CN101774666A - 2-ethyl-anthraquinone modified gas diffusion electrode and preparation method thereof - Google Patents
2-ethyl-anthraquinone modified gas diffusion electrode and preparation method thereof Download PDFInfo
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- CN101774666A CN101774666A CN201010103376A CN201010103376A CN101774666A CN 101774666 A CN101774666 A CN 101774666A CN 201010103376 A CN201010103376 A CN 201010103376A CN 201010103376 A CN201010103376 A CN 201010103376A CN 101774666 A CN101774666 A CN 101774666A
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Abstract
The invention discloses a 2-ethyl-anthraquinone modified gas diffusion electrode which is composed of a gas diffusion layer and a catalyst layer, the gas diffusion layer is a mixture (2) of hydrophobic carbon cloth (1), graphitized Vulcan 72 carbon black and polytetrafluoroethylene coated on the hydrophobic carbon cloth, the catalyst layer (3) is a mixture of 2-ethyl-anthraquinone, Vulcan 72 carbon black and polytetrafluoroethylene coated on the diffusion layer mixture (2); the invention also discloses a preparation method of the above gas diffusion electrode, which is implemented by preparing hydrophobic carbon cloth, coating the mixture of graphitized Vulcan 72 carbon black and polytetrafluoroethylene on the hydrophobic carbon cloth, coating the mixture of 2-ethyl-anthraquinone, Vulcan 72 carbon black and polytetrafluoroethylene on the diffusion layer mixture (2), and heating. The invention can not cause secondary pollution to the environment, can is applicable to electrolyzation in organic waste water degradation industry.
Description
Technical field
The present invention relates to be applicable to gas diffusion electrode in the degradation of organic waste water and preparation method thereof, relate in particular to a kind of 2-ethyl-anthraquinone modified gas diffusion electrode and preparation method thereof, can be used for degrading waste water.
Background technology
Along with the kind and the quantity discharged of trade effluent are increasing, traditional method is difficult to reach the requirement of a series of organic wastewater degraded, and high-level oxidation technology becomes the focus of research.High-level oxidation technology comprises: wet air oxidation, supercritical water oxidation method, photochemistry and photocatalytic oxidation, sonochemistry oxidation style, electrochemical oxidation process, Fenton oxidation style.At present, a kind of electrochemical oxidation and Fenton oxidation bonded advanced oxidation processes become the prefered method of research organic wastewater degraded, because compared to other technology, such combination has advantages such as processing efficiency height, easy and simple to handle, environmental compatible.This Fenton oxidation style mainly is by generating a kind of strong oxidizer hydroxyl radical free radical (OH) degrading organic contaminant in wastewater, so the growing amount of OH has directly determined the degree of oxidation to Persistent organic pollutants.The electrolytics reaction formula that the Fenton method produces OH is: (under the acidic conditions) Fe
2++ H
2O
2+ H
+→ Fe
3++ OH+H
2O, (under the alkaline condition) Fe
2++ H
2O
2→ Fe
3++ OH+OH
-The electrolytics reaction formula that electrochemical oxidation process produces OH is: MOx[]+H
2O → MOx[OH]+H
++ e
-(MOx[] be anodic oxide molecule hole).In order further to improve the growing amount of OH, gas diffusion electrode is used in the Fenton oxidation style degradation of organic waste water, replace common Graphite Electrodes.Utilize oxygen that the gas-liquid-solid three-phase electrode reaction takes place on gas diffusion electrode, be reduced the generation hydrogen peroxide by 2 electronics processes, chemical equation is: (under the acidic conditions) O
2+ 2H
++ 2e
-→ H
2O
2, (under the alkaline condition) O
2+ H
2O+2e
-→ HO
2 -+ OH
-, HO
2 -+ H
2O → H
2O
2+ OH
-, promote the Fenton reaction to generate the ability of OH greatly, and hydrogen peroxide self also has certain oxidation capacity to organic pollutant.Gas diffusion electrode is by Catalytic Layer, diffusion layer, and collector three parts are formed, and comes Catalytic Layer when oxygen by diffusion layer and will issue angry liquid-solid three-phase electrode reaction in the effect of Catalytic Layer with the electrolytic solution by Catalytic Layer.Theoretically, generate excessive OH in the system and can make the degraded of organism exhaustive oxidation, permineralization is carbonic acid gas and water, can not cause second environmental pollution.Fenton oxidation style and electrochemical oxidation process degradation of organic waste water to industrial employing exists following problem at present:
1) transportation of hydrogen peroxide, inventory problem.Present industrial degrading waste water is that hydrogen peroxide and ferrous salt directly are added in the middle of the waste water system, the Fenton reaction takes place generate hydroxyl radical free radical, further oxidation of organic compounds.But because the stronger oxidisability of hydrogen peroxide, problems such as its transportation, storage have improved cost to a great extent.And the hydroperoxidation activity of long-term storage is affected, and the hydroperoxidation that generates immediately not as the scene is active high.
