemical polymerization or electrochemical polymerization, the method synthesizing blender or the plain polyaniline polymer that adopt protonic acid doping or go to mix.
Described chemical polymerization is meant following process:
1. aniline monomer is dissolved in Bronsted acid, wiring solution-forming A; 2. oxidant is made into 0.5~2mol/L solution B with distilled water or deionized water, wherein the mol ratio of oxidant and organic monomer is 0.1~10 among the B; 3. solution A is transferred in the reactor and stirred, be added drop-wise to solution B in the reaction bulb again, two kinds of solution polymerization reaction take places, the reaction time is 1h~30h, and the reaction room temperature is-5 ℃~50 ℃, and the mode that course of reaction is taked to stir, leave standstill or the two combines is carried out; 4. after reaction finishes, product washing being separated several times, after filtrating is neutrality, is 50 ℃~100 ℃, normal pressure or vacuumize 2h~12h obtain the mixing polyaniline of attitude in temperature.Described oxidant is persulfate, chloric acid or perchlorate, KMnO 4, HClO 4, CuCl 2, Ce (SO 4) 2, H 2O 2, trivalent soluble ferric iron salt, V 2O 5, MnO 2In the mixture of one or more aqueous solution.
Described electrochemical polymerization is meant following process: 1. aniline monomer and Bronsted acid are made into mixed electrolyte solutions, wherein the concentration of aniline is 0.01molL -1~3.0molL -1, Bronsted acid concentration be 0.1molL -1~5molL -1, aniline and Bronsted acid mol ratio be 0.05~5; 2. the electrode that adopted of aniline electrochemical polymerization comprises carbon electrode, lead and alloy electrode thereof, lead dioxide electrode, stainless steel electrode, nickel and alloy electrode thereof, titanium and alloy electrode thereof, conductive glass electrode or noble metal electrode; The shape of electrode comprises plate electrode, mesh electrode, stick electrode; 3. the constant potential polymerization is adopted in the electrochemical polymerization of aniline, and potential range is that 0.4V~3.0V, current density are 0.1Adm -2~10Adm -2Perhaps adopt electrokinetic potential scanning polymerization, potential range is that 0.4V~3.0V, electric potential scanning speed are 1mVs -1~300mVs -1, polymerization time is 10min~20h; Polymerization temperature is 5 ℃~50 ℃; The alr mode of electrolyte is gas agitation, mechanical agitation or does not stir; 4. after reaction finishes, product washing being separated several times, after filtrating is neutrality, is 50 ℃~100 ℃, normal pressure or vacuumize 2h~12h obtain the mixing polyaniline of attitude in temperature.Described Bronsted acid is H 2SO 4, HCl, HClO 4, HNO 3, H 3PO 4, H 3BO 3, CH 3In CHOOH, CHOOH, benzoic acid, p-methyl benzenesulfonic acid, citric acid, the oxalic acid one or more.Said method of going to mix is meant that claim 7 or 8 described polyaniline polymer carry out dedoping with ammonia spirit dipping 2h~36h of 1%~20%; The solid-to-liquid ratio of doped polyaniline and ammonia spirit is 0.01~10; Repeatedly reach 7.0 with distilled water or deionized water wash separation behind the dedoping, or promptly obtain plain polyaniline 1~2 time with the ethanol cleaning again until pH.
