Double-carbon coupling transition metal nickel-based quantum dot electrocatalyst and preparation method thereof

A technology of transition metals and quantum dots, applied in electrodes, electrolytic processes, electrolytic components, etc., to achieve the effects of easy industrial production, high product purity, excellent electrocatalytic activity and stability

Active Publication Date: 2018-12-28
FUDAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, how to design and prepare highly active, stable, inexpensive and readily available bifunctional electrocatalytic materials is still a challenge.

Method used

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  • Double-carbon coupling transition metal nickel-based quantum dot electrocatalyst and preparation method thereof
  • Double-carbon coupling transition metal nickel-based quantum dot electrocatalyst and preparation method thereof
  • Double-carbon coupling transition metal nickel-based quantum dot electrocatalyst and preparation method thereof

Examples

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Comparison scheme
Effect test

Embodiment 1

[0021] Example 1, the preparation method and application of double carbon-coupled transition metal nickel-cobalt quantum dot composite material (Ni@NC@NG), including the following steps:

[0022] (1) Two-dimensional ultra-thin nickel-based zeolite-imidazole framework flake precursor (2DNi-ZIF@GO) of composite graphene oxide was prepared by co-precipitation method: 300 mg of nickel nitrate hexahydrate was weighed and dissolved in 5 mL of methanol solution , Mix the above solution with 10 mL of graphene oxide suspension and stir for 20 min. Further, 5 mL, 300 mg of 2-methylimidazole solution was slowly added to the above mixture, and stirred at room temperature for 10 min; then the mixture was transferred to a 50 mL autoclave and placed at a constant temperature of 180 °C box, reacted for 4 h, cooled at room temperature, centrifuged the product, and washed three times with deionized water. Finally, the product was placed in a freeze dryer at −50 °C and freeze-dried for 48 h, an...

Embodiment 2

[0026] Example 2, the preparation method and application of double carbon-coupled binary transition metal nickel-cobalt quantum dot composite material (NiCo@NC@NG), including the following steps:

[0027](1) Two-dimensional ultrathin nickel-cobalt-based zeolite imidazole framework flake precursor (2D Ni-ZIF@GO) was prepared by co-precipitation method: Weigh 250 mg of nickel nitrate hexahydrate and 50 mg of hexahydrate Cobalt nitrate hydrate was dissolved in 10 mL of methanol solution, and the above solution was fully mixed with 20 mL of graphene oxide suspension, and stirred for 20 min. Further, 5 mL, 400 mg of 2-methylimidazole solution was slowly added to the above mixture, and stirred at room temperature for 10 min; then the mixture was transferred to a 50 mL autoclave and placed in a thermostat at 190 °C , reacted for 6 h, cooled at room temperature, centrifuged the product, and washed 4 times with deionized water. Finally, the product was placed in a freeze dryer at −50 ...

Embodiment 3

[0031] Example 3, the preparation method and application of double carbon-coupled ternary transition metal nickel-cobalt quantum dot composite material (NiCoFe@NC@NG), including the following steps:

[0032] (1) The two-dimensional ultrathin nickel-cobalt-iron nanosheet precursor (2D NiCoFe-ZIF@G) of composite graphene was prepared by co-precipitation method: 200 mg of Ni(NO 3 ) 2 •6H 2 O, 30 mg Co(NO 3 ) 2 •6H 2 O and 30 mg Fe(NO 3 ) 2 •6H 2 O was dissolved in 5 mL of methanol solution, and the above solution was thoroughly mixed with 17 mL of graphene oxide suspension, and stirred for 20 min. Further, 5 mL, 328 mg of 2-methylimidazole solution was slowly added to the above mixture, and stirred at room temperature for 10 min; then the mixture was transferred to a 50 mL autoclave and placed in a thermostat at 180 °C , reacted for 8 h, cooled at room temperature, centrifuged the product, and washed 4 times with deionized water. Finally, the product was placed in a free...

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Abstract

The invention belongs to the technical field of materials and energy, and particularly relates to double-carbon coupling transition metal nickel-based quantum dot electrocatalyst and a preparation method thereof. Two-dimensional nickel-based zeolite imidazole skeleton sheet/ graphene oxide is used as precursor, and through a one-step low-temperature pyrolysis method, the two-dimensional nickel-based zeolite imidazole skeleton sheet/ graphene oxide is converted in situ into two-dimensional nitrogen-doped porous carbon-coated transition metal nickel-based quantum dots/ graphene heterogeneous composite. The composite forms a unique structure of porous carbon and graphene 'double carbon' coupling metal quantum dots, and has the characteristics of strong interfacial interaction, large specificsurface area, high conductivity, abundant nitrogen doping and defects, and uniform dispersion of metal quantum dots; as bifunctional electrocatalyst, excellent electrocatalytic activity and stabilityare showed when being used for hydrogen evolution reaction and oxygen evolution reaction, and high efficiency and economical novel full water decomposition electrocatalyst is provided. According to the double-carbon coupling transition metal nickel-based quantum dot electrocatalyst and the preparation method thereof, the preparation process is simple, the cost is low, and large-scale preparation can be realized.

Description

technical field [0001] The invention belongs to the technical field of materials and energy, and in particular relates to a double-carbon coupled transition metal nickel-based quantum dot electrocatalyst and a preparation method thereof. Background technique [0002] With the depletion of fossil energy and the aggravation of environmental pollution, people are seeking new energy to replace traditional fossil energy. Hydrogen energy, as a clean and renewable energy source, has attracted extensive attention from researchers all over the world. Hydrogen production through electrolysis of water is a practical technology in line with sustainable development, and its power consumption can be provided by wind power, solar cells, etc. The core of the water electrolysis reaction mainly involves the two half-reactions of hydrogen evolution (HER) and oxygen evolution (OER). A high overpotential is required in the process of hydrogen evolution and oxygen evolution in electrolyzed wate...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25B1/04C25B11/06
CPCC25B1/04C25B11/091Y02E60/36
Inventor 吴仁兵陈子亮徐鸿彬哈媛
Owner FUDAN UNIV
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