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Preparation method and application of one-dimensional manganese dioxide@carbon@nickel hydroxide core-shell nanowire composite material

A composite material and nanowire technology, applied in the field of core-shell nanowire composite materials, can solve the problems of volume change limitation, poor conductivity, etc., and achieve the effect of simple operation, mild conditions and low cost

Active Publication Date: 2019-08-30
ANHUI NORMAL UNIV
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  • Claims
  • Application Information

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Problems solved by technology

However, the poor conductivity and large volume change during charge-discharge greatly limit their performance in terms of rate capability and cycle stability.

Method used

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  • Preparation method and application of one-dimensional manganese dioxide@carbon@nickel hydroxide core-shell nanowire composite material
  • Preparation method and application of one-dimensional manganese dioxide@carbon@nickel hydroxide core-shell nanowire composite material
  • Preparation method and application of one-dimensional manganese dioxide@carbon@nickel hydroxide core-shell nanowire composite material

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preparation example Construction

[0021] The invention provides a one-dimensional MnO 2 @C@Ni(OH) 2 The preparation method of core-shell nanowire composite material, comprising: monomeric MnO 2 Contact reaction of @C nanowires, nickel source, persulfate, and basic compounds in water to prepare one-dimensional MnO 2 @C@Ni(OH) 2 Core-shell nanowire composites.

[0022] In the above preparation method, monomeric MnO 2 The dosage of @C nanowire, nickel source, and persulfate can be selected in a wide range, but in order to make the core-shell nanotube composite material have more excellent electrochemical performance and stability, preferably, the monomer MnO 2 The dosage ratio of @C nanowire, nickel source and persulfate is 15mg: 0.25-0.5mmol: 0.02-0.04mmol;

[0023] In the above preparation method, the amount of water can be selected in a wide range, but in order to fully contact the reactants to improve the reaction rate and yield, preferably, the monomer MnO 2 The dosage ratio of @C nanowires and water ...

preparation example 1

[0035] The monomeric MnO 2 @C nanowires are prepared by the following method: Take 15ml of KMnO 4 Aqueous solution (0.04mol / L) and 15ml of NH 4 Pour the Cl aqueous solution (0.04mol / L) into a 50ml polytetrafluoroethylene stainless steel autoclave, stir it magnetically for 30 minutes, seal it well, and place it in an oven at 180°C for 24 hours. After the reaction, cool to 25°C; take out the product , washed three times with deionized water and absolute ethanol successively to obtain MnO 2 nanowire monomer.

[0036] Take all the MnO obtained above 2 Nanowire monomers and 30ml of glucose solution (0.04mol / L) were placed in a 50ml beaker, stirred magnetically at 25°C for 12h, washed once with deionized water, and dried in a vacuum oven for 24h; finally, at 450°C Anneal in nitrogen for 2 hours, after the reaction is over, gradually cool to 25°C, take out the product, and get MnO 2 @C nanowires, the resulting monomeric MnO 2 @C Nanowire; via figure 1 Monomer MnO 2 The electr...

Embodiment 1

[0038] 0.25mmol nickel sulfate hexahydrate, 0.02mmol potassium persulfate, and 0.15ml concentration of 10% by weight ammonia were dissolved in 160ml deionized water, and then the monomer MnO obtained above 2 @C nanowires (15mg) were added and mixed, stirred evenly, and then the above mixed system was reacted at 15°C for 0.5h, the product was washed with deionized water and absolute ethanol three times, and dried at 60°C.

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Abstract

The invention discloses a preparation method and application of a one-dimensional manganese dioxide@carbon@nickel hydroxide core-shell nanowire composite material. The preparation method comprises thesteps of: subjecting a monomer MnO2@C nanowire, a nickel source, a persulfate, an alkali compound to a haptoreaction in water to obtain the one-dimensional MnO2@C@Ni(OH)2 core-shell nanowire composite material. The one-dimensional manganese dioxide@carbon@nickel hydroxide core-shell nanowire composite material has an ultra-long one-dimensional shape structure and superior electrochemical performance, so that it can be applied to a supercapacitor electrode material. The preparation method is simple and low in cost.

Description

technical field [0001] The present invention relates to a core-shell nanowire composite material, in particular to a preparation method and application of a one-dimensional manganese dioxide@carbon@nickel hydroxide core-shell nanowire composite material. Background technique [0002] Due to the increasing demand for next-generation electrochemical memories, supercapacitors are considered as one of the most potentially valuable energy storage devices, which can exhibit high charge-discharge efficiency, long cycle life, and ultrahigh power density. According to the energy storage mechanism, capacitors can be divided into two types: one is non-Faradaic double-layer capacitors, and the other is Faraday pseudocapacitors, which are usually composed of transition metal oxides. Among these transition metal oxides, MnO 2 It is particularly valuable for research because it has a high theoretical specific capacity (theoretical pseudocapacitance is 1370F g -1 ), small voltage hysteres...

Claims

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Application Information

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IPC IPC(8): H01G11/30H01G11/32H01G11/46H01G11/24B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00H01G11/24H01G11/30H01G11/32H01G11/46Y02E60/13
Inventor 王秀华容芳唐纪平
Owner ANHUI NORMAL UNIV
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