2) Jiang Xie efficiency.Because the key of degradable organic pollutant is to generate competent hydroxyl radical free radical, and the additional amount of depending merely in the electrochemical system that generates hydroxyl radical free radical of anodic oxidation is far from being enough.The efficient that generates hydroxyl radical free radical in the anodic oxidation is very low, and concentration is also very low, and can not thoroughly make mineralization of organic material is carbonic acid gas and water, also leaves intermediate product.
Summary of the invention
Main purpose of the present invention is at the problems referred to above, and what propose a kind of simple and efficient is applicable to 2-ethyl-anthraquinone modified gas diffusion electrode of degradation of organic waste water and preparation method thereof.
2-ethyl-anthraquinone modified gas diffusion electrode provided by the present invention is formed (see figure 2) by gas diffusion layers and Catalytic Layer, described gas diffusion layers (forming by 1 and 2) is for hydrophobicity carbon cloth (1) and be coated in greying Vulcan 72 carbon blacks on the hydrophobicity carbon cloth and the blend (2) of tetrafluoroethylene, wherein, the mass ratio of greying Vulcan 72 carbon blacks and tetrafluoroethylene is 1.5～4: 1, and the hydrophobicity carbon cloth also plays the effect of collector and supporter; Described Catalytic Layer (3) is for being coated to 2-ethyl-anthraquinone, Vulcan72 carbon black and the polytetrafluoroethylblended blended thing (3) on the diffusion layer blend (2), the mass ratio of Vulcan 72 carbon blacks and tetrafluoroethylene is 1.5～4: 1, and the quality of 2-ethyl-anthraquinone is 10～40% with respect to the ratio of Vulcan 72 carbon blacks and tetrafluoroethylene total mass.
The preparation method of 2-ethyl-anthraquinone modified gas diffusion electrode of the present invention sees Fig. 1, may further comprise the steps:
1) carbon cloth is soaked put 5～10s in 5% ptfe emulsion, 80 ℃ of weighings behind oven dry 10～30min down, carbon cloth weightening finish 5～10%, 360 ℃ of calcining 3～5min down in retort furnace obtain the hydrophobicity carbon cloth 1 as collector and supporter then;
2) Vulcan 72 carbon blacks are handled 2h at 2800 ℃ of following high temperature graphitizations and obtain greying Vulcan 72 carbon blacks.Greying Vulcan 72 carbon blacks are dissolved in the Virahol, then add ptfe emulsion (massfraction is 60%), the mass ratio of graphitized carbon black and Virahol is 0.009～0.015: 1, the mass ratio of graphitized carbon black and ptfe emulsion is 0.9～2.4: 1, spread upon after stirring on the hydrophobicity carbon cloth (1), the carbon black amount that makes the above-mentioned mixed solution that applies on the unit surface carbon cloth is 0.0075～0.01g/cm
2, 80 ℃ of down dry 1～3h, in retort furnace 360 ℃ down behind calcining 3～5min, the 30～120s that colds pressing under 0.7～2.1MPa room temperature obtains gas diffusion layers;
3) with the mixing solutions of Virahol and deionized water as dispersion agent, the volume ratio of Virahol and deionized water is 1: 4～6; Organic catalyst 2-ethyl-anthraquinone and Vulcan 72 carbon blacks are dissolved in the mixing solutions of Virahol and deionized water, then add massfraction and be 60% ptfe emulsion, the mass ratio of the mixing solutions of Vulcan 72 carbon blacks and Virahol and deionized water is 0.0072～0.0120: 1, the mass ratio of Vulcan 72 carbon blacks and ptfe emulsion is 0.9～2.4: 1, the quality of 2-ethyl-anthraquinone is 10～40% with respect to the ratio of Vulcan 72 carbon blacks and tetrafluoroethylene total mass, spread upon after stirring on gas diffusion layers carbon black (2) one sides, the carbon content that makes the above-mentioned mixed solution that applies on the unit surface carbon cloth is 0.0075～0.01g/cm2,110 ℃ of down dry 10～24h, make the crystallization of catalyzer liquefied heavy, on thermocompressor in 0.7～2.1MPa, suppress 30～120s down for 110 ℃, again in 0.7～2.1MPa, suppress 30～120s down for 310 ℃, make catalyzer gasification recrystallization, obtain gas diffusion electrode.