The present invention compares prior art and has the following advantages:
The invention provides active carbon-based material that the ultracapacitor that contains hetero-atom N, O, S, P, B, H and group thereof uses and preparation method thereof.On carbon atom, introduce hetero-atom N, O, S, P, B, H and group thereof; Change carbon atom chemical environment, increase the polarity of its space charge density and molecule; Make material have surperficial accurate faraday's electric capacity and electric double layer capacitance, realize that active material has higher specific capacity, excellent conducting performance, high energy density and power density when not increasing specific area.Absorbent charcoal material has that cheapness, source are wide, environmental friendliness, chemically stable, low-density, good heat conduction and electric conductivity, better machining property.Active carbon is to collect rice space, ultramicron and Surface Physical Chemistry characteristic in the new material of one.Have abundant hole institutional framework and surface chemical structure.So absorbent charcoal material is widely used as many aspects such as adsorbent, catalyst carrier, filter membrane, electrode material.The preparation of novel carbon-based material and application study thereof are one of forward position and the focuses in current investigation of materials field; In the preparation active carbon, its hole institutional framework and surface chemical structure are regulated and control; Be not only perfect and development, and help further to expand the application of raw material of wood-charcoal material the absorbent charcoal material research system.The preparation method of doping active carbon-based material provided by the invention has advantages such as technology is simple, raw material is easy to get, cost is low, pollution is little, can be mass-produced, and is easy to industrialization.
Description of drawings
(current density is 1Ag to Fig. 1 for the constant current charge-discharge curve of the ultracapacitor be made up of the carbon-based material of embodiment 1 preparation -1).
Fig. 2 is the AC impedance figure of the ultracapacitor be made up of the carbon-based material of embodiment 2 preparation.
Ultracapacitor the continuous charge and discharge circulation life figure under different electric current density of Fig. 3 for forming by the carbon-based material of embodiment 3 preparations.
Fig. 4 is the cyclic voltammogram of ultracapacitor under different scanning rates of being made up of the carbon-based material of embodiment 4 preparations.
Fig. 5 is the scanning electron microscope diagram SEM of the carbon-based material of embodiment 5 preparations.
Embodiment
Purport of the present invention is on carbon atom, to introduce hetero-atom N, O, S, P, B, H and group thereof; Change carbon atom chemical environment, increase the polarity of its space charge density and molecule; Make material have surperficial accurate faraday's electric capacity and electric double layer capacitance, realize that active material has higher specific capacity, excellent conducting performance, high energy density and power density when not increasing specific area.The preparation method of doping active carbon-based material provided by the invention has advantages such as technology is simple, raw material is easy to get, cost is low, pollution is little, can be mass-produced, and is easy to industrialization.Below in conjunction with embodiment content of the present invention is done further to detail, mentioned content is not to qualification of the present invention among the embodiment, and the time in the method and the selection of temperature can be suited measures to local conditions and the result is not had substantial effect.
Embodiment 1
(1) 1.86mL aniline (AN) is dissolved in 25mLH 2SO 4Middle wiring solution-forming A, 1.14g ammonium persulfate (APS) is dissolved in wiring solution-forming B in 50mL distilled water or the deionized water ([APS]/[AN]=1: 4); (2) solution A is changed in the reaction bulb, be added drop-wise to B in the reaction bulb under stirring, after dripping off, room temperature reaction 4h; (3) collect product in the reaction bulb, water, ethanol or acetone is washed product repeatedly, is neutral until cleaning solution; (4) product after will washing obtains the polyaniline that sulfuric acid mixes in 60 ℃ of vacuumize 48h; (5) at inert gas N 2Protection is descended polyaniline at 800 ℃ of carbonization 2h; (6) the char-forming material activation processing constant temperature 2h in 200 ℃ water vapour that makes above the general, cool to room temperature promptly obtains N, O, the atom doped activated carbon sill of S.Each component and the quality thereof of the active carbon-based material that obtains mixing through the test of elementary analysis and x-ray photoelectron power spectrum (XPS) than content are: carbon C content is 78.95%; Oxygen O content is 12.21%; Nitrogen N content is 7.118%, and sulphur S content is 0.257%, and hydrogen H content is 1.446%.The not activated sample code name that this embodiment makes is that C800, activated sample code name are CA800.
