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 CuCo2S4 nanosheet, a preparation method thereof and an application thereof as an electrocatalyst during the oxygen reduction reaction (ORR) and the oxygen evolution reaction (OER). The preparation method comprises the steps of adding copper acetylacetonate, cobalt acetylacetonate and dodecylamine into a reactor, heating the obtained mixture at a certain rate to 100-130 DEG C for further reaction, adding lauryl mercaptan into the above reactor, heating at a certain rate to 220-260 DEG C for further reaction, cooling the obtained reaction product to the room temperature, centrifugalizing, washing and drying to obtain the two-dimensional CuCo2S4 nanosheet. The solid-liquid phase chemical reaction is conducted according to the preparation method, and the two-dimensional CuCo2S4 nanosheet is synthesized at the normal pressure and at a relatively low temperature. Therefore, the method is simple in process, short in reaction time and high in repeatability, and is suitable for mass production. Currently, the synthesis method and the morphology of the two-dimensional CuCo2S4 nanosheet, and the application of the above two-dimensional CuCo2S4 nanosheet as the electrocatalyst during the ORR and the OER are not reported. Therefore, the two-dimensional CuCo2S4 nanosheet has a wide application prospect in the fields of low-cost 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
CPCB01J27/043B01J35/0033B82Y30/00B82Y40/00C01G51/006C01P2002/72C01P2004/03C01P2004/04
Inventor 包建春赵树林韩敏
Owner NANJING NORMAL UNIVERSITY
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