co 3 o 4 /co 2 P coaxial heterostructure material and its preparation method and application

A heterostructure, coaxial technology, applied in nanotechnology, nanotechnology, hybrid capacitor electrodes, etc. for materials and surface science, can solve the problem of low energy density of MSCs, insufficient to meet the needs of microelectronic devices, and limit the development of MSCs To achieve good electron conductivity, achieve energy density and rate performance, high capacity and cycle stability

Active Publication Date: 2020-12-22
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the energy density of MSCs is currently low, which is not enough to meet the needs of microelectronic devices, which is the main reason for limiting the development of MSCs.

Method used

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  • co <sub>3</sub> o <sub>4</sub> /co <sub>2</sub> P coaxial heterostructure material and its preparation method and application
  • co <sub>3</sub> o <sub>4</sub> /co <sub>2</sub> P coaxial heterostructure material and its preparation method and application
  • co <sub>3</sub> o <sub>4</sub> /co <sub>2</sub> P coaxial heterostructure material and its preparation method and application

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Effect test

Embodiment 1

[0024] A kind of Co 3 o 4 / Co 2 The preparation process of P coaxial heterostructure micro-supercapacitor electrode materials, such as figure 1 , including the following steps:

[0025] 1) Using a hydrothermal method to prepare cobalt hydroxide nanowires:

[0026] 1a) Foam nickel cleaning: first cut the foam nickel, pass through hydrochloric acid, deionized water, acetone, and ethanol in sequence for 15 minutes, and dry it in a 60°C oven for 12 hours, take out and weigh the dry nickel foam;

[0027] 1b) Add 2mmol of cobalt chloride hexahydrate, 1mmol of ammonium fluoride, and 4mmol of urea into 70mL of deionized water, and stir for 15 minutes to dissolve them evenly;

[0028] 1c) Add the solution into a polytetrafluoroethylene reactor, put in the foamed nickel that has been weighed after cleaning, and heat it in water at 120°C for 8-12 hours. After cooling, wash it centrifugally with deionized water and ethanol, and put it into Oven drying obtains the nickel foam that is ...

Embodiment 2

[0037] A kind of Co 3 o 4 / Co 2 The preparation process of P coaxial heterostructure micro-supercapacitor electrode material comprises the following steps:

[0038] 1) Using a hydrothermal method to prepare cobalt hydroxide nanowires:

[0039] 1a) Foam nickel cleaning: first cut the foam nickel, pass through hydrochloric acid, deionized water, acetone, and ethanol in sequence for 15 minutes, and dry it in a 60°C oven for 12 hours, take out and weigh the dry nickel foam;

[0040] 1b) Add 5 mmol of cobalt chloride hexahydrate, 2.5 mmol of ammonium fluoride, and 10 mmol of urea into 70 mL of deionized water, and stir for 20 minutes to dissolve them evenly;

[0041] 1c) Add the solution into a polytetrafluoroethylene reactor, put in the foamed nickel that has been weighed after cleaning, and heat it in water at 120°C for 8-12 hours. After cooling, wash it centrifugally with deionized water and ethanol, and put it into Oven drying obtains the nickel foam that is loaded with cob...

Embodiment 3

[0049] A kind of Co 3 o 4 / Co 2 The preparation process of P coaxial heterostructure micro-supercapacitor electrode material comprises the following steps:

[0050] 1) Using a hydrothermal method to prepare cobalt hydroxide nanowires:

[0051] 1a) Cleaning of foamed nickel: First, cut out the foamed nickel, pass through hydrochloric acid, deionized water, acetone, and ethanol in sequence for 15 minutes, and dry it in an oven at 60°C for 12 hours, then take out and weigh the mass of the dried nickel foam.

[0052] 1b) Add 10 mmol of cobalt chloride hexahydrate, 5 mmol of ammonium fluoride, and 20 mmol of urea into 70 mL of deionized water, and stir for 30 minutes to dissolve them evenly.

[0053] 1c) Add the solution into a polytetrafluoroethylene reactor, put in the foamed nickel that has been weighed after cleaning, and heat it in water at 120°C for 8-12 hours. After cooling, wash it centrifugally with deionized water and ethanol, and put it into Oven drying to obtain nic...

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Abstract

The invention relates to a Co3O4 / Co2P coaxial heterostructure material and a preparation method thereof. The preparation method includes the following steps: (1) sintering cobalt hydroxide nanowires in a hydrogen phosphide atmosphere to obtain cobalt phosphide nanowires; and (2) quickly annealing the cobalt phosphide nanowires to oxidize the surface layer to obtain a micro super capacitor electrode material with a Co3O4 / Co2P coaxial heterostructure. The beneficial effects are as follows: for the Co3O4 / Co2P coaxial heterostructure, the outer Co3O4 will provide pseudocapacitance capacity, whilethe inner Co2P has high conductivity; and meanwhile, because the electrochemical reaction only occurs on the surface or near the surface of the material, the inner Co2P cannot directly contact and adsorb solution ions at high reaction potential, and water decomposition will not be catalyzed. Therefore, the coaxial heterostructure maintains high capacity and cyclic stability, and has good electronic conductivity and higher rate performance.

Description

technical field [0001] The invention belongs to the intersecting field of material preparation and micro supercapacitor, and specifically relates to a Co 3 o 4 / Co 2 P coaxial heterostructure material and its preparation method. Background technique [0002] With the advancement and development of science and technology, human society has entered the information age. Modern electronic equipment and technology developed on the basis of semiconductor technology have greatly facilitated people's daily life. The emergence and popularization of wearable smart electronic equipment and the Internet of Things have further Increased people's demand for miniaturization and portability of energy storage equipment. Among micro energy storage devices, micro supercapacitors (Microsupercpacitors, MSCs) have received extensive attention due to their advantages of high power density, fast charge and discharge time, and long cycle life, and have great potential in the fields of microelectr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01G11/24H01G11/30H01G11/46B82Y30/00B82Y40/00
Inventor 何亮张妍嘉洪旭峰
Owner WUHAN UNIV OF TECH
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