At first, improve the production rate of hydrogen peroxide on gas diffusion electrode by catalyzer, keep certain density hydrogen peroxide under the situation of oxygen sustainable supply, making has enough hydrogen peroxide in the organic process in the degrading waste water, and this has just been avoided the problem of hydrogen peroxide transportation, storage.Secondly, when the adding of 2-ethyl-anthraquinone catalyzer improved yields of hydrogen peroxide greatly, this hydroperoxidation activity that generates immediately in degradation process was higher, more helps thorough degradation of organic substances.
The present invention has following beneficial effect:
The present invention is modulated into pulpous state by Vulcan 72 carbon blacks, Virahol and the ptfe emulsion with graphitization processing, spreads upon on the hydrophobicity carbon cloth as gas diffusion layers, and the hydrophobicity carbon cloth is also as collector simultaneously; Then apply Catalytic Layer on carbon black one side of gas diffusion layers, Catalytic Layer is the slurry that 2-ethyl-anthraquinone, Vulcan 72 carbon blacks, ptfe emulsion, Virahol and deionized water mixing solutions are modulated into.By hydrophobicity enhanced principle after the carbon black greying, reached of the requirement of the different integral parts of gas diffusion electrode to the carbon black hydrophilic and hydrophobic, help phase reaction, the hydrophobic gas diffusion layers of having relatively high expectations uses graphited Vulcan 72 carbon blacks, uses common Vulcan 72 carbon blacks and require low hydrophobicity to get Catalytic Layer; The hydrophobicity that helps improving electrode with tetrafluoroethylene as the binding agent of gas diffusion layers and Catalytic Layer; With the hydrophobicity carbon cloth as supporter and collector help gas diffusion electrode in acid, alkaline waste water solidity to corrosion and the raising of electroconductibility; As catalyzer, by twice recrystallization of catalyzer in the electrode production process, make the 2-ethyl-anthraquinone particle at Catalytic Layer surface homodisperse (as shown in Figure 3) with 2-ethyl-anthraquinone, the 2-ethyl-anthraquinone recrystallization particle helps oxygen that 2e takes place
-Reaction directly generates hydrogen peroxide, and 4e does not take place
-Reaction generates OH
-For the Fenton reaction is supplied raw materials, thereby the concentration that has improved hydroxyl radical free radical greatly improves the degradation rate of organic pollutant, and the hydrogen peroxide of this instant generation has higher reactive behavior, simultaneously, the special construction of 2-ethyl-anthraquinone catalyzer makes it possess the characteristic of automatic oxidation reduction, can be under oxygen and hydrionic effect automatic betatopic, carry out the spontaneous reversible transition (as shown in Figure 6) between 2-ethyl-anthraquinone and 2-ethyl anthracene quinhydrones, reaction mechanism is: 2-ethyl-anthraquinone gets electronics and generates 2-ethyl anthracene quinhydrones, 2-ethyl anthracene quinhydrones and oxygen reaction generate negative oxygen ion, negative oxygen ion reacts with water again, generate the intermediate product hydrogen peroxide, this has improved the output of hydrogen peroxide again from another aspect
The reduction reaction of 2 electronics processes can both catalytic oxygen in the pH of certain limit (1-14) value takes place in gas diffusion electrode of the present invention, generates hydrogen peroxide.