C800 and CA800 with preparation are that electrode active material C, acetylene black AB are that conductive agent, polyvinylidene fluoride PVDF are binding agent, and the mass ratio of C: AB: PVDF is to make the electrode of ultracapacitor at 80: 10: 10.At first, active material C is mixed with acetylene black, fully grinds, then ground powder is fully mixed with PVDF in being dissolved in N-N-methyl-2-2-pyrrolidone N-NMP; Mix well pulping; Be uniformly coated on then on the collector nickel foil, dry 10h under 90 ℃ promptly gets electrode slice.With 6molL -1KOH solution is electrolyte, is assembled into two electrode system ultracapacitors of symmetry, and in 0~1V voltage range, the CHI660A electrochemical workstation that utilizes Shanghai occasion China instrument company to produce carries out charge-discharge test.Fig. 1 representes the charge-discharge test result of the ultracapacitor that the sample of embodiment 1 preparation is made.Time by the charging and discharging curve among Fig. 1 can find out that CA800 has much longer discharging and recharging the time under identical current density, and the specific capacity of this explanation CA800 sample is much bigger.
Embodiment 2
(1) 1.86mL aniline is dissolved in 25mLH 2SO 4Middle wiring solution-forming A, the 2.28g ammonium persulfate is dissolved in wiring solution-forming B in 50mL distilled water or the deionized water ([APS]/[AN]=1: 2); (2) after rapid mixing stirs 1min in reaction bulb with solution A and solution B, with its standing and reacting 10h at room temperature; (3) collect product in the reaction bulb, water, ethanol or acetone is washed product repeatedly, is neutral until cleaning solution; (4) product after will washing is in 60 ℃ of vacuumize 48h, the polyaniline that obtains mixing; (5) at inert gas N 2Protection is descended polyaniline at 800 ℃ of carbonization 2h; (6) will above the char-forming material that makes at 10 ℃~40 ℃ 1molL -1Soak 24h in the salpeter solution and carry out activation processing, promptly obtain the material with carbon element of activation again through washing, drying, ball milling.The not activated sample code name that this embodiment makes is that C800, activated sample code name are CA800.
Electrode making in the present embodiment, the assembling of ultracapacitor, tester are with embodiment 1.Fig. 2 is that 5mV, temperature are to carry out under the condition of room temperature for this embodiment at test frequency scope 0.01Hz~100KHz, voltage amplitude.AC impedance curve by among Fig. 2 finds out, CA800 than C800 have littler impedance, straight line portion has bigger slope, the sample after this explanation activation has better charge transmission and better capacitance characteristic.
Embodiment 3
(1) 20mmol aniline and the HAc of 20mmol are ultrasonic mixes about 2min and gets A; (2) 25mmolAPS is dissolved among the HAc of 20mmol, the ultrasonic about 2min of abundant dissolving mixing that makes gets B.(3) mix about 2min with A and B are ultrasonic under room temperature, then at room temperature standing and reacting 8h.(3) collecting reaction product, the water washed product is neutral until cleaning solution; (4) product after will washing is in 60 ℃ of vacuumize 24h, the polyaniline that obtains mixing; (5) at inert gas N 2Protection is descended polyaniline at 800 ℃ of carbonization 4h; (6) after char-forming material that makes above the general and NaOH mix, 700 ℃ of activation 2h (mass ratio of carbon and NaOH is 2: 1) under nitrogen protection, warp washing again, drying, ball milling promptly obtain the carbon-based material of activation.
Electrode making in the present embodiment, the assembling of ultracapacitor, tester are with embodiment 1.In the cycle life curve such as Fig. 3 of the ultracapacitor that the sample behind overactivation makes.Curve by among Fig. 3 is found out, is respectively 1Ag in current density -1, 3Ag -1And 5Ag -1Condition under continuous charge and discharge cycles 10000 times respectively, its specific capacity keeps 260Fg respectively -1, 230Fg -1, 180Fg -1, decay hardly.Current density is by 1Ag -1Be increased to 5Ag -1, it still keeps 1Ag than electric capacity -1Under the condition 69%.These data declarations, the capacitor of prepared material have current ratio characteristic and good circulation life characteristic preferably.
