A kind of carbon-based catalyst using biomass cotton and its preparation method and application

A catalyst and biomass technology, which is applied in the field of biomass cotton as carbon-based catalyst and its preparation, can solve the problems of poor effect of soaking and absorbing solution, affecting catalytic activity, and poor doping effect, and achieves environmental friendliness and responsiveness. The effect of short time and high catalytic activity

CN109473686BActive Publication Date: 2021-09-07NINGBO GRAPHENE INNOVATION CENT CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Publication Date
2021-09-07

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Abstract

The embodiment of the present invention relates to a catalyst based on biomass cotton and its preparation method and application. M-N-C active sites are formed from cotton, metal salt and nitrogen source, wherein the cotton passes through the metal salt, Nitrogen source doping, ammonia gas engraving and pore-making treatment at high temperature, to obtain a microrod structure with nano-metal particles and nano-pores attached. The catalyst has high-efficiency and stable ORR catalytic activity and low production cost, and is applied in metal-air batteries to reduce battery cost and improve battery performance.
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Description

technical field

[0001] The invention relates to the technical field of metal-air batteries, in particular to a carbon-based catalyst using biomass cotton as well as its preparation method and application. Background technique

[0002] A metal-air battery is an electrochemical reaction device consisting of three parts: a metal anode, an air cathode, and an electrolyte solution. Metal anodes usually use metal materials with relatively negative electrode potential, such as magnesium, aluminum, zinc, cadmium, iron, etc. The metal anode is used as a fuel, and the product is clean and pollution-free, and the price is relatively cheap. The electrolyte solution is lye or neutral saline solution. The air cathode is usually composed of a hydrophobic layer, a collector layer and a catalytic active layer, and directly uses oxygen in the air as an oxidant. Relatively cheap fuel, the price of the air cathode often determines the cost of the battery. However, in air cathodes, the cathod...

Examples

Embodiment 1

[0066] (1) Take 24g of cotton, put it into an airtight container containing a mixed solution of deionized water and ethanol (ratio 1:1), heat it in an oven at 100°C for 2 hours, and after cooling to room temperature, take out the cotton and put it in drying in an oven;

[0067] (2) Take by weighing ferric chloride 5.4g, cobalt chloride 3.1g, polym-phenylenediamine 1.2g, hydroxylamine chloride 3.4g and be mixed with uniform mixed solution;

[0068] (3) Weigh the dried cotton of step (1) and immerse it in the mixed solution in step (2), then put it into a lyophilizer, and freeze and dry it in a vacuum for 48 hours;

[0069] (4) Put the freeze-dried cotton in step (3) into a porcelain boat, and place it under inert N 2 In an air atmosphere, calcine at 1200°C for 0.5 hours in a microwave oven for 30 minutes, where ammonia gas is introduced at 500°C for 5 minutes, and then cooled to room temperature;

[0070] (5) Take the product in step (4) out of the tube furnace, perform ball ...

Embodiment 2

[0076] (1) Take 24g of cotton, put it into a closed container containing 10 times the amount of deionized water and ethanol mixed solution (ratio 1:1), heat it in an oven at 80°C for 5 hours, and take out the cotton after cooling to room temperature , put into the oven to dry;

[0077] (2) Take by weighing ferric chloride 5.4g, cobalt chloride 3.1g, polym-phenylenediamine 1.2g, hydroxylamine chloride 3.4g and be mixed with uniform mixed solution;

[0078] (3) Weigh the dried cotton of step (1) and immerse it in the mixed solution in step (2), then put it into a lyophilizer, and freeze and dry it in vacuum for 36 hours;

[0079] (4) Put the freeze-dried cotton in step (3) into a porcelain boat, and in an inert argon atmosphere, heat it up to calcination at 1000°C for 1 hour in a microwave oven in an inert argon atmosphere. Ammonia for 10 minutes, then cooled to room temperature;

[0080] (5) Take the product in step (4) out of the tube furnace, perform ball milling for 20 min...

Embodiment 3

[0085](1) Take 24g of cotton, put it into an airtight container containing 5 times the mixed solution of deionized water and ethanol (ratio 2:1), heat it in an oven at 100°C for 2 hours, and take out the cotton after cooling to room temperature , put into the oven to dry;

[0086] (2) Take by weighing ferric chloride 5.4g, cobalt chloride 3.1g, polym-phenylenediamine 1.2g, hydroxylamine chloride 3.4g and be mixed with uniform mixed solution;

[0087] (3) Weigh the dried cotton of step (1) and immerse it in the mixed solution in step (2), then put it into a lyophilizer, and freeze and dry it in vacuum for 72 hours;

[0088] (4) Put the freeze-dried cotton in step (3) into a porcelain boat, and in an inert N2 gas atmosphere, rise to calcination at 1200° C. for 0.1 hour in a microwave oven for 40 minutes, wherein at 600° C. Ammonia for 5 minutes, then cooled to room temperature;

[0089] (5) Take the product in step (4) out of the tube furnace, perform ball milling for 40 minut...