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Acid-modified ultrathin metal organic framework nanosheet catalyst as well as preparation method and application thereof

An ultra-thin metal and organic framework technology, applied in electrolytic components, electrodes, electrolytic processes, etc., can solve the problems of poor electrocatalytic performance, insufficient stability, and instability, and achieve good catalytic stability, low cost, and low cost. The effect of high utilization

Active Publication Date: 2022-07-01
QUZHOU RES INST OF ZHEJIANG UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] Aiming at the defects of poor electrocatalytic performance and insufficient stability of catalysts based on MOF materials in the prior art, the present invention provides a method for preparing acid-modified ultra-thin metal-organic framework nanosheet catalysts. Stable characteristics, obtaining electrocatalysts with excellent catalytic activity and stability, which are even better than the currently recognized noble metal catalysts with good OER performance

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  • Acid-modified ultrathin metal organic framework nanosheet catalyst as well as preparation method and application thereof
  • Acid-modified ultrathin metal organic framework nanosheet catalyst as well as preparation method and application thereof
  • Acid-modified ultrathin metal organic framework nanosheet catalyst as well as preparation method and application thereof

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Experimental program
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Effect test

Embodiment 1

[0048] 216.2 mg of 2,6-naphthalenedicarboxylic acid was added to a mixed solution of N,N-dimethylformamide, absolute ethanol and deionized water (32 mL: 2 mL: 2 mL), followed by adding 190.2 mg of hexanaphthene to the above solution. Nickel chloride in water, 1.0 mL of triethylamine was added rapidly at the same time, and magnetic stirring was performed for 10 min. Then, the above mixed solution was transferred to an ultrasonic crusher, and the intensity of 400W was used for ultrasonic peeling for 300min. After the peeling was completed, it was washed several times with absolute ethanol, and the solid samples were separated with a high-speed centrifuge at 10000r / s. The solid sample was then added to 1 mmol L -1 In acetic acid, treated with acid for 1 h, washed several times with absolute ethanol after peeling, and separated the solid sample with a high-speed centrifuge at 10,000 r / s, and finally dried the sample in vacuum at room temperature for 12 h.

Embodiment 2

[0050] 216.2 mg of 2,6-naphthalenedicarboxylic acid was added to a mixed solution of N,N-dimethylformamide, absolute ethanol and deionized water (32 mL: 2 mL: 2 mL), followed by adding 190.2 mg of hexanaphthene to the above solution. Nickel chloride in water, 1.0 mL of triethylamine was added rapidly at the same time, and magnetic stirring was performed for 10 min. Then, the above mixed solution was transferred to an ultrasonic crusher, and the intensity of 400W was used for ultrasonic peeling for 300min. After the peeling was completed, it was washed several times with absolute ethanol, and the solid samples were separated with a high-speed centrifuge at 10000r / s. The solid sample was then added to 0.5 mmol L -1 In acetic acid, treated with acid for 1 h, washed several times with absolute ethanol after peeling, and separated the solid sample with a high-speed centrifuge at 10,000 r / s, and finally dried the sample in vacuum at room temperature for 12 h.

Embodiment 3

[0052] 216.2 mg of 2,6-naphthalenedicarboxylic acid was added to a mixed solution of N,N-dimethylformamide, absolute ethanol and deionized water (32 mL: 2 mL: 2 mL), followed by adding 190.2 mg of hexanaphthene to the above solution. Nickel chloride in water, 1.0 mL of triethylamine was added rapidly at the same time, and magnetic stirring was performed for 10 min. Then, the above mixed solution was transferred to an ultrasonic crusher, and the intensity of 400W was used for ultrasonic peeling for 300min. After the peeling was completed, it was washed several times with absolute ethanol, and the solid samples were separated with a high-speed centrifuge at 10000r / s. The solid sample was then added to 1.5 mmol L -1 In acetic acid, treated with acid for 1 h, washed several times with absolute ethanol after peeling, and separated the solid sample with a high-speed centrifuge at 10,000 r / s, and finally dried the sample in vacuum at room temperature for 12 h.

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Abstract

The invention discloses an acid-modified ultrathin metal organic framework nanosheet catalyst as well as a preparation method and application thereof. The preparation method comprises the following steps: step 1, dissolving 2, 6-naphthalic acid, adding cobalt salt and an acid-binding agent into the 2, 6-naphthalic acid, carrying out a stirring reaction to obtain a dispersion liquid of MOF, carrying out ultrasonic stripping on the dispersion liquid, and washing and separating a product to obtain nanosheets; and step 2, placing the nanosheets in an acid solution for acid treatment, and then washing, separating and drying to obtain the nanosheets. According to the method, the characteristic that the MOF material is unstable in an acid environment is utilized, acid treatment is used for inducing the MOF material to generate bond length change, so that the energy band position and the electronic structure of an acid treatment catalyst are changed, the oxygen evolution energy potential barrier is reduced, the efficient electrochemical water evolution oxygen evolution reaction can be realized in the optimal range of the acid liquor concentration and the acid pickling time, and the catalytic effect is better.

Description

technical field [0001] The invention relates to the technical field of energy material synthesis, in particular to an acid-modified ultrathin metal-organic framework nanosheet catalyst and a preparation method and application thereof. Background technique [0002] Metal-organic frameworks (MOFs), which are compounds with uniform pores and periodic structural units formed by the coordination of metal atomic nodes and organic ligands, have been a hot research topic in recent years. A class of catalysts with great development prospects, and its regular internal structure makes it easier to control its electronic structure, and is often used to modify the fine structure to study the mechanism of the catalytic process. [0003] Not only that, the application of metal-organic framework catalysts to the field of electrochemical catalytic water splitting can not only effectively alleviate the increasingly difficult energy problems, but also create more catalytically active catalysts...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G83/00C25B1/04C25B11/048
CPCC08G83/008C25B1/04C25B11/048Y02E60/36
Inventor 侯阳何凡杨彬雷乐成李中坚
Owner QUZHOU RES INST OF ZHEJIANG UNIV
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