CN111261883A - Preparation method and application of ionic liquid functionalized graphene oxide loaded nano cobaltosic oxide composite material - Google Patents
Preparation method and application of ionic liquid functionalized graphene oxide loaded nano cobaltosic oxide composite material Download PDFInfo
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Abstract
The invention relates to a preparation method and application of an ionic liquid functionalized graphene oxide loaded nanometer cobaltosic oxide composite material. The method comprises the following steps: carrying out reflux reaction on ionic liquid 1-butyl-3-aminopropylimidazole bistrifluoromethane sulfimide salt and graphene oxide deionized water to obtain a product, namely ionic liquid functionalized graphene oxide; and then mixing the ionic liquid functionalized graphene oxide, an oxidant and an alkali solution of a divalent cobalt salt for reaction to obtain a black solid product, namely the ionic liquid functionalized graphene oxide loaded cobaltosic oxide nano particle composite material. The invention is a novel composite electro-catalytic material with good oxygen reduction performance, and can realize the preparation of the carbon-based oxygen reduction catalytic material with high efficiency, high quality and high current density.
Description
Technical Field
The invention relates to the technical field of ionic liquid and electrocatalysis, in particular to an electrocatalyst, a preparation method thereof and application thereof in electrocatalytic oxygen reduction.
Background
In recent years, with the development of economic science and technology and industry in the world, the demand of people for energy is continuously increased, but the world energy crisis is increased rapidly by the over-exploitation and utilization of fossil energy, and the environment is greatly damaged, so that people urgently need to find renewable and sustainable convertible clean energy to replace the traditional fossil fuel. Among various energy conversion and storage methods, the electrochemical water decomposition technology is very promising, and can be used in novel clean electrochemical energy sources such as fuel cells, metal-air cells and the like, but the novel clean electrochemical energy sources such as the fuel cells, the metal-air cells and the like have the problems of slow oxygen reduction (ORR) process, low durability, high cost and the like, and the search for a high-efficiency, stable and low-cost catalytic material is urgent. The alkaline electrolytic water system material has wide sources and does not depend on noble metals, and the service life of the catalytic device is relatively longer, so that the large-scale application of the catalytic device in the future is expected to be realized.
At present, the ORR reaction mainly depends on platinum-based noble metal catalysts and the like, and although the ORR efficiency of the noble metal catalysts is high, the noble metal catalysts are high in cost, small in reserve and poor in stability, so that large-scale production is difficult to realize. In recent years, non-noble metal catalysts are widely researched, and the loading of non-noble metals such as metal oxides of Fe, Co, Ni and the like can effectively enhance the catalytic effect, wherein Co has the advantages of good ORR performance, high stability and the like, but the non-noble metals exist in the catalysts in the form of oxides, have the defects of easy agglomeration, large particle size, poor conductivity and the like, and cause poor ORR performance. Graphene oxide is often used in electrochemistry due to its large specific surface area, large amount of active functional groups on the surface and excellent conductivity, is easily modified and functionalized, and is also a good substrate. Non-noble metal oxide can be loaded on the surface of graphene oxide, and the defects of non-noble metal can be effectively overcome. In order to improve the conductivity of the non-noble metal oxide and reduce the agglomeration, some additives and surfactants for increasing the conductivity are generally introduced, but the physical mixture has the defects of easy dissociation, low conductivity efficiency, small contact area with the catalyst and the like. The ionic liquid has the characteristics of high conductivity, good stability, wide electrochemical window and the like, and is widely applied to electrochemistry. In order to further improve the conductivity of the common electrode, a certain amount of ionic liquid can be physically mixed, and because the ionic liquid is dissociated in the electrode material, the contact area between the ionic liquid and the catalytic material is reduced due to the defect that the ionic liquid is high in viscosity and easy to absorb water, the ionic liquid is not easy to form a film, the stability and the catalytic effect of the electrode are reduced, and certain limitations are realized.
Disclosure of Invention
The invention aims to provide a preparation method and application of an ionic liquid functionalized graphene oxide loaded cobaltosic oxide nanoparticle composite material, aiming at the defects in the prior art. According to the method, the 1-butyl-3-aminopropylimidazole bis (trifluoromethane) sulfonyl imide salt is subjected to functional modification on the surface of graphene oxide to be fixed on the surface of the graphene oxide, and the catalytic performance is improved by utilizing the coupling property of an ionic liquid imidazole ring and cobaltosic oxide. The invention is a novel composite electro-catalytic material with good oxygen reduction performance, and can realize the preparation of the carbon-based oxygen reduction catalytic material with high efficiency, high quality and high current density.
