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Rechargeable zinc-air battery bifunctional catalyst and preparation method and application thereof

A bifunctional catalyst, zinc-air battery technology, applied in battery electrodes, fuel cell-type half-cells and secondary battery-type half-cells, circuits, etc. It can improve the stability and conductivity, enhance the gas adsorption efficiency, and stabilize the three-dimensional network structure.

Active Publication Date: 2020-02-25
ZHEJIANG SCI-TECH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, for zinc-air batteries, the oxygen evolution reaction and oxygen reduction reaction at the air electrode during charge and discharge are more difficult to carry out than that of the negative electrode zinc. The solubility of oxygen in water is low, and it is difficult to adsorb on the surface of the air electrode. It is very large (498kJ / mol), and it is difficult to break, resulting in relatively slow kinetics of the positive electrode, and greater overpotential at the same current density. The voltage loss mainly comes from the positive electrode, which is one of the core elements restricting the performance of zinc-air batteries. one
At present, platinum and its alloys are often used as monofunctional catalysts for the oxygen reduction reaction, while ruthenium and iridium are currently the most efficient catalysts for the oxygen evolution reaction, but the oxygen reduction reaction activity is very low, so it is necessary to develop a cheap and ORR catalyst. / OER bifunctional catalyst
[0005] At present, transition metal (Ni, Co, Fe, Mo, and W) oxides, sulfides, phosphides, and hydroxides have been widely developed as ORR / OER bifunctional catalysts, showing excellent electrochemical activity, but It has the disadvantage of poor conductivity
Carbon nanotubes have unique hollow structure, excellent electronic conductivity, high mechanical strength, high specific surface area and good chemical stability, and are considered to be an ideal electrocatalyst support material. However, due to untreated Carbon nanotubes have low surface activity (inert and hydrophobic), and are difficult to disperse in most organic or inorganic solvents, so it is not easy to uniformly deposit small active metal or metal oxide nanoparticles on their surface.

Method used

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  • Rechargeable zinc-air battery bifunctional catalyst and preparation method and application thereof

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Embodiment 1

[0031] A bifunctional catalyst for a rechargeable zinc-air battery, the structural unit of which is: amino carbon nanotubes (NH 2 -CNTs) as the conductive network on which the nickel-cobalt bimetallic@nickel-cobalt bimetallic oxide composite nanoparticles are loaded.

[0032] The preparation method of the bifunctional catalyst for the rechargeable zinc-air battery comprises the following steps:

[0033] Step 1, the synthesis of aminocarbon nanotubes:

[0034] Put 140 mg of carbon nanotubes into 100 mL of a mixture of sulfuric acid (95%) and nitric acid (40%) (the volume ratio of the two is 3:1), ultrasonically vibrate for 4 hours, and wash the oxidized carbon nanotubes by centrifugation. Dry in an oven at 70°C for 12 hours, then add 60 mg of oxidized carbon nanotubes to 5 mL of ethylenediamine, 50 mL of dimethylacetamide and 192 mg of sodium nitrite, form a uniform suspension under the action of ultrasonic waves, and transfer it to a hydrothermal reaction kettle. React at 12...

Embodiment 2

[0044] Embodiment 2: A preparation method of a bifunctional catalyst for a rechargeable zinc-air battery, specifically comprising the following steps:

[0045] Step 1, the synthesis of aminocarbon nanotubes

[0046] Put 140mg of carbon nanotubes into 100mL of a mixture of sulfuric acid (95%) and nitric acid (40%) (the volume ratio of the two is 3:1), ultrasonically vibrate for 4 hours, and the oxidized carbon nanotubes produced are washed by centrifugation and washed in Dry in an oven at 70°C for 12 hours, then add 60 mg of carbon dioxide nanotubes to 5 mL of ethylenediamine, 50 mL of dimethylacetamide and 192 mg of sodium nitrite, form a uniform suspension under the action of ultrasonic waves, transfer it to a hydrothermal reaction kettle, and React at 120° C. for 12 hours, and the resulting amino carbon nanotubes are filtered, washed with deionized water, and finally dried in a vacuum oven at 60° C. for 12 hours.

[0047] Step 2, synthesis of aminocarbon nanotube-supported ...

Embodiment 3

[0051] Embodiment 3: A preparation method of a bifunctional catalyst for a rechargeable zinc-air battery, specifically comprising the following steps:

[0052] Step 1, the synthesis of aminocarbon nanotubes

[0053]Put 140mg of carbon nanotubes into 100mL of a mixture of sulfuric acid (95%) and nitric acid (40%) (the volume ratio of the two is 3:1), ultrasonically vibrate for 4 hours, and the oxidized carbon nanotubes produced are washed by centrifugation and washed in Dry in an oven at 70°C for 12 hours, then add 60 mg of carbon dioxide nanotubes to 5 mL of ethylenediamine, 50 mL of dimethylacetamide and 192 mg of sodium nitrite, form a uniform suspension under the action of ultrasonic waves, transfer it to a hydrothermal reaction kettle, and React at 120° C. for 12 hours, and the resulting amino carbon nanotubes are filtered, washed with deionized water, and finally dried in a vacuum oven at 60° C. for 12 hours.

[0054] Step 2, synthesis of aminocarbon nanotube-supported n...

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Abstract

The invention discloses a rechargeable zinc-air battery bifunctional catalyst and a preparation method and application thereof. The structural unit is as follows: amino carbon nanotubes are used as aconductive network, and nickel-cobalt bimetal@nickel-cobalt bimetal oxide composite nanoparticles are loaded on the amino carbon nanotubes. The preparation method comprises the following steps of: preparing amino carbon nanotubes and preparing amino carbon nanotube loaded nickel-cobalt bimetal@nickel-cobalt bimetal oxide composite nanoparticles from the amino carbon nanotubes, nickel and cobalt transition metal salt and a reducing agent. The application of the rechargeable zinc-air battery bifunctional catalyst in catalyzing ORR and OER reactions of rechargeable zinc-air batteries can significantly enhance the adsorption efficiency of adsorbed gas and improve the stability and conductivity, and the rechargeable zinc-air battery bifunctional catalyst has low overpotential and cost in ORR and OER reactions, and can meet the requirements of commercial application.

Description

technical field [0001] The invention belongs to the technical field of catalysts for rechargeable zinc-air batteries, and specifically relates to a bifunctional catalyst for rechargeable zinc-air batteries in the form of amino carbon nanotube-supported nickel-cobalt bimetal@nickel-cobalt bimetallic oxide composite nanoparticles and its preparation method and application. Background technique [0002] Energy is an important material basis for improving people's living standards and developing a country's economy. Traditional energy applications such as coal, oil, and natural gas have serious problems such as environmental pollution and greenhouse effects. Therefore, the rational and efficient use of clean energy while maintaining the balance of the ecological environment, especially the development and utilization of new energy has become a research and development hotspot in the field of energy at home and abroad. [0003] Oxygen reduction reaction (ORR) and oxygen evolutio...

Claims

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Application Information

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IPC IPC(8): H01M4/90H01M12/08B82Y30/00
CPCB82Y30/00H01M4/9016H01M4/9041H01M4/9083H01M12/08Y02E60/10
Inventor 潘泓舟曹雨薇蒋仲庆韩佳奇白云飞尚小楠陈巍衡
Owner ZHEJIANG SCI-TECH UNIV