Therefore, 2-ethyl-anthraquinone modified gas diffusion electrode preparation method provided by the present invention and process are simple, compare with electrochemical oxidation process with the Fenton oxidation style of industrial water treatment applications, the transportation and the inventory problem of hydrogen peroxide have been solved, in acidity, solidity to corrosion and good conductivity in the alkalescence organic waste water, and the concentration that catalytic and automatic oxidation reduction by the 2-ethyl-anthraquinone catalyzer have improved hydroxyl radical free radical, thereby can make the degraded of organism exhaustive oxidation, permineralization is carbonic acid gas and water, can not cause, be applicable to the electrolytic reaction in the organic wastewater degraded industry second environmental pollution.
Description of drawings
Fig. 1 is preparation flow figure of the present invention
Fig. 2 is a structural representation of the present invention
The 1st, hydrophobicity carbon cloth (collector and supporter),
The 2nd, graphitized carbon black and tetrafluoroethylene mixed coating, 1 and 2 form gaseous diffusion
The 3rd, Catalytic Layer
The electron scanning micrograph of the gas diffusion electrode that Fig. 3 prepares for embodiment 1
The cyclic voltammogram of the gas diffusion electrode that Fig. 4 prepares for embodiment 1
Fig. 5 is gas diffusion electrode be used to the to degrade degradation rate and the phenol charge capacity graph of a relation of wastewater containing phenol
1 is common carbon black/tetrafluoroethylene gas diffusion electrode Pyrogentisinic Acid's degradation rate
2 is the gas diffusion electrode Pyrogentisinic Acid's of embodiment 1 degradation rate
3 is the gas diffusion electrode Pyrogentisinic Acid's of embodiment 2 degradation rate
4 is the gas diffusion electrode Pyrogentisinic Acid's of embodiment 3 degradation rate
5 is the gas diffusion electrode Pyrogentisinic Acid's of embodiment 4 degradation rate
Fig. 6 is gas diffusion electrode catalyzer 2-ethyl-anthraquinone generates hydrogen peroxide by automatic oxidation reduction a synoptic diagram
Embodiment:
1) carbon cloth of a 6cm*6cm is soaked puts 5s in 5% ptfe emulsion, weighing behind oven dry 10min under 80 ℃, 3min is calcined in carbon cloth weightening finish 5% then under 360 ℃ in retort furnace, obtain the hydrophobicity carbon cloth, obtain hydrophobicity carbon cloth as collector and supporter;
2) Vulcan 72 carbon blacks are handled 2h at 2800 ℃ of following high temperature graphitizations and obtain greying Vulcan 72 carbon blacks; Taking by weighing 0.36g greying Vulcan 72 carbon blacks is dissolved in the Virahol (24g) of 30ml, add the 0.1ml mass fraction again and be after 60% ptfe emulsion (0.15g) stirs, spread upon on the hydrophobicity carbon cloth of 6cm*6cm, behind 80 ℃ of following dry 1h, after in retort furnace, calcining 3min under 360 ℃, under 0.7MPa and room temperature, suppressing 30s on the thermocompressor, obtain gas diffusion layers.
3) with the mixing solutions of Virahol and deionized water as dispersion agent, the volume ratio of Virahol and deionized water is 1: 4,0.045g 2-ethyl-anthraquinone and 0.36g Vulcan 72 carbon blacks are dissolved in the Virahol of 31.25ml and the mixing solutions of deionized water (30g), add the 0.1ml mass fraction again and be after 60% ptfe emulsion (0.15g) stirs, spread upon on gas diffusion layers carbon black one side, dry 10h under 110 ℃, make the crystallization of catalyzer liquefied heavy, on thermocompressor in 0.7MPa, suppress 30s down for 110 ℃, again in 0.7MPa, suppress 30s down for 310 ℃, make catalyzer gasification recrystallization, obtain gas diffusion electrode.