The technical scheme of the invention is as follows:
a preparation method of an ionic liquid functionalized graphene oxide loaded cobaltosic oxide nanoparticle composite material is characterized by comprising the following steps:
(1) performing ultrasonic dispersion on ionic liquid 1-butyl-3-aminopropylimidazole bistrifluoromethane sulfimide salt and graphene oxide deionized water for 10-60 min, performing magnetic stirring under the protection of nitrogen gas, and performing constant-temperature reflux for 24-36 h at 25-50 ℃ to obtain a product of ionic liquid functionalized graphene oxide;
wherein the mass ratio of the ionic liquid to the graphene oxide is 1: 0.6-1: 0.3; adding 30-50 mL of deionized water into every 1-5 g of ionic liquid;
(2) mixing the ionic liquid functionalized graphene oxide obtained in the previous step, an oxidant and an alkali solution of a divalent cobalt salt, adding the mixture into a reaction kettle with a polytetrafluoroethylene lining, and keeping the temperature at 80-160 ℃ for 8-24 hours to obtain a black solid product, namely, an ionic liquid functionalized graphene oxide loaded cobaltosic oxide nanoparticle composite material;
wherein the mass ratio of the ionic liquid functionalized graphene oxide to the divalent cobalt salt to the oxidant is 1: 10-30;
the divalent cobalt salt is cobalt chloride hexahydrate or cobalt nitrate hexahydrate; the alkali solution is obtained from 20-30% of sodium hydroxide solution or 20-30% of ammonia water; every 20-30 mL of alkali solution contains 1-50 g of divalent cobalt salt;
the oxidant can be sodium persulfate, hydrogen peroxide, sodium nitrate or sodium nitrite;
the preparation method of the ionic liquid comprises the following steps:
(1) dissolving 1-butylimidazole and 3-chloropropylamine hydrochloride in a solvent, and carrying out constant-temperature magnetic stirring reflux for 10-36 h at the temperature of 50-90 ℃ in the atmosphere of nitrogen protection to obtain a yellow liquid product, namely 1-butyl-3-aminopropylimidazole chloride;
wherein the mass ratio of 1-butylimidazole: 3-chloropropylamine hydrochloride is 1: 1.2-1: 1.8; adding 1-butyl imidazole 5-10 g per 10-60 mL of solvent; the solvent can be deionized water, absolute ethyl alcohol and acetonitrile;
(2) mixing the light yellow product obtained in the step (1) with lithium bistrifluoromethanesulfonylimide (LITFSI), dissolving in deionized water, and magnetically stirring at a constant temperature of 25-50 ℃ for 5-24 hours under the protection of nitrogen to obtain an amination ionic liquid 1-butyl-3-aminopropylimidazole bistrifluoromethanesulfonylimide salt;
wherein the mass ratio is that a light yellow product: and (3) LITFSI is 1: 1.5-1: 2; adding 2.5-5 g of light yellow product into every 30-50 mL of deionized water;
the ionic liquid functionalized graphene oxide loaded cobaltosic oxide nanoparticle composite material is used as an oxygen reduction electrocatalytic electrode cathode material.
The invention has the substantive characteristics that:
the traditional physical mixing addition is changed, the ionic liquid is ingeniously fixed on the graphene oxide substrate in a certain chemical mode, and the defects of the application of the ionic liquid are overcome. The amino functionalized ionic liquid modified graphene oxide enhances the conductivity and the electron transfer rate, and meanwhile, the ionic liquid and the loaded cobaltosic oxide nanoparticles form a synergistic effect, so that the electrocatalytic activity is further improved.
