An electrocatalyst zif-9(iii)/co LDH nanosheet composite material and preparation method thereof

A technology of ZIF-9 and electrocatalyst, which is applied in chemical instruments and methods, physical/chemical process catalysts, organic compound/hydride/coordination complex catalysts, etc., can solve the problems of poor dispersion of composite materials, high temperature and high pressure, and price Expensive and other issues, to achieve the effect of improving wettability, improving conductivity, and low cost

Active Publication Date: 2021-06-25
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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  • An electrocatalyst zif-9(iii)/co LDH nanosheet composite material and preparation method thereof
  • An electrocatalyst zif-9(iii)/co LDH nanosheet composite material and preparation method thereof
  • An 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, belonging to the technical field of electrocatalysis. The method comprises the following steps: respectively dispersing cobalt salt and benzimidazole in N,N-dimethylformamide solvent, reflux reaction at a certain temperature for a period of time, and finally cooling to room temperature, then centrifuging, washing and drying to obtain ZIF ‑9(I); ZIF‑9(I) and cobalt salt are mixed and dissolved in a mixed solvent of absolute ethanol and ultrapure water, reflux reaction, and then centrifuged, washed and dried to obtain ZIF‑9 with nanosheet morphology (III) / Co LDH composites. The method of the present invention realizes the phase transformation of ZIF-9 and the conversion of ZIF-9 to LDH at the same time. Compared with other composite materials, it has the advantages of low cost, easy control of the reaction process and superior electrocatalytic activity, etc., and can be applied to large-scale industrial applications. mass 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 Patents(China)
IPC IPC(8): B01J31/22B01J35/10C25B11/095C25B1/04
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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