The electron scanning micrograph of the gas diffusion electrode that it obtains is seen Fig. 3, can see by Fig. 3, and 2-ethyl-anthraquinone recrystallize uniform particles is distributed in carbon material surface; The cyclic voltammogram of the gas diffusion electrode that it obtains is seen Fig. 4, electrolytic solution is 0.5M NaOH, temperature is 25 ℃, scanning speed is 100mV/s, as we can see from the figure, two tangible oxygen reduction peaks occur at electrode in alkali lye, show that the 2e reduction reaction takes place oxygen, intermediate product is a hydrogen peroxide;
1) carbon cloth of a 6cm*6cm is soaked put 5s in 5% ptfe emulsion, 80 ℃ of weighings behind the oven dry 20min down, carbon cloth weightening finish 8%, 360 ℃ of calcining 4min down in retort furnace obtain the hydrophobicity carbon cloth as collector and supporter then.
2) Vulcan 72 carbon blacks are handled 2h at 2800 ℃ of following high temperature graphitizations and obtain greying Vulcan 72 carbon blacks.Taking by weighing 0.315g greying Vulcan 72 carbon blacks is dissolved in the Virahol (32g) of 40ml, add the 0.18ml mass fraction again and be after 60% ptfe emulsion (0.225g) stirs, spread upon on the hydrophobicity carbon cloth of 6cm*6cm, behind 80 ℃ of following dry 2h, after in retort furnace, calcining 4min under 360 ℃, under 1.4MPa and room temperature, suppressing 60s on the thermocompressor, obtain gas diffusion layers.
3) with the mixing solutions of Virahol and deionized water as dispersion agent, the volume ratio of Virahol and deionized water is 1: 5.0.09g 2-ethyl-anthraquinone and 0.315g Vulcan 72 carbon blacks are dissolved in the Virahol of 41.23ml and the mixing solutions of deionized water (40g), add the 0.18ml mass fraction again and be after 60% ptfe emulsion (0.225g) stirs, spread upon on gas diffusion layers carbon black one side, dry 17h under 110 ℃, make the crystallization of catalyzer liquefied heavy, on thermocompressor in 1.4MPa, 110 ℃ compacting 60s down, again in 1.4MPa, 310 ℃ of following compacting 60s, make catalyzer gasification recrystallization, obtain gas diffusion electrode.
1) carbon cloth of a 6cm*6cm is soaked put 5s in 5% ptfe emulsion, 80 ℃ of weighings behind the oven dry 20min down, carbon cloth weightening finish 8%, 360 ℃ of calcining 4min down in retort furnace obtain the hydrophobicity carbon cloth as collector and supporter then.
2) Vulcan 72 carbon blacks are handled 2h at 2800 ℃ of following high temperature graphitizations and obtain greying Vulcan 72 carbon blacks, taking by weighing 0.315g greying Vulcan 72 carbon blacks is dissolved in the Virahol (32g) of 40ml, add the 0.18ml mass fraction again and be after 60% ptfe emulsion (0.225g) stirs, spread upon on the hydrophobicity carbon cloth of 6cm*6cm, behind 80 ℃ of following dry 2h, after in retort furnace, calcining 4min under 360 ℃, under 1.4MPa and room temperature, suppressing 60s on the thermocompressor, obtain gas diffusion layers.