The ionic liquid functionalized graphene oxide loaded cobaltosic oxide nanoparticle composite material synthesizes 1-butyl-3-aminopropylimidazole bistrifluoromethanesulfonylimide salt ([ NH2-C3bim ] [ TFSI ]) ionic liquid, cations have good conductivity and stability under an alkaline condition, and anion bistrifluoromethanesulfonylimide (TFSI) has good conductivity, stability and a high electrochemical window; the surface of the graphene oxide is provided with a large number of functional groups such as carboxyl, hydroxyl and the like, the ionic liquid is modified on the surface of the graphene oxide, and compared with the traditional physical additive, the ionic liquid fixed on the surface of the graphene oxide forms a plurality of electron-donating groups such as acyl and the like, so that the electron transfer rate and the catalytic activity are improved, and the conductivity and the contact area with a catalyst are improved; then loading cobaltosic oxide nanoparticles onto the ionic liquid functionalized graphene oxide; co has certain oxygen reduction performance as a catalytic active center, ionic liquid on the surface of graphene oxide can form a synergistic effect with cobaltosic oxide, so that the adsorption capacity on oxygen is improved, O-bond fracture is accelerated, intermediates in a catalytic process are protected, the energy required by reaction is reduced, the oxygen reduction catalytic performance is greatly enhanced, and the conductivity and electrochemical window of a catalytic material are further increased. Through electrochemical performance tests, the synthesized novel electro-catalytic material has good conductivity and electro-catalytic performance.
In the preparation process of the composite material, 1-butylimidazole and 3-chloropropylamine hydrochloride are connected to obtain 1-butyl-3-aminopropylimidazole chloride salt, the 1-butyl-3-aminopropylimidazole chloride salt is subjected to multiple times of rotary evaporation and washing, then subjected to ion exchange with lithium bistrifluoromethanesulfonylimide (LiTFSI), filtered and washed to obtain aminated ionic liquid 1-butyl-3-aminopropylimidazole bistrifluoromethanesulfonylimide salt, then the prepared ionic liquid is mixed with graphene oxide to react to obtain ionic liquid functionalized graphene oxide, finally, cobaltosic oxide nanoparticles are loaded on the ionic liquid functionalized graphene oxide, and the ionic liquid functionalized graphene oxide loaded cobaltosic oxide nanoparticle composite material is obtained through multiple times of washing and filtering. The preparation process is simple, the raw materials are easy to obtain, the reaction is controllable, the product yield is high, the method is suitable for industrial production, and the prepared ionic liquid functionalized graphene oxide loaded cobaltosic oxide nanoparticle composite material has excellent electrocatalytic oxygen reduction performance and is suitable for the field of electrocatalysis.
The invention has the beneficial effects that:
the ionic liquid functionalized graphene oxide loaded cobaltosic oxide nanoparticle composite material prepared by the invention has the advantages of simple preparation method, easily available raw materials, low cost, controllable reaction and suitability for industrial production, and the prepared electro-catalytic material has good electro-catalytic oxygen reduction performance, high conductivity and wide electrochemical window and is suitable for the field of electro-catalysis. The concrete expression is as follows:
the composite material overcomes the defects of easy agglomeration, large particle size and poor catalytic effect of the cobaltosic oxide, and the cobaltosic oxide of the composite material is uniformly distributed on the graphene oxide, has small (8-15nm) particle size and is uniform, thereby improving the catalytic activity.
The amino functionalized ionic liquid is innovatively introduced into the catalytic material, besides the excellent conductivity of the ionic liquid, the amino functionalized ionic liquid can react with a large number of functional groups such as carboxyl and hydroxyl on the surface of graphene oxide, the functionalized ionic liquid is fixed on the surface of the graphene oxide to form electron-donating groups such as acyl groups, the electron-donating groups are not easy to dissociate, the electron transfer rate in the catalytic process is accelerated, meanwhile, cobaltosic oxide and imidazole ionic liquid have a synergistic effect, the activity of a catalytic process intermediate is improved, the adsorption effect of cobaltosic oxide on oxygen is increased, the O-bond fracture is accelerated, and the oxygen reduction catalytic performance is greatly improved.
The catalytic material has good electrocatalytic oxygen reduction performance, the initial potential and the half-wave potential of the catalytic material are respectively 0.84V and 0.71V, the initial potential and the half-wave potential are close to 0.95V and 0.81V of a commercial platinum-carbon catalyst, and the catalytic material has higher limiting density current.
Drawings
FIG. 1 is an infrared spectrum of 1-butyl-3-aminopropylimidazole bistrifluoromethanesulfonylimide chloride obtained in example 1.
Fig. 2 is a transmission electron micrograph of the ionic liquid functionalized graphene oxide supported cobaltosic oxide nanoparticle composite material obtained in example 1.
FIG. 3 is a linear voltammetry scan curve (sweep rate is 10mV/s, and rotation speed is 1600rpm) of the ionic liquid functionalized graphene oxide supported cobaltosic oxide nanoparticle composite material and the platinum-carbon catalyst obtained in example 1 in 0.1mol/L oxygen saturated KOH solution.
