Fully-hydrolyzed amorphous hydroxide material as well as preparation method and application thereof

A hydroxide and hydrolysis technology, which is applied in the field of electrocatalysis, can solve the problems of poor electrocatalytic activity of catalysts and difficulty in realizing dual-functional full hydrolysis, and achieve easy large-scale scale-up and production, excellent electrocatalytic full hydrolysis performance, and high yield high effect

Active Publication Date: 2022-04-29
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The object of the present invention is to provide a kind of amorphous hydroxide material and its preparation method and application, which solves the problem of poor electrocatalytic activity of conventional catalysts and difficulty in realizing dual functions The problem of total hydrolysis

Method used

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  • Fully-hydrolyzed amorphous hydroxide material as well as preparation method and application thereof
  • Fully-hydrolyzed amorphous hydroxide material as well as preparation method and application thereof
  • Fully-hydrolyzed amorphous hydroxide material as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] A preparation method of fully hydrolyzed amorphous hydroxide material, comprising the following steps:

[0050] (1) Weigh 0.5 mmol of crystalline microporous metal-organic framework compound [Ni 3 (bpt) 2 (DMF) 2 (H 2 O) 2 ] 1.5DMF as raw material, dried and pulverized at room temperature, put into a 50mL beaker;

[0051] (2) Weigh 5mmol KOH, add 5mL aqueous solution, and configure pH=14 alkaline reaction solution;

[0052] (3) Add the alkaline reaction solution into the beaker containing the microporous metal-organic framework compound, and let it stand for reaction at room temperature for 30 minutes;

[0053] (4) After the reaction, the precipitate was collected by centrifugation and suction filtration. The precipitate was first washed with 20mL deionized water and suction-filtered 3 times in batches, and then washed with 20mL of absolute ethanol for 3 times and then dried naturally at room temperature. Dry for 3 hours, and the resulting granular solid is the fu...

Embodiment 2

[0055] (1) Weigh 0.5 mmol of crystalline microporous metal-organic framework compound [Fe 3 (bpt) 2 (DMF) 2 (H 2 O) 2 ] 1.5DMF as raw material, dried and pulverized at room temperature, put into a 50mL beaker;

[0056] (2) Weigh 5mmol NaOH, add 5mL aqueous solution, and configure pH=14 alkali reaction solution;

[0057] (3) Add the alkaline reaction solution into the beaker containing the microporous metal-organic framework compound, and let it stand for reaction at room temperature for 30 minutes;

[0058] (4) After the reaction, the precipitate was collected by centrifugation and suction filtration. The precipitate was first washed with 20mL deionized water and suction-filtered 3 times in batches, and then washed with 20mL of absolute ethanol for 3 times. After drying for 3 hours, the resulting granular solid is the fully hydrolyzed amorphous hydroxide material [Fe(OH) 2 (H 2 O) 0.6 ]·H 2 O (abbreviated as a-Fe(OH) 2 ).

Embodiment 3

[0060] (1) Weigh 0.5 mmol of crystalline microporous metal-organic framework compound [Co 3 (bpt) 2 (DMF) 2 (H 2 O) 2 ] 1.5DMF as a raw material, dried at room temperature and put into a 50mL beaker;

[0061] (2) Weigh 2.5mmol KOH, add 25mL aqueous solution, and configure pH=13 alkali reaction solution;

[0062] (3) Add the crystalline microporous metal-organic framework into the beaker containing the microporous metal-organic framework compound, and let it stand for reaction at room temperature for 60 minutes;

[0063] (4) After the reaction, the precipitate was collected by centrifugation and suction filtration. The precipitate was first washed twice with 20 mL of deionized water and filtered twice, and then washed twice with 20 mL of absolute ethanol. After drying for 3 hours, the resulting granular solid is the fully hydrolyzed amorphous hydroxide material [Co(OH) 2 (H 2 O) 0.6 ]·H 2 O (abbreviated as a-Co(OH) 2 ).

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Abstract

The invention belongs to the technical field of electro-catalytic material preparation, and discloses a fully hydrolyzed amorphous hydroxide material with a chemical formula of [M (OH) 2 (H2O) x]. YH2O (M = Ni < 2 + >, Co < 2 + >, Fe < 2 + >; x is equal to 0.5-1; y = 0.5-2), and a single-metal or mixed-metal metal organic framework precursor material [M3 (bpt) 2 (DMF) 2 (H2O) 2]. 1.5 DMF is mildly treated through an alkaline solution one-step method to prepare the metal organic framework. Part of metal ions of the amorphous electrocatalyst are coordinated with water molecules, lattice free water molecules exist at the same time, and a layered non-close packing porous structure is formed, so that the OER and HER electrocatalytic activity is greatly enhanced. A high-value organic ligand in the precursor MOF can be recovered and recycled; the obtained catalyst has good electro-catalysis oxygen evolution and hydrogen evolution performance, and can be directly coated on an electrode to realize full hydrolysis so as to prepare hydrogen.

Description

technical field [0001] The invention belongs to the technical field of electrocatalysis, and in particular relates to a fully hydrolyzed amorphous hydroxide material and its preparation method and application. Background technique [0002] Among the various technological paths for the sustainable conversion and storage of green energy such as solar energy, wind energy, tidal energy, and geothermal energy, the common requirement is to convert intermittent electrical energy into stable chemical energy. The main method is to obtain hydrogen through electrolysis of water, and then provide energy for various Provide green, stable and high energy density energy for various industrial application scenarios. The technical bottleneck of water electrolysis is the catalyst efficiency of hydrogen evolution reaction (HER) and oxygen evolution reaction (OER), especially as a multi-electron transfer process, OER has slow kinetics and high overpotential, resulting in a large amount of energ...

Claims

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Application Information

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IPC IPC(8): C25B1/04C25B11/075C01G49/02C01G51/04C01G53/00C01G53/04
CPCC25B1/04C25B11/075C01G53/006C01G53/04C01G51/04C01G49/02C01P2002/72C01P2002/82C01P2002/88C01P2004/03C01P2004/04Y02E60/36Y02P20/133
Inventor 殷政程瑜马维敏贺昭璇吕雯郁
Owner SHAANXI UNIV OF SCI & TECH
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