3) with the mixing solutions of Virahol and deionized water as dispersion agent, the volume ratio of Virahol and deionized water is 1: 5,0.135g 2-ethyl-anthraquinone (quality of 2-ethyl-anthraquinone is 30% with respect to the ratio of Vulcan 72 carbon blacks and tetrafluoroethylene total mass) and 0.315g Vulcan 72 carbon blacks are dissolved in the Virahol of 41.23ml and the mixing solutions of deionized water (40g), add the 0.18ml mass fraction again and be after 60% ptfe emulsion (0.225g) stirs, spread upon on gas diffusion layers carbon black one side, dry 17h under 110 ℃, make the crystallization of catalyzer liquefied heavy, on thermocompressor in 1.4MPa, suppress 60s down for 110 ℃, again in 1.4MPa, suppress 60s down for 310 ℃, make catalyzer gasification recrystallization, obtain gas diffusion electrode.
Embodiment 4
1) carbon cloth of a 6cm*6cm is soaked put 5s in 5% ptfe emulsion, 80 ℃ of weighings behind the oven dry 30min down, carbon cloth weightening finish 10%, 360 ℃ of calcining 5min down in retort furnace obtain the hydrophobicity carbon cloth as collector and supporter then.
2) Vulcan 72 carbon blacks are handled 2h at 2800 ℃ of following high temperature graphitizations and obtain greying Vulcan 72 carbon blacks.Taking by weighing 0.27g greying Vulcan 72 carbon blacks is dissolved in the Virahol (40g) of 50ml, add the 0.24ml mass fraction again and be after 60% ptfe emulsion (0.3g) stirs, spread upon on the hydrophobicity carbon cloth of 6cm*6cm, behind 80 ℃ of following dry 3h, after in retort furnace, calcining 5min under 360 ℃, under 2.1MPa and room temperature, suppressing 120s on the thermocompressor, obtain gas diffusion layers.
3) with the mixing solutions of Virahol and deionized water as dispersion agent, the volume ratio of Virahol and deionized water is 1: 6.0.18g 2-ethyl-anthraquinone and 0.27g Vulcan 72 carbon blacks are dissolved in the Virahol (50g) of 51.50ml, add the 0.24ml mass fraction again and be after 60% ptfe emulsion (0.3g) stirs, spread upon on gas diffusion layers carbon black one side, dry 24h under 110 ℃, make the crystallization of catalyzer liquefied heavy, on thermocompressor in 2.1MPa, 110 ℃ compacting 120s down, again in 2.1MPa, 310 ℃ compacting 120s down, make catalyzer gasification recrystallization, obtain gas diffusion electrode.
The degradation rate of electrode pair phenol under equal conditions carries out among Fig. 5,1 is 1 degradation rate for common carbon black/tetrafluoroethylene gas diffusion electrode Pyrogentisinic Acid among the figure, 2 for the quality of 2-ethyl-anthraquinone among the embodiment 1 be 10% gas diffusion electrode Pyrogentisinic Acid's degradation rate with respect to the ratio of Vulcan 72 carbon blacks and tetrafluoroethylene total mass, 3 for the quality of 2-ethyl-anthraquinone among the embodiment 2 be 20% gas diffusion electrode Pyrogentisinic Acid's degradation rate with respect to the ratio of Vulcan 72 carbon blacks and tetrafluoroethylene total mass, 4 for the quality of 2-ethyl-anthraquinone among the embodiment 3 be 30% gas diffusion electrode Pyrogentisinic Acid's degradation rate with respect to the ratio of Vulcan 72 carbon blacks and tetrafluoroethylene total mass, 5 for the quality of 2-ethyl-anthraquinone among the embodiment 4 be 40% gas diffusion electrode Pyrogentisinic Acid's degradation rate with respect to the ratio of Vulcan72 carbon black and tetrafluoroethylene total mass, comparison by this figure can be found, 2-ethyl-anthraquinone modified gas diffusion electrode Pyrogentisinic Acid's degradation rate is than common carbon black/tetrafluoroethylene gas diffusion electrode Pyrogentisinic Acid's degradation rate height, and the degradation rate of phenol improves along with the increase of 2-ethyl-anthraquinone amount.