Detailed Description
The preparation of the ionic liquid functionalized graphene oxide-supported cobaltosic oxide nanoparticle composite material and the application thereof in electrocatalytic oxygen reduction are further described by specific examples below.
Example 1
(1) Dissolving 10g of 1-butylimidazole and 12g of 3-chloropropylamine hydrochloride in 20mL of absolute ethyl alcohol, carrying out magnetic stirring reflux for 10 hours at the temperature of 80 ℃ to obtain light yellow liquid, washing the obtained liquid for multiple times by using the absolute ethyl alcohol, carrying out rotary evaporation, and finally drying in a vacuum drying oven at the temperature of 60 ℃ for 10 hours to obtain a light yellow viscous liquid product, namely 1-butyl-3-aminopropylimidazole chloride, wherein the structural formula is as follows:
(2) and (2) mixing 5g of 1-butyl-3-aminopropylimidazole chloride salt obtained in the step (1) with 7.5g of lithium bistrifluoromethanesulfonylimide (LITFSI), dissolving in 30mL of deionized water, magnetically stirring at a constant temperature of 30 ℃ for 5 hours under the protection of nitrogen, and performing rotary evaporation to obtain the product 1-butyl-3-aminopropylimidazole bistrifluoromethanesulfonylimide salt.
The structural formula is as follows:
(3) and (3) mixing 1.8g of graphene oxide in 30mL of deionized water, performing ultrasonic dispersion for 10min to obtain a graphene oxide dispersion solution, dissolving 3g of 1-butyl-3-aminopropylimidazole bistrifluoromethane sulfimide salt obtained in the step (2) in 30mL of graphene oxide dispersion solution, performing magnetic stirring under the protection of nitrogen gas, refluxing at a constant temperature of 50 ℃ for 24h, and performing suction filtration to obtain the product of ionic liquid functionalized graphene oxide.
(4) And (3) dissolving 30g of divalent cobalt salt in 20mL of sodium hydroxide solution with the mass fraction of 30% to prepare a divalent cobalt salt alkali solution, dissolving 3g of ionic liquid functionalized graphene oxide obtained in the step (3) and 30g of sodium nitrate in the obtained 20mL of divalent cobalt salt alkali solution, transferring the solution to a reaction kettle with a polytetrafluoroethylene lining, reacting at a constant temperature of 80 ℃ for 8 hours, and performing suction filtration to obtain a black solid product, namely the ionic liquid functionalized graphene oxide supported cobaltosic oxide nanoparticle composite material.
(5) And (3) performance testing: 5mg of ionic liquid functionalized graphene oxide-supported cobaltosic oxide nanoparticle composite catalyst is weighed and added into 1ml of 0.2% perfluorosulfonic acid polymer solution (nafion solution), and ultrasonic dispersion is carried out for 30min to form uniform dispersion liquid, so that the catalyst ink is obtained. Performing electrocatalysis performance test by using an electrochemical workstation and an RDE (remote data acquisition) rotating disc electrode, grinding and polishing the glassy carbon electrode before the test, dripping 15 mu L of catalyst ink on the surface of the glassy carbon electrode, naturally drying at room temperature, wherein the surface loading of the electrode is 0.3mg/cm2. A three-electrode system is adopted, a counter electrode is Pt wire, a reference electrode is saturated calomel electrode, the test is carried out in 0.1mol/LKOH solution, and the potential of the standard hydrogen electrode (RHE) is converted. The test was preceded by oxygen saturation for 30 minutes, voltammetric cycling at 1600rpm and 50mV/s sweep rate for 20 cycles to activate the electrode material, followed by linear voltammetric testing (LSV), ORR (oxygen reduction is cathodic reduction) in the range of 1-0.2V (vs RHE) at a sweep rate of 10mV/sReaction) performance testing.
FIG. 1 is an infrared spectrum of 1-butyl-3-aminopropylimidazole bistrifluoromethanesulfonylimide chloride obtained in example 1. As can be seen from the figure: the infrared spectrogram shows that: the C-H stretching vibration peak 3116 and 3155cm on the imidazole ring exists-1(ii) a Expansion vibration peak 1572cm of C ═ N on imidazole structure-1(ii) a C-C stretching vibration peak 1464cm on imidazole ring-1The presence of an imidazole structure is demonstrated; stretching vibration peak 1533cm of N-H on ionic liquid branched chain-1The presence of-NH 2 was demonstrated; and C-F on the TFSI anion stretching vibration peak 1055cm-1And a stretching vibration peak 1136cm of-SO 2-1。
Fig. 2 is a transmission electron micrograph of the ionic liquid functionalized graphene oxide supported cobaltosic oxide nanoparticle composite material obtained in example 1. The photo shows that a large number of cobaltosic oxide nanoparticles with small and uniform particle sizes are uniformly distributed on the surface of the ionic liquid functionalized graphene oxide, and the particle sizes are about 8-15 nm.
