Electrocatalyst ZIF-9 (III)/Co LDH nanosheet composite material and preparation method thereof

A ZIF-9, electrocatalyst technology, applied in chemical instruments and methods, physical/chemical process catalysts, organic compound/hydride/coordination complex catalysts, etc., can solve the problem of expensive, high temperature and high pressure, composite material dispersion Sexual problems, etc.

Active Publication Date: 2020-10-20
GUANGXI NORMAL UNIV
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Problems solved by technology

However, the methods for successfully compounding two two-dimensional materials mainly focus on hydrothermal reaction, co-precipitation reaction, layer-by-layer assembly and exfoliation accumulation. These methods are complicated to operate, require high temperature and high pressure, and require expensive additives. Composite materials with poor dispersion

Method used

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  • Electrocatalyst ZIF-9 (III)/Co LDH nanosheet composite material and preparation method thereof
  • Electrocatalyst ZIF-9 (III)/Co LDH nanosheet composite material and preparation method thereof
  • Electrocatalyst ZIF-9 (III)/Co LDH nanosheet composite material and preparation method thereof

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preparation example Construction

[0032] A preparation method of an electrocatalyst ZIF-9(III) / Co LDH nanosheet composite material, using imidazole metal organic framework ZIF9(I) as a precursor, comprising the following steps:

[0033] (1) Weigh 0.63g of cobalt nitrate hexahydrate, and use ultrasonic to disperse evenly in 25mL of N,N-dimethylformamide solvent to obtain solution A; weigh 0.14g of benzimidazole, and use ultrasonic to disperse evenly in 25mL of N,N-dimethylformamide solvent. , in N-dimethylformamide solvent to obtain solution B; the ultrasonic power is 250W, and the ultrasonic time is 10 minutes;

[0034] (2) Mix solution A and solution B and stir evenly to obtain mixed solution C; put it in an oil bath and reflux for 24 hours, then wash with N,N-dimethylformamide and dichloromethane respectively, and collect by centrifugation. To obtain a three-dimensional ZIF-9(I), the reflow temperature was set to 140°C;

[0035] (3) 0.08g ZIF-9(I) prepared by step (2) is mixed with 0.16g cobalt nitrate, disso...

Embodiment 7

[0038] Example 7 (the molar ratio of cobalt nitrate and benzimidazole is 2:1, and the mass ratio of ZIF-9(I) and cobalt nitrate is 1:1)

[0039] A preparation method of an electrocatalyst ZIF-9(III) / Co LDH nanosheet composite material, using imidazole metal organic framework ZIF9(I) as a precursor, comprising the following steps:

[0040] (1) Weigh 0.63g of cobalt nitrate hexahydrate, and use ultrasonic to disperse evenly in 25mL of N,N-dimethylformamide solvent to obtain solution A; weigh 0.16g of benzimidazole, and use ultrasonic to disperse evenly in 25mL of N,N-dimethylformamide solvent. , in N-dimethylformamide solvent to obtain solution B; the ultrasonic power is 400W, and the ultrasonic time is 5 minutes;

[0041] (2) Mix solution A and solution B and stir evenly to obtain mixed solution C; put it in an oil bath and reflux for 12 hours, then wash with N,N-dimethylformamide and dichloromethane respectively, and collect by centrifugation. To obtain a three-dimensional ZI...

Embodiment 8

[0043] Embodiment 8 (the molar ratio of cobalt nitrate and benzimidazole is 1:1, the mass ratio of ZIF-9 (I) and cobalt nitrate is 2:1)

[0044] A preparation method of an electrocatalyst ZIF-9(III) / Co LDH nanosheet composite material, using imidazole metal organic framework ZIF9(I) as a precursor, comprising the following steps:

[0045] (1) Weigh 0.63g of cobalt nitrate hexahydrate, and use ultrasonic to disperse evenly in 25mL of N,N-dimethylformamide solvent to obtain solution A; weigh 0.31g of benzimidazole, and use ultrasonic to disperse evenly in 25mL of N,N-dimethylformamide solvent. , in N-dimethylformamide solvent to obtain solution B; the ultrasonic power is 400W, and the ultrasonic time is 5 minutes;

[0046] (2) Mix solution A and solution B and stir evenly to obtain mixed solution C; put it in an oil bath and reflux for 36 hours, then wash with N,N-dimethylformamide and dichloromethane respectively, and collect by centrifugation. To obtain a three-dimensional ZI...

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Abstract

The invention provides an electrocatalyst ZIF-9 (III) / Co LDH nanosheet composite material and a preparation method thereof, and belongs to the technical field of electrocatalysis. The method comprisesthe following steps: respectively dispersing cobalt salt and benzimidazole into an N, N-dimethylformamide solvent, carrying out reflux reaction for a period of time at a certain temperature, finallycooling to room temperature, and then centrifuging, washing and drying to obtain ZIF-9 (I); mixing ZIF-9 (I) and cobalt salt and dissolving a mixture in a mixed solvent of absolute ethyl alcohol and ultrapure water, performing a reflux reaction, then performing centrifugal separation, washing and drying, and obtaining the ZIF-9 (III) / Co LDH composite material with the nanosheet morphology. According to the method, phase transformation of ZIF-9 and transformation from ZIF-9 to LDH are achieved at the same time, and compared with other composite materials, the method has the advantages that thecost is low, the reaction process is easy to control, and the electrocatalytic activity is more excellent, and the method can be suitable for industrial large-scale production.

Description

technical field [0001] The invention relates to the technical field of electrocatalysts, in particular to an electrocatalyst ZIF-9(III) / Co LDH nanosheet composite material and a preparation method thereof. Background technique [0002] Electrocatalytic water splitting to produce hydrogen is one of the effective ways to solve environmental pollution and energy crisis. The electrocatalytic oxygen evolution reaction can provide protons and electrons for hydrogen production from water splitting, but it involves the transfer of four electrons and four protons, which is difficult to carry out thermodynamically and kinetically, which limits the rate of the entire electrolytic water splitting reaction. The catalyst currently used for the electrocatalytic oxygen evolution reaction (OER) is mainly IrO 2 and RuO 2 However, these precious metals are very rare in nature, making the cost of electrocatalytic water splitting too high. Therefore, there is an urgent need to develop efficie...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J31/22B01J35/10C25B11/06C25B1/04
CPCB01J31/1691B01J31/1815B01J35/0033B01J35/1004B01J2531/845C25B1/04C25B11/04Y02E60/36
Inventor 蔡丹丹陈伟宾吕冬梅苏世标
Owner GUANGXI NORMAL UNIV
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