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Cobalt sulfide doped nanoporous carbon electrocatalyst as well as preparation method and application thereof

A nanoporous carbon and electrocatalyst technology, applied in the direction of fuel cell half-cells and primary battery half-cells, circuits, electrical components, etc., can solve the problem of poor stability, insufficient durability, and limited resources of platinum-based catalysts. and other problems, to achieve the effect of improving electrocatalytic activity, catalytic activity, and specific surface area

Active Publication Date: 2018-08-10
BEIHANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although platinum-based materials are the most efficient electrocatalysts for oxygen reduction, their high price and scarcity of resources limit their application in clean energy devices.
In addition, platinum-based catalysts have poor stability in electrolytes and suffer from insufficient durability.

Method used

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  • Cobalt sulfide doped nanoporous carbon electrocatalyst as well as preparation method and application thereof
  • Cobalt sulfide doped nanoporous carbon electrocatalyst as well as preparation method and application thereof
  • Cobalt sulfide doped nanoporous carbon electrocatalyst as well as preparation method and application thereof

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preparation example Construction

[0035]The invention provides a kind of preparation method of cobalt sulfide doped nanoporous carbon electrocatalyst, comprises the steps:

[0036] Electrospinning after the first mixing of 2-aminoterephthalic acid, water-soluble aluminum salt and organic solvent to obtain a spinning film;

[0037] Drying the spun film to obtain nitrogen-doped aluminum metal MOFs;

[0038] The thiourea, water-soluble cobalt salt, ethanol aqueous solution and n-hexane are mixed for the second time to obtain a mixed solution;

[0039] The nitrogen-doped aluminum metal MOFs and the mixed solution are coated with a two-phase interface, and solid-liquid separation is performed to obtain nitrogen-sulfur-doped cobalt-aluminum bimetallic MOFs;

[0040] in N 2 atmosphere, the nitrogen-sulfur doped cobalt aluminum bimetallic MOFs are pyrolyzed to obtain cobalt sulfide doped nanoporous carbon electrocatalysts.

[0041] In the present invention, 2-aminoterephthalic acid, water-soluble aluminum salt and ...

Embodiment 1

[0074] 1) Preparation of nitrogen-doped aluminum metal MOFs:

[0075] 2-aminoterephthalic acid (2.24g) and AlCl 3 ·6H 2 O (2.04g) was dissolved in 120mL N,N-dimethylformamide (DMF), and ultrasonicated for 30min to make the solution evenly mixed. Then transfer the above solution to a 10ml plastic syringe with a 18-gauge blunt needle, and perform electrospinning at a speed of 0.1-0.3ml / h. The distance is 12cm, and the thickness of the spun film is controlled at 300 μm to 400 μm; the obtained spun film is vacuum-dried at 60°C for 12 hours to obtain NH 2 -MIL-101(Al) is nitrogen-doped aluminum metal MOFs.

[0076] 2) Preparation of nitrogen-sulfur doped cobalt-aluminum bimetallic MOFs:

[0077] Thiourea (TU100mg), CoCl 2 ·6H 2 O (100 mg), dissolved in 67 mL of water-ethanol solution (3:1, v / v). The above solution was dripped into n-hexane (80mL) dropwise, and stirred at a maximum speed for 30min during the dripping process to obtain a mixed solution; the dried NH 2 -MIL-10...

Embodiment 2

[0081] 1) Preparation of nitrogen-doped aluminum metal MOFs:

[0082] 2-aminoterephthalic acid (2.5g) and AlCl 3 ·6H 2 O (2.26g) was dissolved in 130mL of N,N-dimethylformamide (DMF), and ultrasonicated for 20min to make the solution evenly mixed. Then the above solution was transferred to a 10ml plastic syringe with a 18-gauge blunt pointed needle, and electrospinning was carried out at a speed of 0.2ml / h. The spinning machine applied a voltage of 20kV, and the distance from the needle tip to the receiver tin foil was 12cm, the thickness of the spun membrane is controlled at 300μm-400μm; the obtained spun membrane is vacuum-dried at 40°C for 18h to obtain NH 2 -MIL-101(Al) is nitrogen-doped aluminum metal MOFs.

[0083] 2) Preparation of nitrogen-sulfur doped cobalt-aluminum bimetallic MOFs:

[0084] Thiourea (TU80mg), CoCl 2 ·6H 2 O (80mg), dissolved in 60mL water-ethanol solution (3:1, v / v). The above solution was dripped into normal hexane (80mL), and stirred at a r...

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Abstract

The invention relates to the technical field of electrocatalysts, and provides a preparation method of a cobalt sulfide doped nanoporous carbon electrocatalyst. The preparation method comprises the steps of mixing 2-aminoterephthalic acid, water-soluble aluminum salt and an organic solvent for the first time and then electrospinning to obtain a spun film; drying the spun film to obtain nitrogen-doped aluminum metal MOFs; mixing thiourea, water-soluble cobalt salt, an ethanol aqueous solution and n-hexane for the second time to obtain a mixed solution; carrying out two-phase interface coating on the nitrogen-doped aluminum metal MOFs and the mixed solution, and carrying out solid-liquid separation to obtain nitrogen-sulfur doped cobalt-aluminum bimetallic MOFs; pyrolyzing the nitrogen-sulfur doped cobalt-aluminum bimetallic MOFs in the N2 atmosphere to obtain the cobalt sulfide doped nanoporous carbon electrocatalyst. The cobalt sulfide doped nanoporous carbon electrocatalyst prepared by the method has excellent electrocatalytic activity and durability.

Description

technical field [0001] The invention relates to the technical field of electrocatalysts, in particular to a cobalt sulfide-doped nanoporous carbon electrocatalyst and its preparation method and application. Background technique [0002] The current mainstream batteries are divided into two categories, lithium-ion batteries and hydrogen-oxygen fuel cells. Among them, the production process of hydrogen in hydrogen-oxygen fuel cells is complicated, gas storage and transportation are difficult, and the cost is high. There are many hidden dangers in practical applications. Metals such as aluminum and magnesium are usually used to replace hydrogen to form metal fuel cells. Metal fuel cells that use aluminum as fuel are collectively referred to as aluminum-air fuel cells, or aluminum-air batteries. A traditional aluminum-air fuel cell consists of an aluminum alloy negative electrode, an electrolyte, an air positive electrode, a battery case, and a collector plate. The air positive...

Claims

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Application Information

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IPC IPC(8): H01M4/90H01M12/06
CPCH01M4/90H01M4/9083H01M12/06
Inventor 卢惠民王俊人邓燕蔡伟洪清水
Owner BEIHANG UNIV
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