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A two-dimensional cuco 2 the s 4 Nanosheets and their preparation methods and applications as electrocatalysts in oxygen reduction and oxygen evolution reactions

A nanosheet and reaction technology, applied in the field of nanomaterials and its preparation and application, to achieve the effects of excellent performance and stability, low overpotential, and short reaction time

Inactive Publication Date: 2017-06-23
NANJING NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Currently, on CuCo 2 S 4 There are few reports on nanomaterials, especially CuCo with two-dimensional nanostructure 2 S 4 Not yet reported

Method used

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  • A two-dimensional cuco <sub>2</sub> the s <sub>4</sub> Nanosheets and their preparation methods and applications as electrocatalysts in oxygen reduction and oxygen evolution reactions
  • A two-dimensional cuco <sub>2</sub> the s <sub>4</sub> Nanosheets and their preparation methods and applications as electrocatalysts in oxygen reduction and oxygen evolution reactions
  • A two-dimensional cuco <sub>2</sub> the s <sub>4</sub> Nanosheets and their preparation methods and applications as electrocatalysts in oxygen reduction and oxygen evolution reactions

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1 2

[0033] Example 1 Two-dimensional CuCo 2 S 4 Preparation of nanosheets

[0034] At room temperature, in a clean, dry 250mL three-necked flask, add 0.08g Cu(acac) 2 and 0.15g Co(acac) 2 Solid, 10mL DDA, ultrasonic dispersion, the above mixture at 5 ℃ min -1 The heating rate was heated to 120°C, and after 30min of incubation, 1.2mL of DDT was added, and continued at 5°C for min -1 The heating rate was raised to 245 °C, kept at this temperature for 10 minutes, then stopped, cooled naturally to room temperature, centrifuged, washed, and two-dimensional CuCo 2 S 4 Nanosheets.

[0035] The prepared two-dimensional CuCo was tested by EDS, XRD and element mapping 2 S 4 Nanosheet components were analyzed (e.g. figure 1 , 2 , 5(A), 5(B), 5(C), 5(D)). figure 1 The peaks of C and O come from the organic capping reagents and air adsorbed on the surface, and the rest are peaks of three elements of Cu, Co, and S, and their atomic number ratio is close to 1:2:4, indicating that the ...

Embodiment 2 2

[0037] Example 2 Two-dimensional CuCo 2 S 4 Preparation of nanosheets

[0038] At room temperature, in a clean, dry 250mL three-necked flask, add 1.3g Cu(acac) 2 and 2.5g Co(acac) 2 Solid, 25mL DDA, ultrasonic dispersion, the above mixture at 5 ℃ min -1 Heat up to 120°C at a heating rate of 30 minutes, add 20 mL of DDT, continue to heat up to 245°C at a heating rate of 5°C min-1, stop at this temperature for 30 minutes, cool naturally to room temperature, and centrifuge , washed to obtain two-dimensional CuCo 2 S 4 Nanosheets.

[0039] EDS, XRD and TEM were used to characterize the obtained product, and the obtained product was still CuCo 2 S 4 Nanosheets.

Embodiment 3

[0040] Example 3 Two-dimensional CuCo 2 S 4 Application of nanosheets as electrocatalysts in ORR and OER

[0041] 2D CuCo 2 S 4 The test method of nanosheets as electrocatalysts to catalyze ORR and OER is as follows: Weigh 2.5 mg of CuCo 2 S 4 Nanosheets, dissolved in a mixed solution of 0.5mL water, 0.5mL ethanol and 40μL naphthol, the concentration of the solution is 2.5mgmL -1 , after the ultrasonic dispersion is uniform, take 8 μL of the above solution, and drop it on a clean rotating disc glassy carbon electrode, N 2 After drying under the sun, repeat the above operation once, and it can be used for electrochemical test after drying.

[0042] For an ORR response, first at N 2 Cyclic voltammetry was performed in saturated 0.1M KOH solution. After it stabilized, the gas was replaced with O 2 , into the electrolyte, the cyclic voltammetry test is also performed, and the polarization curves at different rotational speeds are measured after it stabilizes.

[0043] Fo...

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Abstract

The invention discloses a two-dimensional CuCo 2 S 4 Nanosheets, preparation methods thereof and applications as electrocatalysts in ORR and OER. The preparation method adds copper acetylacetonate, cobalt acetylacetonate, and dodecylamine into a reactor, and heats up the temperature to 100-130°C at a certain rate for reaction; then adds dodecyl mercaptan into the reactor, and heats up the temperature at a certain rate. React at 220-260°C, cool the reaction product to room temperature, centrifuge, wash and dry to obtain two-dimensional CuCo 2 S 4 Nanosheets. The preparation method synthesizes two-dimensional CuCo at normal pressure and lower temperature through solid-liquid phase chemical reaction. 2 S 4 Nanosheets have simple process, short reaction time, strong repeatability, and are suitable for mass production. At present, the two-dimensional CuCo according to the present invention 2 S 4 The synthesis method, morphology and application of nanosheets as electrocatalysts in electrocatalytic ORR and OER have not been reported. They have broad application prospects in the field of cheap alkaline fuel cells.

Description

technical field [0001] The present invention relates to a kind of nanometer material and its preparation and application, particularly a kind of CuCo 2 S 4 Nanosheets and their preparation methods and applications as electrocatalysts in oxygen reduction (ORR) and oxygen evolution reaction (OER). Background technique [0002] With the urgent need for clean energy, scientists are constantly looking for ways to reduce carbon dioxide emissions, that is, to use new sustainable resources and reduce dependence on fossil fuels. Among them, designing low-cost, highly active catalysts for energy conversion and storage devices is an important approach. Oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) are key electrode processes in various sustainable energy technologies, such as metal-air batteries, renewable fuel cells, hydrolysis, and solar fuels. However, the ORR and OER processes are limited by sluggish kinetics, and thus, electrocatalysts are crucial in these...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J27/043
CPCB82Y30/00B82Y40/00C01G51/006B01J27/043C01P2004/04C01P2004/03C01P2002/72B01J35/33
Inventor 包建春赵树林韩敏
Owner NANJING NORMAL UNIVERSITY
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