Claims (2)
1. 2-ethyl-anthraquinone modified gas diffusion electrode, it is characterized in that, this electrode is made up of gas diffusion layers and Catalytic Layer, described gas diffusion layers is hydrophobicity carbon cloth (1) and is coated in greying Vulcan 72 carbon blacks on the hydrophobicity carbon cloth and the blend (2) of tetrafluoroethylene, wherein, the mass ratio of greying Vulcan 72 carbon blacks and tetrafluoroethylene is 1.5～4: 1, and the hydrophobicity carbon cloth plays the effect of collector and supporter; Described Catalytic Layer (3) is for being coated to 2-ethyl-anthraquinone, Vulcan 72 carbon blacks and the polytetrafluoroethylblended blended thing (3) on the diffusion layer blend (2), the mass ratio of Vulcan 72 carbon blacks and tetrafluoroethylene is 1.5～4: 1, and the quality of 2-ethyl-anthraquinone is 10～40% with respect to the ratio of Vulcan 72 carbon blacks and tetrafluoroethylene total mass.
2. according to the preparation method of the 2-ethyl-anthraquinone modified gas diffusion electrode of claim 1, it is characterized in that, may further comprise the steps:
1) carbon cloth is soaked put 5～10s in 5% ptfe emulsion, 80 ℃ of weighings behind oven dry 10～30min down, carbon cloth weightening finish 5～10%, 360 ℃ of calcining 3～5min down in retort furnace obtain the hydrophobicity carbon cloth as collector and supporter then;
2) Vulcan 72 carbon blacks are handled 2h at 2800 ℃ of following high temperature graphitizations and obtain greying Vulcan 72 carbon blacks.Greying Vulcan 72 carbon blacks are dissolved in the Virahol, then add massfraction and be 60% ptfe emulsion, the mass ratio of graphitized carbon black and Virahol is 0.009～0.015: 1, the mass ratio of graphitized carbon black and ptfe emulsion is 0.9～2.4: 1, spread upon after stirring on the hydrophobicity carbon cloth, the carbon black amount that makes the above-mentioned mixed solution that applies on the unit surface carbon cloth is 0.0075～0.01g/cm
2, 80 ℃ of down dry 1～3h, in retort furnace 360 ℃ down behind calcining 3～5min, the 30～120s that colds pressing under 0.7～2.1MPa room temperature obtains gas diffusion layers;
3) with the mixing solutions of Virahol and deionized water as dispersion agent, the volume ratio of Virahol and deionized water is 1: 4～6; Organic catalyst 2-ethyl-anthraquinone and Vulcan 72 carbon blacks are dissolved in the mixing solutions of Virahol and deionized water, then add massfraction and be 60% ptfe emulsion, the mass ratio of the mixing solutions of Vulcan 72 carbon blacks and Virahol and deionized water is 0.0072～0.0120: 1, the mass ratio of Vulcan 72 carbon blacks and ptfe emulsion is 0.9～2.4: 1, the quality of 2-ethyl-anthraquinone is 10～40% with respect to the ratio of Vulcan 72 carbon blacks and tetrafluoroethylene total mass, spread upon after stirring on gas diffusion layers carbon black one side, the carbon content that makes the above-mentioned mixed solution that applies on the unit surface carbon cloth is 0.0075～0.01g/cm2,110 ℃ of down dry 10～24h, make the crystallization of catalyzer liquefied heavy, on thermocompressor in 0.7～2.1MPa, suppress 30～120s down for 110 ℃, again in 0.7～2.1MPa, suppress 30～120s down for 310 ℃, make catalyzer gasification recrystallization, obtain gas diffusion electrode.
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| CN104659379A (en) * | 2015-02-13 | 2015-05-27 | 清华大学 | Nanometer iron-manganese composite oxide loaded gas diffusion electrode and preparation and application thereof |
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| CN113604822A (en) * | 2021-08-12 | 2021-11-05 | 浙江工商大学 | Carbon/anthraquinone composite material, preparation method thereof and application thereof in hydrogen peroxide synthesis |
| CN114703496A (en) * | 2022-04-12 | 2022-07-05 | 中国科学院生态环境研究中心 | Air electrode and preparation method thereof |
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