Preparation method of zinc-air battery catalyst

Abstract

The invention discloses a preparation method of a zinc-air battery catalyst. The preparation method comprises the following steps of: S1, adding 2, 5-dihydroxyterephthalic acid and polyacrylonitrile into N, N-dimethylformamide, carrying out ultrasonic dissolution, and then transferring a solution into an injection pump, and performing electrostatic spinning on an electrostatic spinning receiving roller so as to obtain a layer of fiber membrane I; S2, adding cobalt nitrate hexahydrate and polyacrylonitrile into N, N-dimethylformamide, performing ultrasonic dissolution, then transferring a solution into an injection pump, and performing electrostatic spinning on the fiber membrane I to obtain a layer of fiber membrane II; S3, taking down the fiber membrane II from the receiving roller, cutting the fiber membrane II into 2cm*2cm membranes, stacking the fiber membranes, placing the stacked fiber membranes in a 25mL high-pressure reaction kettle, adding a mixed solvent of which the liquid surface is higher than the height of the fiber membranes, pressing a metal block on the stacked fiber membranes to prevent the fiber membranes from floating, carrying out ultrasonic treatment, performing a reaction at 120-135 DEG C for 24-30 hours, performing cooling, filtering and drying to obtain a precursor; and S4, uniformly mixing the precursor obtained in the step S3 with calcium salt, then putting the mixture into a tubular furnace, and calcining the mixture in a mixed gas atmosphere to obtain the catalyst Co-MOF-74 (at) C / Ca.

Description

technical field

[0001] The invention belongs to the technical field of catalysts, and in particular relates to a preparation method of a zinc-air battery catalyst. Background technique

[0002] With the increasingly serious problems of environmental pollution and energy crisis, people's demand for developing new energy storage devices with high efficiency and low cost is becoming more and more urgent. Among them, Zn-air batteries have received special attention due to their environmental friendliness and high energy density. In Zn-air batteries, the oxygen reduction (ORR) reaction plays a crucial role.

[0003] The basic structure of a zinc-air battery consists of a porous air electrode with a catalyst, a metal zinc electrode, and an alkaline electrolyte. The reaction equation is as follows

[0004] Anode: Zn+4OH - =Zn(OH) 4 2- +2e - ;

[0005] Zn(OH) 4 2- =ZnO+H 2 O+2OH - ;

[0006] Cathode: O 2 +2H 2 O+4e - =4OH - ;

[0007] Overall reaction formula: 2Zn+O...

Examples

Embodiment 1

[0027] A preparation method of a zinc-air battery catalyst, specifically comprising the following steps:

[0028] S1: Add 2,5-dihydroxyterephthalic acid and polyacrylonitrile into N,N-dimethylformamide, dissolve it ultrasonically, and then transfer it to a syringe pump. At an injection voltage of 16kV, the injection distance 12cm, and the injection rate was 0.8mL / h on the electrospinning receiving roll to obtain a layer of fiber film I; wherein the mass ratio of 2,5-dihydroxyterephthalic acid to polyacrylonitrile was 0.11:0.44.

[0029] S2: Add cobalt nitrate hexahydrate and polyacrylonitrile into N,N-dimethylformamide, ultrasonically dissolve it, and then transfer it to a syringe pump. The injection voltage is 14kV, the injection distance is 10cm, and the injection rate is Electrospun fiber membrane I was electrospun at 0.6mL / h to obtain a layer of fiber membrane II; wherein the mass ratio of cobalt nitrate hexahydrate to polyacrylonitrile was 1.6:1.8.

[0030] S3: Remove th...

Embodiment 2

[0033] A preparation method of a zinc-air battery catalyst, specifically comprising the following steps:

[0034] S1: Add 2,5-dihydroxyterephthalic acid and polyacrylonitrile into N,N-dimethylformamide, dissolve it ultrasonically, and then transfer it to a syringe pump. At an injection voltage of 18kV, the injection distance 15cm, the injection rate is 1.0mL / h on the electrospinning receiving roll to obtain a layer of fiber film I; wherein the mass ratio of 2,5-dihydroxyterephthalic acid and polyacrylonitrile is 0.19:0.96.

[0035] S2: Add cobalt nitrate hexahydrate and polyacrylonitrile into N,N-dimethylformamide, ultrasonically dissolve it, and then transfer it to a syringe pump. The injection voltage is 16kV, the injection distance is 12cm, and the injection rate is On the electrospun fiber membrane I at 0.8mL / h, a layer of fiber membrane II was obtained; wherein the mass ratio of cobalt nitrate hexahydrate and polyacrylonitrile was 2.9:3.5.

[0036] S3: Remove the fiber m...

Embodiment 3

[0039] A preparation method of a zinc-air battery catalyst, specifically comprising the following steps:

[0040] S1: Add 2,5-dihydroxyterephthalic acid and polyacrylonitrile into N,N-dimethylformamide, dissolve it ultrasonically, and then transfer it to a syringe pump. At an injection voltage of 17kV, the injection distance 13cm, and the injection rate was 0.9mL / h on the electrospinning receiving roll to obtain a layer of fiber film I; wherein the mass ratio of 2,5-dihydroxyterephthalic acid to polyacrylonitrile was 0.16:0.77.

