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Fe-Co-S nanosheet material and preparation method thereof and application

A technology of fe-co-s and nanosheets, applied in nanotechnology, nanotechnology, nanotechnology for materials and surface science, etc., can solve the problems of rate performance limitation, low conductivity, etc., and achieve high energy density and Power density, simple preparation method, and good electrochemical performance

Active Publication Date: 2020-02-18
SHANGHAI INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Despite the many advantages of binary transition metal sulfides, their electrical conductivity and low rate performance during fast charge and discharge still limit their potential applications.

Method used

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  • Fe-Co-S nanosheet material and preparation method thereof and application
  • Fe-Co-S nanosheet material and preparation method thereof and application
  • Fe-Co-S nanosheet material and preparation method thereof and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] A preparation method of Fe-Co-S nanosheet material, comprising the following steps:

[0034] 2mmol Co(NO 3 ) 2 ·6H 2 O, 0.8mmol Fe(NO 3 ) 3 9H 2 O, 8mmol NH 4 F. Dissolve 4mmol of urea in 40mL of water, stir evenly with magnetic force, add 0.1g of thiourea to it and quickly transfer to 80mL polytetrafluoroethylene-lined stainless steel autoclave for one-step hydrothermal reaction, the temperature of hydrothermal reaction is 120℃ , The hydrothermal reaction time is 8h; the sample after hydroheating is taken out and cooled, then centrifuged, washed, and vacuum-dried at 60°C for 12h to obtain a powder. After the active material is ground, it is evenly mixed with carbon black and polytetrafluoroethylene in a mass ratio of 8:1:1, pressed onto a nickel foam sheet (1cm×1cm), and dried in an oven at 60°C for 12h to obtain Fe-Co-S working electrode (note FCS-1).

[0035]Jing Chenhua CHI760e electrochemical workstation adopts the method of cyclic voltammetry and constant ...

Embodiment 2

[0045] A preparation method of Fe-Co-S nanosheet material, comprising the following steps:

[0046] 2mmol Co(NO 3 ) 2 ·6H 2 O, 1mmol Fe(NO 3 ) 3 9H 2 O, 8mmol NH 4 F. Dissolve 4mmol of urea in 40mL of water, stir evenly with magnetic force, add 0.5g of thiourea to it and quickly transfer to 80mL polytetrafluoroethylene-lined stainless steel autoclave for one-step hydrothermal reaction, the temperature of hydrothermal reaction is 120℃ , The hydrothermal reaction time is 8h; the sample after hydroheating is taken out and cooled, then centrifuged, washed, and vacuum-dried at 60°C for 12h to obtain a powder. After the active material is ground, it is evenly mixed with carbon black and polytetrafluoroethylene in a mass ratio of 8:1:1, pressed onto a nickel foam sheet (1cm×1cm), and dried in an oven at 60°C for 12h to obtain Fe-Co-S working electrode (note FCS-2).

[0047] Jingchenhua CHI760e electrochemical workstation adopts cyclic voltammetry and constant current charge a...

Embodiment 3

[0052] A preparation method of Fe-Co-S nanosheet material, comprising the following steps:

[0053] 2mmol Co(NO 3 ) 2 ·6H 2 O, 1mmol Fe(NO 3 ) 3 9H 2 O, 8mmol NH 4 F. Dissolve 4mmol of urea in 40mL of water, stir evenly with magnetic force, add 0.5g of thiourea to it and quickly transfer to 80mL polytetrafluoroethylene-lined stainless steel autoclave for one-step hydrothermal reaction, the temperature of hydrothermal reaction is 140℃ , The hydrothermal reaction time is 8h; the sample after hydroheating is taken out and cooled, then centrifuged, washed, and vacuum-dried at 60°C for 12h to obtain a powder. After the active material is ground, it is evenly mixed with carbon black and polytetrafluoroethylene in a mass ratio of 8:1:1, pressed onto a nickel foam sheet (1cm×1cm), and dried in an oven at 60°C for 12h to obtain Fe-Co-S working electrode (note FCS-3).

[0054] Jingchenhua CHI760e electrochemical workstation adopts cyclic voltammetry and constant current charge a...

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Abstract

The invention relates to a Fe-Co-S nanosheet material and a preparation method thereof and application. The preparation method comprises steps: S1, soluble cobalt salt, soluble iron salt, urea and ammonium fluoride are dissolved in water, thiourea is added after even stirring, and a hydrothermal reaction is conducted; and S2, after the hydrothermal reaction is finished, cooling, centrifuging, washing and drying are carried out to obtain the Fe-Co-S nanosheet material. Compared with the prior art, the Fe-Co-S nanosheet material is synthesized through one-step hydrothermal synthesis, the material has a porous nano structure with a high effective specific surface area, more electrochemical active sites and a rapid ion transport path can be provided, the preparation method of the material is simple and environmentally friendly, the synthesis time is greatly shortened, and large-scale production of Fe-Co-S nanosheet materials is facilitated.

Description

technical field [0001] The invention relates to the technical field of electrochemistry and nanometer materials, in particular to a Fe-Co-S nanosheet material and its preparation method and application. Background technique [0002] Growing concerns about global environmental issues and the depletion of fossil energy resources have prompted intensive research into renewable energy forms and energy storage devices. Supercapacitors (SCs), with their unique characteristics of fast charging and discharging, long cycle life, and high power density, have received extensive research interest as ideal energy storage systems for electric vehicles and portable electronic devices. Among different supercapacitors, pseudocapacitors release higher capacitance than electrochemical double-layer capacitors (EDLCs) through fast and reversible surface faradaic redox reactions on electrodes, which has great potential for the development of supercapacitors with high energy storage . Nowadays, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G11/24H01G11/30H01G11/86B82Y30/00B82Y40/00
CPCH01G11/24H01G11/30H01G11/86B82Y30/00B82Y40/00Y02E60/13
Inventor 韩生胡晓敏丛海山王露露马健刘顺昌孙瑶馨蒋继波陈宇凯
Owner SHANGHAI INST OF TECH
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