FIG. 3 is a linear voltammetry scan curve (sweep rate is 10mV/s, and rotation speed is 1600rpm) of the ionic liquid functionalized graphene oxide supported cobaltosic oxide nanoparticle composite material and the platinum-carbon catalyst obtained in example 1 in 0.1mol/L oxygen saturated KOH solution. The initial potential and half-wave potential of the ionic liquid functionalized graphene oxide supported cobaltosic oxide nanoparticle composite material are respectively 0.84V and 0.71V, which are close to 0.95V and 0.81V of a commercial platinum-carbon catalyst, and the limiting density current at 0.2V is-5.9 mA/cm2The current is higher than the limiting density of the platinum-carbon catalyst and is-4.8 mA/cm2Therefore, the composite material has excellent ORR performance and good conductivity and electrochemical window.
Example 2
(1) Dissolving 5g of 1-butylimidazole and 6g of 3-chloropropylamine hydrochloride in 30mL of absolute ethyl alcohol, carrying out magnetic stirring reflux at the temperature of 90 ℃ for 12 hours to obtain a light yellow liquid, washing the obtained liquid for multiple times by using the absolute ethyl alcohol, carrying out rotary evaporation, and finally drying in a vacuum drying oven at the temperature of 60 ℃ for 10 hours to obtain a light yellow viscous liquid product, namely 1-butyl-3-aminopropylimidazole chloride.
(2) And (2) mixing 2.5g of 1-butyl-3-aminopropylimidazole chloride salt obtained in the step (1) with 4g of lithium bistrifluoromethanesulfonylimide (LITFSI), dissolving in 50mL of deionized water, magnetically stirring at a constant temperature of 50 ℃ for 10 hours under the protection of nitrogen, and performing rotary evaporation to obtain the product 1-butyl-3-aminopropylimidazole bistrifluoromethanesulfonylimide salt.
(3) And (3) mixing 0.6g of graphene oxide in 50mL of deionized water, performing ultrasonic dispersion for 10min to obtain a graphene oxide dispersion solution, dissolving 1g of 1-butyl-3-aminopropylimidazole bistrifluoromethane sulfimide salt obtained in the step (2) in 50mL of graphene oxide dispersion solution, performing magnetic stirring under the protection of nitrogen gas, refluxing at constant temperature of 30 ℃ for 36h, and performing suction filtration for multiple times to obtain the product of ionic liquid functionalized graphene oxide.
(4) And (3) dissolving 10g of divalent cobalt salt in 30mL of sodium hydroxide solution with the mass fraction of 30% to prepare a divalent cobalt salt alkali solution, dissolving 1g of ionic liquid functionalized graphene oxide obtained in the step (3) and 10g of sodium nitrite in 30mL of divalent cobalt salt alkali solution, adding into a reaction kettle with a polytetrafluoroethylene lining, reacting at a constant temperature of 100 ℃ for 12 hours, and performing suction filtration for multiple times to obtain a black solid product, namely the ionic liquid functionalized graphene oxide supported cobaltosic oxide nanoparticle composite material.
The above examples illustrate that the ionic liquid and the functional group on the surface of the graphene oxide form a chemical bond under certain conditions to modify the surface of the graphene oxide, so that the conductivity and the catalytic performance are improved, the defects of easy loss, low conductivity efficiency, easy dissociation, small contact area with a catalyst and the like of the traditional physical mixed additive are overcome, and meanwhile, the ionic liquid fixed on the surface of the graphene oxide can form a synergistic effect with a non-noble metal catalyst, so that the conductivity and the catalytic effect of the material can be further improved. Therefore, the functionalized graphene oxide surface ionic liquid and the uniformly loaded cobaltosic oxide nanoparticles with small particle sizes can overcome the defects of non-noble metal catalysts, and is expected to realize the preparation of the high-quality high-current-density carbon-based oxygen reduction catalytic material with high-efficiency catalysis. The amination ionic liquid introduced by the catalytic material and graphene oxide form electron-donating groups such as acyl groups, so that the electron transfer rate in the catalytic process is accelerated, and meanwhile, the activity of a catalytic process intermediate is improved due to the synergistic effect of cobaltosic oxide and imidazole ionic liquid, the adsorption effect of cobaltosic oxide on oxygen is increased, the O bond breakage is accelerated, the cobaltosic oxide is uniformly distributed, and the particle size is smaller (8-15nm) and uniform.
