A kind of zn-doped mnfe2o4@c composite material for supercapacitor and preparation method thereof

A composite material, mnfe2o4 technology, applied in the field of supercapacitor electrode material preparation, can solve the problems of low electrochemical activity, low conductivity, etc., and achieve the effect of increasing the contact area, improving the conductivity, and increasing the surface area

Active Publication Date: 2021-10-29
嘉兴嘉卫检测科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

MnFe 2 o 4 As a transition metal oxide, it has the advantages of high theoretical capacity, environmental friendliness and low cost, but it needs to solve the problems of low conductivity and low electrochemical activity if it wants to be applied as a supercapacitor electrode material.

Method used

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  • A kind of zn-doped mnfe2o4@c composite material for supercapacitor and preparation method thereof
  • A kind of zn-doped mnfe2o4@c composite material for supercapacitor and preparation method thereof
  • A kind of zn-doped mnfe2o4@c composite material for supercapacitor and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] (1)MnFe 2 o 4 Preparation: Weigh 3.5mmol manganese chloride (MnCl 2 ), 7mmol ferric chloride (FeCl 3 ), 0.3gNH 4 F and 0.3 urea dissolved in 50mLH 2 O, then slowly add 0.1mol / L KOH solution to adjust the pH to 13, stir for 30 minutes, then move the mixture to a stainless steel autoclave with a polytetrafluoroethylene liner, conduct a hydrothermal reaction at 160°C for 12 hours, and wait to cool to room temperature The product was centrifuged and washed with deionized water, and dried in an oven at 70°C for 12 hours to obtain MnFe 2 o 4 .

[0021] (2) Zn-doped MnFe 2 o 4 The preparation: step (1) is made MnFe 2 o 4 and zinc nitrate (Zn(NO 3 ) 2 ) were fully mixed according to the mass ratio of 2:1, and then the mixture was annealed at 200°C for 2h under a hydrogen-argon mixed atmosphere.

[0022] (3) Zn-doped MnFe 2 o 4 The preparation of @PDA: the product that 120mg step (2) makes and 120mg dopamine hydrochloride (C 8 h 11 NO 2 HCl) was sequentially ad...

Embodiment 2

[0026] (1)MnFe 2 o 4 Preparation: Weigh 4mmol manganese chloride (MnCl 2 ), 8mmol ferric chloride (FeCl 3 ), 0.4gNH 4 F and 0.4g urea were dissolved in 50mLH 2 O, then slowly add 0.1mol / L KOH solution to adjust the pH to 13, stir for 30 minutes, then move the mixture to a stainless steel autoclave with a polytetrafluoroethylene liner, conduct a hydrothermal reaction at 170°C for 12 hours, and wait to cool to room temperature The product was centrifuged and washed with deionized water, and dried in an oven at 70°C for 12 hours to obtain MnFe 2 o 4 .

[0027] (2) Zn-doped MnFe 2 o 4 The preparation: step (1) is made MnFe 2 o 4 and zinc nitrate (Zn(NO 3 ) 2 ) were fully mixed according to the mass ratio of 2:1, and then the mixture was annealed at 250°C for 3h under a hydrogen-argon mixed atmosphere.

[0028] (3) Zn-doped MnFe 2 o 4 The preparation of @PDA: the product that 120mg step (2) makes and 120mg dopamine hydrochloride (C 8 h 11 NO 2 HCl) was sequentiall...

Embodiment 3

[0031] (1)MnFe 2 o 4 Preparation: Weigh 5mmol manganese chloride (MnCl 2 ), 10mmol ferric chloride (FeCl 3 ), 0.5gNH 4 F and 0.5g urea were dissolved in 50mLH 2 O, then slowly add 0.1mol / L KOH solution to adjust the pH to 13, stir for 30 minutes, then move the mixture to a stainless steel autoclave with a polytetrafluoroethylene liner, conduct a hydrothermal reaction at 170°C for 16 hours, and wait to cool to room temperature The product was centrifuged and washed with deionized water, and dried in an oven at 70°C for 12 hours to obtain MnFe 2 o 4 .

[0032] (2) Zn-doped MnFe 2 o 4 The preparation: step (1) is made MnFe 2 o 4 and zinc nitrate (Zn(NO 3 ) 2 ) were fully mixed according to the mass ratio of 2:1, and then the mixture was annealed at 270°C for 1.5h under a hydrogen-argon mixed atmosphere.

[0033] (3) Zn-doped MnFe 2 o 4 The preparation of @PDA: the product that 120mg step (2) makes and 120mg dopamine hydrochloride (C 8 h 11 NO 2 HCl) was sequenti...

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Abstract

The invention provides a Zn-doped MnFe for supercapacitor 2 o 4 Preparation methods and applications of @C composite materials. Manganese chloride (MnCl 2 ), ferric chloride (FeCl 3 ), potassium hydroxide hydrothermal reaction to obtain MnFe 2 o 4 , the MnFe 2 o 4 and zinc nitrate (Zn(NO 3 ) 2 ) are fully mixed and calcined at high temperature under protective gas to obtain Zn-doped MnFe 2 o 4 , the resulting Zn-doped MnFe 2 o 4 After compounding with PDA, Zn-doped MnFe was finally obtained by high-temperature carbonization under protective gas 2 o 4 @C Composite. The resulting Zn-doped MnFe 2 o 4 The particle size of the @C composite material is nano-sized and has a large specific surface area, and Zn doping effectively improves the MnFe 2 o 4 Electrical conductivity, the resulting Zn-doped MnFe 2 o 4 The @C composite has excellent electrochemical performance.

Description

technical field [0001] The invention belongs to the field of preparation of electrode materials for supercapacitors, in particular to a Zn-doped MnFe for supercapacitors 2 o 4 Preparation method of @C composite material. Background technique [0002] Supercapacitor refers to a new type of energy storage device between traditional capacitors and rechargeable batteries. It not only has the characteristics of fast charging and discharging of capacitors, but also has the characteristics of energy storage of batteries. It is a new generation of high-efficiency energy storage devices. Electrode materials are crucial to the development of supercapacitors. As an important electrode material, transition metal oxides have been widely studied because of their abundant resource reserves and easy preparation. MnFe 2 o 4 As a transition metal oxide, it has the advantages of high theoretical capacity, environmental friendliness and low cost, but it needs to solve the problems of low c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01G11/86H01G11/24H01G11/30H01G11/32H01G11/46
CPCH01G11/24H01G11/30H01G11/32H01G11/46H01G11/86Y02E60/13
Inventor 董梁徐钦良王佳温华辉
Owner 嘉兴嘉卫检测科技有限公司
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