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Zn-doped MnFe2O4@C composite material for supercapacitor and preparation method of Zn-doped MnFe2O4@C composite material

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., to achieve the effect of increasing the contact area, improving the conductivity, and improving the conductivity

Active Publication Date: 2020-11-03
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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  • Zn-doped MnFe2O4@C composite material for supercapacitor and preparation method of Zn-doped MnFe2O4@C composite material
  • Zn-doped MnFe2O4@C composite material for supercapacitor and preparation method of Zn-doped MnFe2O4@C composite material
  • Zn-doped MnFe2O4@C composite material for supercapacitor and preparation method of Zn-doped MnFe2O4@C composite material

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 preparation method of a Zn-doped MnFe2O4@C composite material for a supercapacitor and an application thereof. The method comprises the steps: performing hydrothermal reactionof manganese chloride (MnCl2), ferric chloride (FeCl3) and potassium hydroxide to obtain MnFe2O4, fully mixing MnFe2O4 and zinc nitrate (Zn (NO3) 2) and performing high-temperature calcination undershielding gas to obtain Zn-doped MnFe2O4, compounding the obtained Zn-doped MnFe2O4 and PDA, and then performing high-temperature carbonization under shielding gas to finally obtain the Zn-doped MnFe2O4-C composite material. The particle size of the obtained Zn-doped MnFe2O4@C composite material is nanometer, the Zn-doped MnFe2O4@C composite material has a large specific surface area, the conductivity of MnFe2O4 is effectively improved through Zn doping, and the obtained Zn-doped MnFe2O4@C composite material 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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IPC IPC(8): H01G11/86H01G11/24H01G11/30H01G11/32H01G11/46
CPCH01G11/24H01G11/30H01G11/32H01G11/46H01G11/86Y02E60/13
Inventor 温华辉
Owner 嘉兴嘉卫检测科技有限公司
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