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Preparation method and application method of cobalt-tellurium diatomic site catalyst

A diatomic and catalyst technology, applied in the field of electrocatalysis, can solve the problems of restricting large-scale application, high cost, and low reserves, and achieve the effect of excellent multifunctional catalytic performance, low cost, and mild conditions

Active Publication Date: 2020-09-15
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Noble metal platinum-based catalysts are currently recognized as excellent electrocatalysts for catalyzing oxygen reduction reaction (ORR) and hydrogen evolution reaction (HER), but their small reserves and high cost severely restrict their large-scale application.

Method used

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  • Preparation method and application method of cobalt-tellurium diatomic site catalyst
  • Preparation method and application method of cobalt-tellurium diatomic site catalyst
  • Preparation method and application method of cobalt-tellurium diatomic site catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] 5.58g Zn(NO 3 ) 2 ·6H 2 O and 0.5 g of Te powder were dissolved in 150 mL of methanol to form solution A. 6.16 g of dimethylimidazole was dissolved in 150 mL of methanol to form clear solution B. Then, slowly pour solution B into solution A. After mixing and stirring at room temperature for 24 h, the precipitate was centrifuged, washed several times with methanol, and then dried at 60 °C to obtain a gray solid powder, which was recorded as Te 1 @ZIF-8.

[0037] The above Te 1 @ZIF-8 was dissolved in 50mL DMF to form solution C, 50mg tetraphenylporphyrin cobalt was dissolved in 50mL DMF to form solution D, then solution D was slowly added to solution C, mixed and stirred at room temperature for etching After 24 h of ion exchange, the precipitate was centrifuged, washed several times with ethanol, and then dried at 60 °C to obtain a beige solid powder, which was denoted as Co 0 -Te 1 @ZIF-8.

[0038] The above Co 0 -Te 1 @ZIF-8 was pyrolyzed at 920°C for 2 hour...

Embodiment 2

[0040] 5.58g Zn(NO 3 ) 2 ·6H 2O and 0.5 g of Te powder were dissolved in 150 mL of methanol to form solution A. 6.16 g of dimethylimidazole was dissolved in 150 mL of methanol to form clear solution B. Then, slowly pour solution B into solution A. After mixing and stirring at room temperature for 24 h, the precipitate was centrifuged, washed several times with methanol, and then dried at 60 °C to obtain a gray solid powder, which was recorded as Te 1 @ZIF-8.

[0041] The above Te 1 @ZIF-8 was dissolved in 50ml DMF to form solution C, 100mg tetraphenylporphyrin cobalt was dissolved in 50ml DMF to form solution D, then solution D was slowly added to solution C, mixed and stirred at room temperature for etching After 24 h of ion exchange, the precipitate was centrifuged, washed several times with ethanol, and then dried at 60 °C to obtain a gray-brown solid powder, which was recorded as Co-Te 1 @ZIF-8.

[0042] The above Co-Te 1 @ZIF-8 was pyrolyzed at 920°C for 2 hours ...

Embodiment 3

[0044] 5.58g Zn(NO 3 ) 2 ·6H 2 O and 1 g of Te powder were dissolved in 150 mL of methanol to form solution A. 6.16 g of dimethylimidazole was dissolved in 150 mL of methanol to form clear solution B. Then, slowly pour solution B into solution A. After mixing and stirring at room temperature for 24 h, the precipitate was centrifuged, washed several times with methanol, and then dried at 60 °C to obtain a gray solid powder, which was recorded as Te 2 @ZIF-8.

[0045] The above Te 2 @ZIF-8 was dissolved in 50ml DMF to form solution C, 100mg tetraphenylporphyrin cobalt was dissolved in 50ml DMF to form solution D, then solution D was slowly added to solution C, mixed and stirred at room temperature for etching After 24 h of ion exchange, the precipitate was centrifuged, washed several times with ethanol, and then dried at 60 °C to obtain a gray-brown solid powder, which was recorded as Co-Te 2 @ZIF-8.

[0046] The above Co-Te 2 @ZIF-8 was pyrolyzed at 920°C for 2 hours i...

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Abstract

The invention relates to a preparation method and an application method of a cobalt-tellurium diatomic site catalyst. The method comprises the following steps: preparing the catalyst by adopting a space confinement-etching-pyrolysis strategy, and comprises the following three steps: (1) packaging and anchoring a Te precursor by using a molecular pore channel of a metal organic framework material (ZIF-8) as a cage so as to realize uniform space distribution of the Te precursor; (2) performing etching and ion exchange on the frame material by using a metal precursor to realize atomic dispersionof the metal precursor; (3) treating and removing the ligand by using a high-temperature pyrolysis method, carbonizing, stabilizing Co and Te atoms by using a derived carbon-nitrogen framework material, and preventing the Co and Te atoms from migration and agglomeration so as to realize the synthesis of the Co / Te diatomic site catalyst, wherein the precursor is Te powder and cobalt acetylacetonate / cobalt tetraphenylporphyrin / vitamin B12 / cobalt nitrate. The method is simple in process, the preparation method is simple, conditions are mild, the obtained Co / Te diatomic site catalyst has a rich micro / mesoporous structure, the specific surface area is larger than 1000 m < 2 > / g, active sites are in atomic dispersion, excellent electro-catalytic hydrogen production and oxygen reduction performance can be shown, and the cobalt-tellurium diatomic site catalyst can be used as an efficient electrolysis (sea) water and metal-air battery catalyst.

Description

technical field [0001] The invention belongs to the technical field of electrocatalysis, and relates to a preparation method of a cobalt-tellurium double-atom site catalyst and its application in electrolyzed water for hydrogen production and oxygen reduction reaction. Background technique [0002] Electrochemical oxygen reduction reaction (ORR) and hydrogen evolution reaction (HER) are two key components in fuel cells, water splitting, and metal-air batteries. Exploring high-efficiency and low-cost electrocatalysts for promoting ORR and HER reaction kinetics to improve their efficiency has important application prospects for renewable energy technologies. Noble metal platinum-based catalysts are currently recognized as excellent electrocatalysts for catalyzing oxygen reduction reaction (ORR) and hydrogen evolution reaction (HER), but their small reserves and high cost severely restrict their large-scale application. In recent years, transition metal (Fe, Co, Ni, Mo, and W)...

Claims

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Application Information

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IPC IPC(8): B01J27/057B01J27/24B01J35/00B01J35/10B01J37/08C25B1/04C25B11/04
CPCB01J37/086B01J27/0576B01J27/24C25B1/04B01J35/33B01J35/60B01J35/618Y02E60/36Y02E60/50
Inventor 潘原王敏敏刘宾柴永明柳云骐刘晨光
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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