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NiFe-LDH/Co-CNTs nano composite material and preparation method and application thereof

A nanocomposite material and nanomaterial technology, applied in the field of NiFe-LDH/Co-CNTs nanocomposite material and its preparation, can solve the problems of insufficient zinc-air battery performance, high bifunctional activity, etc., and achieve high energy conversion efficiency and cycle Stability, high bifunctional activity, effect of increasing power density

Active Publication Date: 2021-07-13
ZHEJIANG NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the integrated electrode materials currently prepared cannot have high bifunctional activity, and the performance of the assembled Zn-air battery is insufficient.
The preparation of integrated air electrode materials with high bifunctional activity, high power density, and high stability for Zn-air batteries by a facile method has not been reported yet.

Method used

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  • NiFe-LDH/Co-CNTs nano composite material and preparation method and application thereof
  • NiFe-LDH/Co-CNTs nano composite material and preparation method and application thereof
  • NiFe-LDH/Co-CNTs nano composite material and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] (1) Treatment of carbon cloth (CC)

[0040] Immerse the carbon cloth in acetone solution and ultrasonicate it for 15 minutes, wash it several times with absolute ethanol and deionized water after the ultrasonic treatment, and then immerse the carbon cloth in concentrated nitric acid (HNO 3 ), stirred in a water bath at 60°C for 2 hours, and finally washed several times with absolute ethanol and deionized water, and set aside.

[0041] (2) Preparation of Co-ZIF / CC

[0042] 0.582g cobalt nitrate (Co(NO 3 ) 2 ·6H 2 O) Dissolve in 40mL of deionized water, pour it into 40mL of deionized water in which 1.32g 2-methylimidazole (2-MIM) has been dissolved, and after ultrasonic mixing at room temperature, the treated carbon cloth (CC) Add it into the formed purple solution, and age it for 4 hours after being fully submerged. Take out the carbon cloth with Co-ZIF grown on it, rinse it with deionized water several times, and dry it at 80°C for 6 hours.

[0043] (3) Preparation...

Embodiment 2

[0056] (1) Treatment of carbon cloth (CC)

[0057] Immerse the carbon cloth in acetone solution and ultrasonicate it for 15 minutes, wash it several times with absolute ethanol and deionized water after the ultrasonic treatment, and then immerse the carbon cloth in concentrated nitric acid (HNO 3 ), stirred in a water bath at 60°C for 2 hours, and finally washed several times with absolute ethanol and deionized water, and set aside.

[0058] (2) Preparation of Co-ZIF / CC

[0059] 0.582g cobalt nitrate (Co(NO 3 ) 2 ·6H 2 O) Dissolve in 40mL of deionized water, pour it into 40mL of deionized water in which 1.32g 2-methylimidazole (2-MIM) has been dissolved, and after ultrasonic mixing at room temperature, the treated carbon cloth (CC) Add it into the formed purple solution, and age it for 4 hours after being fully submerged. Take out the carbon cloth with Co-ZIF grown on it, rinse it with deionized water several times, and dry it at 80°C for 6 hours.

[0060] (3) Preparation...

Embodiment 3

[0065] (1) Treatment of carbon cloth (CC)

[0066] Immerse the carbon cloth in acetone solution and ultrasonicate it for 15 minutes, wash it several times with absolute ethanol and deionized water after the ultrasonic treatment, and then immerse the carbon cloth in concentrated nitric acid (HNO 3 ), stirred in a water bath at 60°C for 2 hours, and finally washed several times with absolute ethanol and deionized water, and set aside.

[0067] (2) Preparation of Co-ZIF / CC

[0068] 0.582g cobalt nitrate (Co(NO 3 ) 2 ·6H 2 O) Dissolve in 40mL of deionized water, pour it into 40mL of deionized water in which 1.32g 2-methylimidazole (2-MIM) has been dissolved, and after ultrasonic mixing at room temperature, the treated carbon cloth (CC) Add it into the formed purple solution, and age it for 4 hours after being fully submerged. Take out the carbon cloth with Co-ZIF grown on it, rinse it with deionized water several times, and dry it at 80°C for 6 hours.

[0069] (3) Preparation...

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Abstract

The invention relates to the technical field of preparation of air electrode materials of rechargeable zinc-air batteries, in particular to a NiFe-LDH / Co-CNTs nanocomposite and a preparation method and application thereof. The method comprises the following steps: taking cobalt salt and 2-methylimidazole as reaction raw materials, taking carbon cloth as a substrate, growing to obtain a Co-ZIF nanosheet, and carbonizing to obtain a Co-CNTs / CC nano material; and then carrying out a hydrothermal reaction in a nickel salt and iron salt mixed solution, and obtaining the NiFe-LDH / Co-CNTs nano composite material with the surfaces of the Co-CNTs wrapped with NiFe-LDH. The material has high bifunctional activity, high power density and high stability; when the material is applied to a rechargeable zinc-air battery, the power density is 194mWcm <-2 >, the material has relatively high energy conversion efficiency and cycling stability, and when the material is used as an integrated air electrode for assembling a flexible zinc-air battery, the maximum power density of 142mWcm <-2> is achieved.

Description

technical field [0001] The invention relates to the technical field of preparation of air electrode materials for rechargeable zinc-air batteries, in particular to a NiFe-LDH / Co-CNTs nanocomposite material and its preparation method and application. Background technique [0002] Zinc-air batteries have high energy density, low-cost zinc anodes, and environmental protection. The active material of the cathode comes from air, which has a good application prospect. However, the rechargeability of zinc-air batteries is poor, and it is still a huge challenge to realize practical applications. . As the core component of zinc-air batteries, air electrodes not only determine the kinetic performance of zinc-air batteries, but also play an important role in the charge-discharge efficiency and cycle life of zinc-air batteries. Therefore, the study of efficient and durable air electrode materials has great social and economic significance for the practical application of high-performan...

Claims

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Application Information

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IPC IPC(8): H01M4/88H01M4/90H01M12/08
CPCH01M4/9041H01M4/9083H01M4/88H01M12/08Y02E60/10
Inventor 徐竹莹胡勇沈峻岭
Owner ZHEJIANG NORMAL UNIVERSITY
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