In conclusion, the ionic liquid functionalized graphene oxide loaded cobaltosic oxide nanoparticle composite material synthesized by the method has the advantages of good conductivity, wide electrochemical window, simple preparation method and good electrocatalytic oxygen reduction performance.
The above description is intended to be illustrative of the preferred embodiments of the present invention and should not be taken to limit the scope of the invention.
The invention is not the best known technology.
Claims (5)
1. A preparation method of an ionic liquid functionalized graphene oxide loaded cobaltosic oxide nanoparticle composite material is characterized by comprising the following steps:
(1) performing ultrasonic dispersion on ionic liquid 1-butyl-3-aminopropylimidazole bistrifluoromethane sulfimide salt and graphene oxide deionized water for 10-60 min, performing magnetic stirring under the protection of nitrogen gas, and performing constant-temperature reflux for 24-36 h at 25-50 ℃ to obtain a product of ionic liquid functionalized graphene oxide;
wherein the mass ratio of the ionic liquid to the graphene oxide is 1: 0.6-1: 0.3; adding 30-50 mL of deionized water into every 1-5 g of ionic liquid;
(2) mixing the ionic liquid functionalized graphene oxide obtained in the previous step, an oxidant and an alkali solution of a divalent cobalt salt, adding the mixture into a reaction kettle with a polytetrafluoroethylene lining, and keeping the temperature at 80-160 ℃ for 8-24 hours to obtain a black solid product, namely, an ionic liquid functionalized graphene oxide loaded cobaltosic oxide nanoparticle composite material;
wherein the mass ratio of the ionic liquid functionalized graphene oxide to the divalent cobalt salt to the oxidant is 1: 10-30;
the alkali solution is a sodium hydroxide solution with the mass fraction of 20-30% or ammonia water with the mass fraction of 20-30%; each 20-30 mL of the alkali solution contains 1-50 g of divalent cobalt salt.
2. The method for preparing an ionic liquid functionalized graphene oxide-supported cobaltosic oxide nanoparticle composite material according to claim 1, wherein the divalent cobalt salt is cobalt chloride hexahydrate or cobalt nitrate hexahydrate.
3. The method for preparing the ionic liquid functionalized graphene oxide-supported cobaltosic oxide nanoparticle composite material according to claim 1, wherein the oxidant is sodium persulfate, hydrogen peroxide, sodium nitrate or sodium nitrite.
4. The preparation method of the ionic liquid functionalized graphene oxide-supported cobaltosic oxide nanoparticle composite material according to claim 1, wherein the preparation method of the ionic liquid comprises the following steps:
(1) dissolving 1-butylimidazole and 3-chloropropylamine hydrochloride in a solvent, and carrying out constant-temperature magnetic stirring reflux for 10-36 h at the temperature of 50-90 ℃ in the atmosphere of nitrogen protection to obtain a yellow liquid product, namely 1-butyl-3-aminopropylimidazole chloride;
wherein the mass ratio of 1-butylimidazole: 3-chloropropylamine hydrochloride is 1: 1.2-1: 1.8; adding 1-butyl imidazole 5-10 g per 10-60 mL of solvent; the solvent can be deionized water, absolute ethyl alcohol and acetonitrile;
(2) mixing the light yellow product obtained in the step (1) with lithium bistrifluoromethanesulfonylimide (LiTFSI), dissolving in deionized water, and magnetically stirring at a constant temperature of 25-50 ℃ for 5-24 hours under the protection of nitrogen to obtain an amination ionic liquid 1-butyl-3-aminopropylimidazole bistrifluoromethanesulfonylimide salt;
wherein the mass ratio is that a light yellow product: LiTFSI is 1: 1.5-1: 2; 2.5-5 g of light yellow product is added into 30-50 mL of deionized water.
5. The application of the ionic liquid functionalized graphene oxide loaded cobaltosic oxide nanoparticle composite material prepared by the method according to claim 1, which is characterized by being used as an oxygen reduction electrocatalytic electrode cathode material.
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