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Preparation and application of cobalt and nitrogen co-doped porous carbon microsphere material

A technology of co-doping and porous carbon, which is applied in electrical components, battery electrodes, circuits, etc., can solve the problems of poor cycle stability, poor methanol tolerance, high price, and limited fuel cells, so as to facilitate material diffusion and electronic The effect of low transmission and preparation cost and simple and easy preparation method

Active Publication Date: 2017-11-24
HANGZHOU INST OF ADVANCED MATERIAL BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Fuel cells are limited by their own cost and have not been used on a large scale at present, mainly because their electrocatalysts are still platinum-based noble metal catalysts, which are expensive and have poor cycle stability and methanol tolerance.

Method used

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  • Preparation and application of cobalt and nitrogen co-doped porous carbon microsphere material
  • Preparation and application of cobalt and nitrogen co-doped porous carbon microsphere material
  • Preparation and application of cobalt and nitrogen co-doped porous carbon microsphere material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Prepare 1wt% sodium alginate aqueous solution, and add it into the syringe, use 3wt% cobalt nitrate aqueous solution as the receiving solution, in the environment where the output voltage of the high-voltage power supply is 25KV, the distance between the needle and the receiving device is 10cm, and the flow rate is 2mL / h The gel microspheres were obtained by electrospinning by electrospinning machine under the condition. After standing for 12 h, the microspheres were washed twice with absolute ethanol and deionized water, respectively. Put the above microspheres into a freeze dryer to freeze-dry to obtain cobalt alginate microspheres;

[0025] The above microspheres were placed in a 0.15 mol / L methanol solution of 2-methylimidazole and stirred at room temperature for 12 hours, washed several times with absolute ethanol and deionized water, and then freeze-dried to obtain cobalt alginate / ZIF-67 gas gel;

[0026] The cobalt alginate / ZIF-67 airgel was raised to 600°C at ...

Embodiment 2

[0028] Prepare 2wt% sodium alginate aqueous solution and add it into the syringe, use 6wt% cobalt nitrate aqueous solution as the receiving liquid, the output voltage of the high-voltage power supply is 15KV, the distance between the needle and the receiving device is 5cm, and the flow rate is 0.5mL / h Under certain conditions, electrospinning was used to electrospray to obtain gel microspheres. After standing for 12 h, the microspheres were washed twice with absolute ethanol and deionized water, respectively. Put the above microspheres into a freeze dryer to freeze-dry to obtain cobalt alginate microspheres;

[0029] The above microspheres were placed in a 0.3 mol / L methanol solution of 2-methylimidazole and stirred at room temperature for 12 hours, washed with absolute ethanol and deionized water for several times, and then freeze-dried to obtain cobalt alginate / ZIF-67 gas gel;

[0030] The cobalt alginate / ZIF-67 airgel was raised to 600°C at a heating rate of 5°C / min in a ...

Embodiment 3

[0032] Prepare 3wt% sodium alginate aqueous solution and add it into the syringe, use 9wt% cobalt nitrate aqueous solution as the receiving liquid, the output voltage of the high-voltage power supply is 30KV, the distance between the needle and the receiving device is 5cm, and the flow rate is 0.5mL / h Under certain conditions, electrospinning was used to electrospray to obtain gel microspheres. After standing for 12 h, the microspheres were washed twice with absolute ethanol and deionized water, respectively. Put the above microspheres into a freeze dryer to freeze-dry to obtain cobalt alginate microspheres;

[0033] The above microspheres were placed in 0.45 mol / L methanol solution of 2-methylimidazole and stirred at room temperature for 12 hours, washed with absolute ethanol and deionized water for several times, and then freeze-dried to obtain cobalt alginate / ZIF-67 gas gel;

[0034] The cobalt alginate / ZIF-67 airgel was raised to 600°C at a heating rate of 5°C / min in a n...

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Abstract

The invention discloses preparation and application of a cobalt and nitrogen co-doped porous carbon microsphere material. The cobalt and nitrogen co-doped porous carbon microsphere material disclosed by the invention is used for the cathodic oxygen reduction reaction electrocatalyst of a fuel cell. Sodium alginate, cobalt-nitrate hexahydrate and 2-methylimidazole are used as the raw materials of the cobalt and nitrogen co-doped porous carbon microsphere material. The preparation method comprises the steps of: preparing hydrogel microspheres from sodium alginate solution through an electronic injection method, taking cobalt nitrate solution as receiving solution, dipping the microspheres for 12 h, so that sufficient ion exchange of cobalt ions and sodium ions is carried out, freezing and drying after respectively washing by using absolute ethyl alcohol and deionized water for two times, then, putting the microspheres in 2-methylimidazole methanol solution to perform room-temperature reaction for 12 h, then, respectively washing by using absolute ethyl alcohol and deionized water for several times, freezing and drying, and carbonizing through a tube furnace to obtain the cobalt and nitrogen co-doped porous carbon microsphere material. Preparation in the invention is simple in process, green and environment-friendly; and furthermore, the prepared carbon microsphere material has good electro-catalytic property, and has important value and meanings in the field of heteroatom doped carbon-based oxygen reduction electrocatalysts.

Description

technical field [0001] The invention belongs to the field of fuel cell electrocatalysis, and in particular relates to the preparation of cobalt-nitrogen co-doped porous carbon microsphere materials. Background technique [0002] As a kind of clean energy, fuel cell has attracted extensive attention due to its advantages of high energy conversion efficiency, no pollution, and wide range of fuel sources. Fuel cells are limited by their own cost and have not been used on a large scale at present, mainly because their electrocatalysts are still platinum-based noble metal catalysts, which are expensive and have poor cycle stability and methanol tolerance. Therefore, the development of low-cost, high-activity and durable non-platinum catalysts is of great significance for reducing the cost of fuel cells and promoting their large-scale application in the energy field. [0003] Electrospray technology is a method of preparing microspheres by adding high voltage to the needle of the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/88H01M4/90
CPCH01M4/88H01M4/9083Y02E60/50
Inventor 马贵平舒金贺聂俊
Owner HANGZHOU INST OF ADVANCED MATERIAL BEIJING UNIV OF CHEM TECH
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