Embodiment 4
(1) 1.86mL aniline is dissolved in 25mLH 2SO 4Middle wiring solution-forming A, the 3.42g ammonium persulfate is dissolved in wiring solution-forming B in 50mL distilled water or the deionized water ([APS]/[AN]=1: 1); (2) solution A is changed in the reaction bulb, be added drop-wise to B in the reaction bulb under stirring, after dripping off, room temperature reaction 8h; (3) collect product in the reaction bulb, water, ethanol or acetone is washed product repeatedly, is neutral until cleaning solution; (4) product after will washing is in 60 ℃ of vacuumize 10h, the polyaniline that obtains mixing; (5) with the polyaniline and the activator K that prepare 2CO 3Solution impregnation (polyaniline and K 2The mass ratio of CO3 is 2: 1), 105 ℃ of dryings promptly obtain K then 2CO 3The polyaniline precursor material of dipping; (6) with polyaniline precursor material at N 2Under the Buchholz protection, at 600 ℃ of following carbonization constant temperature 1h; After naturally cooling to room temperature, with it at first at 1molL -1H 2SO 4Wash, in deionized water, clean to again till the pH value neutrality, promptly obtain the carbon-based material of the hetero-atom doping of activation.
Electrode making in the present embodiment, the assembling of ultracapacitor, tester are with embodiment 1.Sample sets through after synchronous carbonization and the activation is dressed up the cyclic voltammetric test result of ultracapacitor such as the curve among Fig. 4.Being respectively in sweep speed among Fig. 4 is 2mVs -1, 5mVs -1, 10mVs -1And 20mVs -1Cyclic voltammetry curve under the condition.Can find out by the curve among Fig. 4, be the curve that is similar to rectangular symmetrical.This explanation, the capacitor of prepared material has desirable capacitance characteristic.Unipolarly adopt formula to calculate than electric capacity:
C = 2 I vm
C, I, m and v represent that respectively ultracapacitor is unipolar than electric capacity (Fg in the formula -1), cyclic voltammetry curve intermediate potential point current corresponding (A), quality of activated carbon (g) and sweep speed (Vs -1).Sweep speed is 5mVs -1Condition under, calculating it unipolar is 210Fg than electric capacity -1
Embodiment 5
(1) 1.86mL aniline is dissolved in 25mLH 2SO 4Middle wiring solution-forming A, the 3.42g ammonium persulfate is dissolved in wiring solution-forming B in 50mL distilled water or the deionized water ([APS]/[AN]=1: 1); (2) solution A is changed in the reaction bulb, be added drop-wise to B in the reaction bulb under stirring, after dripping off, room temperature reaction 8h; (3) collect product in the reaction bulb, water, ethanol or acetone is washed product repeatedly, is neutral until cleaning solution; (4) product after will washing is in 50 ℃ of vacuumize 30h, the polyaniline that obtains mixing; (5) doped polyaniline is carried out dedoping with 5% ammonia spirit dipping 12h, the solid-to-liquid ratio of doped polyaniline and ammonia spirit is 0.01~10.Repeatedly reach 7.0 with distilled water or deionized water wash separation behind the dedoping, clean the intrinsic polyaniline that promptly obtains dedoping for 1~2 time with ethanol again until pH.(5) with the dedoping intrinsic polyaniline and the activator ZnCl that prepare 2Solution impregnation (intrinsic polyaniline and ZnCl 2Mass ratio be 1: 1), 105 ℃ of dryings promptly obtain ZnCl then 2The polyaniline precursor material of dipping; (6) with polyaniline precursor material under the Ar Buchholz protection, at 700 ℃ of carbonization constant temperature 1h; After naturally cooling to room temperature, with it at first at 1molL -1H 2SO 4Wash, in deionized water, clean to again till the pH value neutrality, promptly obtain the carbon-based material of the hetero-atom doping of activation.