[0041] S2: Add cobalt nitrate hexahydrate and polyacrylonitrile into N,N-dimethylformamide, ultrasonically dissolve it, and then transfer it to a syringe pump. The injection voltage is 15kV, the injection distance is 11cm, and the injection rate is Electrospun fiber membrane I was electrospun at 0.7mL / h to obtain a layer of fiber membrane II; wherein the mass ratio of cobalt nitrate hexahydrate to polyacrylonitrile was 2.3:2.9.

[0042] S3: Remove the ...

technical field

[0001] The invention belongs to the technical field of catalysts, and in particular relates to a preparation method of a zinc-air battery catalyst. Background technique

[0002] With the increasingly serious problems of environmental pollution and energy crisis, people's demand for developing new energy storage devices with high efficiency and low cost is becoming more and more urgent. Among them, Zn-air batteries have received special attention due to their environmental friendliness and high energy density. In Zn-air batteries, the oxygen reduction (ORR) reaction plays a crucial role.

[0003] The basic structure of a zinc-air battery consists of a porous air electrode with a catalyst, a metal zinc electrode, and an alkaline electrolyte. The reaction equation is as follows

[0004] Anode: Zn+4OH - =Zn(OH) 4 2- +2e - ;

[0005] Zn(OH) 4 2- =ZnO+H 2 O+2OH - ;

[0006] Cathode: O 2 +2H 2 O+4e - =4OH - ;

[0007] Overall reaction formula: 2Zn+O...

Examples

Embodiment 1

[0027] A preparation method of a zinc-air battery catalyst, specifically comprising the following steps:

[0028] S1: Add 2,5-dihydroxyterephthalic acid and polyacrylonitrile into N,N-dimethylformamide, dissolve it ultrasonically, and then transfer it to a syringe pump. At an injection voltage of 16kV, the injection distance 12cm, and the injection rate was 0.8mL / h on the electrospinning receiving roll to obtain a layer of fiber film I; wherein the mass ratio of 2,5-dihydroxyterephthalic acid to polyacrylonitrile was 0.11:0.44.

[0029] S2: Add cobalt nitrate hexahydrate and polyacrylonitrile into N,N-dimethylformamide, ultrasonically dissolve it, and then transfer it to a syringe pump. The injection voltage is 14kV, the injection distance is 10cm, and the injection rate is Electrospun fiber membrane I was electrospun at 0.6mL / h to obtain a layer of fiber membrane II; wherein the mass ratio of cobalt nitrate hexahydrate to polyacrylonitrile was 1.6:1.8.

[0030] S3: Remove th...

Embodiment 2

[0033] A preparation method of a zinc-air battery catalyst, specifically comprising the following steps:

[0034] S1: Add 2,5-dihydroxyterephthalic acid and polyacrylonitrile into N,N-dimethylformamide, dissolve it ultrasonically, and then transfer it to a syringe pump. At an injection voltage of 18kV, the injection distance 15cm, the injection rate is 1.0mL / h on the electrospinning receiving roll to obtain a layer of fiber film I; wherein the mass ratio of 2,5-dihydroxyterephthalic acid and polyacrylonitrile is 0.19:0.96.

[0035] S2: Add cobalt nitrate hexahydrate and polyacrylonitrile into N,N-dimethylformamide, ultrasonically dissolve it, and then transfer it to a syringe pump. The injection voltage is 16kV, the injection distance is 12cm, and the injection rate is On the electrospun fiber membrane I at 0.8mL / h, a layer of fiber membrane II was obtained; wherein the mass ratio of cobalt nitrate hexahydrate and polyacrylonitrile was 2.9:3.5.

[0036] S3: Remove the fiber m...

Embodiment 3

[0039] A preparation method of a zinc-air battery catalyst, specifically comprising the following steps:

[0040] S1: Add 2,5-dihydroxyterephthalic acid and polyacrylonitrile into N,N-dimethylformamide, dissolve it ultrasonically, and then transfer it to a syringe pump. At an injection voltage of 17kV, the injection distance 13cm, and the injection rate was 0.9mL / h on the electrospinning receiving roll to obtain a layer of fiber film I; wherein the mass ratio of 2,5-dihydroxyterephthalic acid to polyacrylonitrile was 0.16:0.77.

[0041] S2: Add cobalt nitrate hexahydrate and polyacrylonitrile into N,N-dimethylformamide, ultrasonically dissolve it, and then transfer it to a syringe pump. The injection voltage is 15kV, the injection distance is 11cm, and the injection rate is Electrospun fiber membrane I was electrospun at 0.7mL / h to obtain a layer of fiber membrane II; wherein the mass ratio of cobalt nitrate hexahydrate to polyacrylonitrile was 2.3:2.9.

[0042] S3: Remove the ...

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