Preparation method of MOF-derived layered double hydroxide electrocatalyst with hollow structure

A hydroxide electric and layered double technology, applied in the direction of organic compound/hydride/coordination complex catalysts, physical/chemical process catalysts, chemical instruments and methods, etc., can solve problems such as instability of precious metal materials

Inactive Publication Date: 2019-04-19
HENAN NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Platinum (Pt) and iridium (Ir)-based materials are currently known to have the highest HER and OER activities, respectively. However, the scarcity and instability of such noble metal materials make them difficult to be introduced into energy conversion and storage on a large scale. in application

Method used

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  • Preparation method of MOF-derived layered double hydroxide electrocatalyst with hollow structure
  • Preparation method of MOF-derived layered double hydroxide electrocatalyst with hollow structure
  • Preparation method of MOF-derived layered double hydroxide electrocatalyst with hollow structure

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Step S1: Dissolve 2.91g of cobalt nitrate and 3.2g of dimethylimidazole in 200mL of methanol respectively to obtain solution A and solution B, add solution B to solution A and mix well, age the mixed solution at room temperature for 24 hours, centrifuge The precipitate was collected, washed with water and ethanol, and dried at 60°C to obtain ZIF-67, and then ZIF-67 was annealed at 400°C for 2 hours at a heating rate of 1°C / min under a nitrogen atmosphere to obtain ZIF-67-C;

[0020] Step S2: Disperse 12 mg of ZIF-67-C and 24 mg of nickel nitrate hexahydrate in 30 mL of ethanol and conduct a hydrothermal reaction at 120°C for 2 hours, collect the precipitate by centrifugation, wash with water and ethanol and dry at 60°C to obtain C / LDH;

[0021] Step S3: Put 50 mg of sodium hypophosphite and 10 mg of C / LDH in a tube furnace, heat up to 200 °C at a rate of 1 °C / min and anneal for 2 h to finally prepare a layered double hydrogen oxide with a hollow structure derived from MO...

Embodiment 2

[0023] Step S1: Dissolve 2.91g of cobalt nitrate and 3.2g of dimethylimidazole in 200mL of methanol respectively to obtain solution A and solution B, add solution B to solution A and mix well, age the mixed solution at room temperature for 24 hours, centrifuge The precipitate was collected, washed with water and ethanol, and dried at 60°C to obtain ZIF-67, and then ZIF-67 was annealed at 400°C for 2 hours at a heating rate of 1°C / min under a nitrogen atmosphere to obtain ZIF-67-C;

[0024] Step S2: Disperse 12 mg of ZIF-67-C and 24 mg of nickel nitrate hexahydrate in 30 mL of ethanol and conduct a hydrothermal reaction at 120°C for 2 hours, collect the precipitate by centrifugation, wash with water and ethanol and dry at 60°C to obtain C / LDH;

[0025] Step S3: Put 100mg sodium hypophosphite and 10mg C / LDH in a tube furnace, heat up to 200°C at a rate of 1°C / min and anneal for 2 hours to finally prepare a layered double hydroxide derived from MOF with a hollow structure electro...

Embodiment 3

[0027] Step S1: Dissolve 2.91g of cobalt nitrate and 3.2g of dimethylimidazole in 200mL of methanol respectively to obtain solution A and solution B, add solution B to solution A and mix well, age the mixed solution at room temperature for 24 hours, centrifuge The precipitate was collected, washed with water and ethanol, and dried at 60°C to obtain ZIF-67, and then ZIF-67 was annealed at 400°C for 2 hours at a heating rate of 1°C / min under a nitrogen atmosphere to obtain ZIF-67-C;

[0028] Step S2: Disperse 12 mg of ZIF-67-C and 24 mg of nickel nitrate hexahydrate in 30 mL of ethanol and conduct a hydrothermal reaction at 120°C for 2 hours, collect the precipitate by centrifugation, wash with water and ethanol and dry at 60°C to obtain C / LDH;

[0029] Step S3: Put 150mg sodium hypophosphite and 10mg C / LDH in a tube furnace, heat up to 200°C at a rate of 1°C / min and anneal for 2 hours to finally prepare a layered double hydroxide derived from MOF with a hollow structure electro...

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Abstract

The invention discloses a preparation method of a MOF-derived layered double hydroxide electrocatalyst with a hollow structure, and belongs to the technical field of synthesis of new energy electrocatalysts. According to the technical scheme, the electrocatalyst is characterized in that the MOF-derived electrocatalyst prepared under the condition that the mass of a phosphorus source sodium hypophosphite is 150 mg, and the pyrolysis temperature is 200 DEG C has the optimal performance, through further characterization research, self-template in-situ pseudocrystals of MOF are transformed into ahollow skeleton structure with the surface rich in layered double hydroxide, and compared with most phosphides, the MOF-derived electroactive material obtained by using the preparation method shows adesired porous structure and is rich in oxidation-reduction chemical activity and excellent in electrical conductivity.

Description

technical field [0001] The invention belongs to the technical field of synthesis of new energy electrocatalysts, and in particular relates to a method for preparing a layered double hydroxide electrocatalyst derived from MOF with a hollow structure. Background technique [0002] With the rapid development of the economy, the consumption of traditional fossil fuels (oil, natural gas and coal, etc.) is increasing, making these non-renewable resources on the verge of depletion and accompanied by a series of environmental pollution problems. Among the new energy sources that have been developed, hydrogen energy has attracted widespread attention from all walks of life due to its advantages such as high combustion calorific value, wide range of sources, and environmental friendliness. Hydrogen production and oxygen evolution by electrolysis of water is considered to be an ideal method for producing high-purity hydrogen. The reactant is water, and the products are oxygen and hydro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25B1/04C25B11/06B01J31/22
CPCB01J31/1815B01J35/0033B01J2531/845C25B1/04C25B11/04Y02E60/36
Inventor 孙剑辉吴宇涵孙靖宇禹崇菲董淑英
Owner HENAN NORMAL UNIV
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