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A method for preparing nitrogen-doped porous carbon for supercapacitors using metal-organic framework compounds

A metal-organic framework, supercapacitor technology, applied in hybrid capacitor electrodes, hybrid/electric double-layer capacitor manufacturing, carbon preparation/purification, etc. Electrochemical performance, strong controllability

Active Publication Date: 2022-01-04
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when MOFs are used as precursors, it is impossible to mix with nano-CaCO through simple mechanical mixing. 3 Uniform compounding, thus affecting the nano-CaCO 3 Pore-making effect

Method used

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  • A method for preparing nitrogen-doped porous carbon for supercapacitors using metal-organic framework compounds

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Weigh 200mg of nano-CaCO with a size of 150nm 3 Put it into a beaker filled with 100mL of absolute ethanol and deionized aqueous solution with a volume ratio of 1:1, then add 100mg of tris(hydroxymethyl)aminomethane and 100mg of dopamine hydrochloride, stir at room temperature for 12h, take it out and use deionized Rinse with water until neutral, and freeze-dry to obtain nano-CaCO 3 @PDA particles.

[0027] Take 200mg CaCO 3 Disperse @PDA into 50ml of methanol, add 600mg of PVP and 300mg of zinc nitrate, stir to dissolve, and make solution A. Weigh 900 mg of 2-methylimidazole and disperse it in 50 ml of methanol as solution B. During the stirring process, quickly pour the B solution into the A solution, and let it stand for 2 hours to obtain CaCO 3 @PDA @ZIF-8.

[0028] CaCO 3 @PDA@ZIF-8 was heated to 700 °C for 1 h at a heating rate of 5 °C / min in an argon atmosphere. After cooling to room temperature, the template agent was removed by acid washing with 1 mol / L H...

Embodiment 2

[0030] Weigh 200 mg of nano-CaCO with a size of 50 nm 3 , put into a beaker containing 100mL absolute ethanol and deionized aqueous solution with a volume ratio of 1:1, then add 100mg tris(hydroxymethyl)aminomethane and 100mg dopamine hydrochloride, stir at room temperature for 24h, take it out and use it Rinse with ionized water to neutrality, and freeze-dry to obtain nano-CaCO 3 @PDA particles.

[0031] Take 200mg CaCO 3 Disperse @PDA into 50ml of methanol, add 1g of PVP and 900mg of zinc nitrate, stir to dissolve, and make solution A. Weigh 3.3g of 2-methylimidazole and disperse it in 50ml of methanol as solution B. During the stirring process, quickly pour B solution into A solution and let it stand for 4h to obtain CaCO 3 @PDA @ZIF-8.

[0032] CaCO 3 @PDA@ZIF-8 was heated to 800 °C for 3 h at a heating rate of 5 °C / min in an argon atmosphere. After cooling to room temperature, the template agent was removed by acid washing with 1 mol / L HCl solution to obtain nitrogen...

Embodiment 3

[0034] Weigh 400mg of nano-CaCO with a size of 80nm 3 , put into a beaker containing 100mL absolute ethanol and deionized aqueous solution with a volume ratio of 1:1, then add 100mg tris(hydroxymethyl)aminomethane and 100mg dopamine hydrochloride, stir at room temperature for 18h, take it out and use it Rinse with ionized water to neutrality, and freeze-dry to obtain nano-CaCO 3 @PDA particles.

[0035] Take 200mg CaCO 3Disperse @PDA in 50ml of methanol, add 2g of PVP, 1.2g of zinc nitrate, stir to dissolve, and make solution A. Weigh 4g of 2-methylimidazole and disperse it in 50ml of methanol as solution B. During the stirring process, quickly pour B solution into A solution and let it stand for 12h to obtain CaCO 3 @PDA @ZIF-8.

[0036] CaCO 3 @PDA@ZIF-8 was heated to 900 °C for 1 h at a heating rate of 5 °C / min in an argon atmosphere. After cooling to room temperature, the templating agent was removed by acid washing with 1 mol / L HCl solution to obtain nitrogen-doped p...

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Abstract

The invention discloses a method for preparing nitrogen-doped porous carbon for supercapacitors by using a metal-organic framework compound, which belongs to the field of material preparation. The specific preparation method is as follows: first, the nano-CaCO 3 Disperse @PDA particles into methanol, then add a certain mass of PVP and zinc nitrate to configure solution A. Secondly, dissolve a certain amount of 2-methylimidazole in methanol, configure solution B, quickly introduce solution B into solution A, and let it stand for a period of time to obtain CaCO 3 @PDA @ZIF‑8. Finally, the CaCO 3 @PDA@ZIF‑8 was placed in a tube furnace for high-temperature carbonization to obtain the product. The preparation process of the present invention is highly controllable; the organic framework compound and nano-CaCO 3 It can be uniformly compounded, and the prepared nitrogen-doped porous carbon has adjustable specific surface area, pore structure and surface properties, and has good electrochemical performance.

Description

technical field [0001] The invention relates to a method for preparing nitrogen-doped porous carbon for supercapacitors by using a metal-organic framework compound, and belongs to the technical field of material preparation. Background technique [0002] The energy problem is a difficult problem that human beings have been facing for a long time, and the development of various energy conversion and storage devices is an important means to solve the energy problem. As an electrochemical energy storage device with excellent electrochemical properties and environmental friendliness, supercapacitors have attracted extensive research by scientific and industrial researchers. Electrode materials for supercapacitors mainly include functional carbons, conductive polymers, and metal oxides. Among them, porous carbon has attracted extensive attention from researchers because of its high specific area, good chemical stability, and low cost. Different kinds of precursors, such as biom...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B32/05H01G11/24H01G11/30H01G11/32H01G11/48H01G11/86
CPCH01G11/24H01G11/30H01G11/32H01G11/48H01G11/86C01B32/05Y02E60/13
Inventor 张旭曲宁范秋雨米盼盼杨贺
Owner DALIAN UNIV OF TECH
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