Preparation method of nickel-cobalt layered bimetallic hydroxide/graphene electrocatalyst

A layered bimetallic and hydroxide technology, applied in the direction of metal/metal oxide/metal hydroxide catalyst, catalyst activation/preparation, physical/chemical process catalyst, etc. Simple chemistry and synthesis method, large specific surface area effect

Active Publication Date: 2018-03-23
GUANGXI NORMAL UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The object of the invention of the present invention is: for the above-mentioned existing problems, provide the preparation method of nickel-cobalt layered double metal hydroxide / graphene electrocatalyst, the method of the present invention has overcome existing synthetic method equipment requirement high, needs high temperature and high pressure, The disadvantage of requiring expensive surfactants, compared with the prior art, has the advantages of simple process, low cost, and easy control of the reaction process, and is suitable for large-scale industrial production

Method used

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  • Preparation method of nickel-cobalt layered bimetallic hydroxide/graphene electrocatalyst
  • Preparation method of nickel-cobalt layered bimetallic hydroxide/graphene electrocatalyst
  • Preparation method of nickel-cobalt layered bimetallic hydroxide/graphene electrocatalyst

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Embodiment 1

[0028] Embodiment 1 (according to cobalt nitrate: graphene weight ratio is 174:1; The mol ratio of cobalt nitrate and dimethylimidazole is 1:2, and ZIF-67 / G composite material and nickel nitrate mass ratio are 3:1)

[0029] The preparation method of nickel-cobalt layered double metal hydroxide / graphene electrocatalyst uses imidazole metal organic framework ZIF-67 as a precursor, comprising the following steps:

[0030] 1) Weigh 0.01g graphene and 1.74g cobalt nitrate, and disperse the above two substances evenly in 100ml of anhydrous methanol by ultrasonic wave, the power of ultrasonic wave is 150W, and the ultrasonic time is 12 hours to obtain solution A;

[0031] 2) Weigh 3.9398g of dimethylimidazole and dissolve it in 100mL of anhydrous methanol, solution B, according to the molar ratio of cobalt nitrate in solution A and dimethylimidazole in solution B is 1:2, add solution A to solution B After stirring evenly, let it stand for 20 hours, then centrifuge, wash and dry to ob...

Embodiment 2

[0033] Embodiment 2 (according to cobalt nitrate: graphene weight ratio is 174:2; The mol ratio of cobalt nitrate and dimethylimidazole is 1:16, and ZIF-67 / G composite material and nickel nitrate mass ratio are 1:3)

[0034] The preparation method of nickel-cobalt layered double metal hydroxide / graphene electrocatalyst uses imidazole metal organic framework ZIF-67 as a precursor, comprising the following steps:

[0035] 1) Weigh 0.02g of graphene and 1.74g of cobalt nitrate, and uniformly disperse the above two substances in 100ml of anhydrous methanol by ultrasonic waves. The power of the ultrasonic waves is 300W, and the ultrasonic time is 10 hours to obtain solution A;

[0036] 2) Weigh 7.8796g of dimethylimidazole and dissolve it in 100mL of anhydrous methanol, solution B, according to the molar ratio of cobalt nitrate in solution A and dimethylimidazole in solution B is 1:16, add solution A to solution B After stirring evenly, let it stand for 32 hours, then centrifuge, w...

Embodiment 3

[0038] Embodiment 3: (according to cobalt nitrate: graphene weight ratio is 43.5:1; The mol ratio of cobalt nitrate and dimethylimidazole is 1:8, and ZIF-67 / G composite material and nickel nitrate mass ratio are 2:1)

[0039] The preparation method of nickel-cobalt layered double metal hydroxide / graphene electrocatalyst uses imidazole metal organic framework ZIF-67 as a precursor, comprising the following steps:

[0040] 1) Weigh 0.04g graphene and 1.74g cobalt nitrate, and disperse the above two substances evenly in 100ml of anhydrous methanol by ultrasonic wave, the power of ultrasonic wave is 300W, and the ultrasonic time is 8 hours to obtain solution A;

[0041] 2) Weigh 3.9398g of dimethylimidazole and dissolve it in 100mL of anhydrous methanol, solution B, according to the molar ratio of cobalt nitrate in solution A and dimethylimidazole in solution B is 1:8, add solution A to solution B After stirring evenly, let stand for 30 hours, then centrifuge, wash and dry to obta...

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Abstract

The invention provides a preparation method of a nickel-cobalt layered bimetallic hydroxide/graphene electrocatalyst, which belongs to the technical field of electrocatalysts. The method disclosed bythe invention comprises the following steps: graphene and cobalt nitrate are uniformly dispersed in a methanol solvent by ultrasonic waves, so that an ultrasonic solution is obtained; the ultrasonic solution is added into a methanol solution of dimethylimidazole, is uniformly mixed and then is enabled to stand, and centrifuging, washing and drying are then carried out, so that a ZIF-67/graphene composite material is obtained; the ZIF-67/graphene composite material and nickel salt are mixed and dissolved in a solvent, refluxing is carried out for reaction, centrifugal separation is then carriedout, obtained precipitate is washed with absolute ethyl alcohol, and drying is carried out to obtain a NiCo LDH/G composite material with a nanoscale morphology. The method disclosed by the inventionovercomes the defects of high requirement on equipment, need for high temperature and high pressure and need for an expensive surfactant existing in conventional synthesis methods, and compared withthe prior art, the preparation method has the advantages of simple process, low cost, easy reaction process control and the like, and is suitable for industrial mass production.

Description

【Technical field】 [0001] The invention relates to the technical field of electrocatalysts, in particular to a method for preparing nickel-cobalt layered double hydroxide / graphene electrocatalysts. 【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 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 efficient, inexpensi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/755B01J37/03C25B11/06C25B1/04
CPCB01J23/002B01J23/755B01J35/0013B01J35/0033B01J37/038C25B1/04C25B11/091Y02E60/36
Inventor 蔡丹丹张佳慧王长水
Owner GUANGXI NORMAL UNIV
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