Prepared material adopts LEO1525 type sem observation pattern as shown in Figure 5.As can beappreciated from fig. 5, prepared material is the particle of more homodisperse almost spherical, and granular size is below 1 μ m.

Claims (5)

1. the preparation method of an active carbon-based material is characterized in that:
Under the protection of inert gas, will mix or plain polyaniline polymer, make char-forming material at 500 ℃~1200 ℃ carbonization 1h~24h;
The quality of each element composition percentage composition is in the carbon-based material: carbon 50%~90%, oxygen 0.1%~35%, nitrogen 0.1%~35%, sulphur 0.0%~10%, phosphorus 0.0%~15%, boron 0.0%~15%;
It also comprises the solution activation processing step of char-forming material, and described solution activation is to be 0.1molL with char-forming material in concentration -1~10molL -1H 2SO 4, HNO 3, soak in one or more aqueous solution in the hydrochloric acid, potassium permanganate, hydrogen peroxide, ammonium persulfate, soaking temperature is 10 ℃~100 ℃, soak time is 30min~96h.
2. the preparation method of active carbon-based material according to claim 1 is characterized in that: described doping or plain polyaniline polymer be utilize aniline monomer, through chemical polymerization or electrochemical polymerization, the method synthesizing blender or the plain polyaniline polymer that adopt protonic acid doping or go to mix.
3. the preparation method of active carbon-based material according to claim 2, it is characterized in that: described electrochemical polymerization is meant following process:
1. aniline monomer and Bronsted acid are made into mixed electrolyte solutions, wherein the concentration of aniline is 0.01molL -1~3.0molL -1, Bronsted acid concentration be 0.1molL -1~5molL -1, aniline and Bronsted acid mol ratio be 0.05~5;
2. the electrode that adopted of aniline electrochemical polymerization comprises carbon electrode, lead and alloy electrode thereof, lead dioxide electrode, stainless steel electrode, nickel and alloy electrode thereof, titanium and alloy electrode thereof, conductive glass electrode or noble metal electrode; The shape of electrode comprises plate electrode, mesh electrode, stick electrode;
3. the constant potential polymerization is adopted in the electrochemical polymerization of aniline, and potential range is that 0.4V~3.0V, current density are 0.1Adm -2~10Adm -2, perhaps adopting electrokinetic potential scanning polymerization, potential range is that 0.4V~3.0V, electric potential scanning speed are 1mVs -1~300mVs -1, polymerization time is 10min~20h; Polymerization temperature is 5 ℃~50 ℃; The alr mode of electrolyte is gas agitation, mechanical agitation or does not stir;
4. after reaction finishes, product washing being separated several times, after filtrating is neutrality, is 50 ℃~100 ℃, normal pressure or vacuumize 2h~12h obtain the mixing polyaniline of attitude in temperature.
4. the preparation method of active carbon-based material according to claim 3, it is characterized in that: described Bronsted acid is H 2SO 4, HCl, HClO 4, HNO 3, H 3PO 4, H 3BO 3, CH 3In CHOOH, CHOOH, benzoic acid, p-methyl benzenesulfonic acid, citric acid, the oxalic acid one or more.
5. the preparation method of active carbon-based material according to claim 2; It is characterized in that: said method of going to mix is meant that the described polyaniline polymer of claim 3 carries out dedoping with ammonia spirit dipping 2h~36h of 1%~20%; The solid-to-liquid ratio of doped polyaniline and ammonia spirit is 0.01~10; Repeatedly reach 7.0 with distilled water or deionized water wash separation behind the dedoping, or promptly obtain plain polyaniline 1~2 time with the ethanol cleaning again until pH.
CN2010101235557A 2010-03-11 2010-03-11 Active carbon-based material and preparation method thereof Expired - Fee Related CN101800131B (en)

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