Three-dimensional porous carbon-manganese oxide core shell structure material as well as preparation method and application thereof

A core-shell structure, three-dimensional porous technology, applied in the preparation/purification of carbon, manganese oxide/hydroxide, nanotechnology for materials and surface science, etc. , poor cycle stability, etc., to achieve excellent charge-discharge cycle stability, large specific surface area, and good mechanical stability.

Active Publication Date: 2020-01-17
FUJIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But the MnO 2 When used as a supercapacitor electrode material, MnO 2 The low conductivity (10 -5 -10 -6 S / cm, Jian-Gan Wang et al., Progress in Materials Science 74 (2015) 51-124) affects the chemical properties of supercapacitors, and it also has disadvantages such as low ion transmission rate, small specific capacitance, and poor cycle stability.

Method used

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  • Three-dimensional porous carbon-manganese oxide core shell structure material as well as preparation method and application thereof
  • Three-dimensional porous carbon-manganese oxide core shell structure material as well as preparation method and application thereof
  • Three-dimensional porous carbon-manganese oxide core shell structure material as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Three-dimensional porous carbon-manganese oxide core-shell materials (C@MnO 2 Nanoneedle) preparation:

[0026] 1) Preparation of three-dimensional honeycomb porous carbon skeleton: Cut the cleaned cork bark into a square shape of 10mm x 10mm x 3mm in length, dry it at 60°C and soak it in 0.5mol / L potassium hydroxide solution for 6 h, then take it out, and put it in a vacuum box to dry at 60°C for 24 h; put the treated cork bark into a ceramic boat with a cover, and then put the ceramic boat in a high-temperature horizontal tube furnace, and wait for the tube furnace When the medium vacuum degree reaches 0.1 Pa, feed high-purity Ar gas (purity up to 99.999%) at 300 mL / min, turn on the heating power, control the heating rate at 1 °C / min, heat the furnace temperature to 900 °C, and hold for 1.5 h, and then cooled to room temperature with the furnace under the protection of Ar gas, a three-dimensional honeycomb porous carbon framework with regular arrangement was obtained...

Embodiment 2

[0036] Three-dimensional porous carbon-manganese oxide core-shell materials (C@MnO 2 Nanoflowers) preparation:

[0037] 1) Preparation of three-dimensional honeycomb porous carbon skeleton: cut the cleaned cork bark into a square shape of 10 mm x 10 mm x 3 mm in height, dry it at 60 °C and soak it in 0.7 mol / L potassium hydroxide solution for 5 h, then take it out, put it in a vacuum box and dry it at 60°C for 24 h; put the treated cork bark into a ceramic boat with a cover, then put the ceramic boat in a high-temperature horizontal tube furnace, and wait for it to When the vacuum degree reaches 0.1 Pa, feed high-purity Ar gas (purity up to 99.999%) at 300 mL / min, turn on the heating power, control the heating rate at 1 °C / min, heat the furnace to 1000 °C, and keep it for 1 h , and then cooled to room temperature with the furnace under the protection of Ar gas, a three-dimensional honeycomb porous carbon framework with regular arrangement was obtained, and its specific surfac...

Embodiment 3

[0040] Three-dimensional porous carbon-manganese oxide core-shell materials (C@MnO 2 Nanoparticles) Preparation:

[0041] 1) Preparation of three-dimensional honeycomb porous carbon skeleton: cut the cleaned cork bark into a square shape of 10mm x 10mm x 3mm in length, dry it at 60°C and soak it in 0.8mol / L potassium hydroxide solution for 4 h, then take it out, put it in a vacuum box and dry it at 60°C for 24 h; put the treated cork bark into a ceramic boat with a cover, then put the ceramic boat in a high-temperature horizontal tube furnace, and wait for it to When the vacuum degree reaches 0.1 Pa, high-purity Ar gas (purity up to 99.999%) is introduced at 300 mL / min, the heating power is turned on, the heating rate is controlled at 1 °C / min, the furnace temperature is heated to 900 °C, and the temperature is kept for 2 h , and then cooled to room temperature with the furnace under the protection of Ar gas, a three-dimensional honeycomb porous carbon framework with regular ...

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Abstract

The invention discloses a three-dimensional porous carbon-manganese oxide core shell structure material and a preparation method thereof. The three-dimensional honeycomb porous carbon prepared by taking bark as a raw material is used as a skeleton, and a MnO2 nano structure grows on the surface of the skeleton to prepare the C-coated MnO2 with a core shell structure. The three-dimensional porous carbon-manganese oxide core shell structure material enables overall conductivity and electrochemical activity of the MnO2 material to be improved with the help of the high conductivity and a large specific surface area of the carbon skeleton, and gives a full part in the synergistic effect of the core shell structure, so that the three-dimensional porous carbon-manganese oxide core shell structurematerial has the advantages of high conductivity, large specific capacitance and good cycling stability, and can be used as a supercapacitor electrode material.

Description

technical field [0001] The invention belongs to the technical field of energy storage materials, and in particular relates to a three-dimensional porous carbon-manganese oxide core-shell structure material and a preparation method thereof, which can be applied to the fields of energy storage and energy conversion. Background technique [0002] As a novel electrochemical energy storage device, supercapacitor has high power density, fast charging and discharging ability and excellent cycle stability, and has great application prospects in flexible wearable electronics, new energy vehicles and other fields. Among them, transition metal oxides, such as nanostructured MnO 2 , due to its wide range of sources, low preparation cost, good stability, and high capacity (theoretical capacity up to 1370F / g), its application in energy storage has attracted extensive attention from researchers. But the MnO 2 When used as a supercapacitor electrode material, MnO 2 The low conductivity (...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G11/30H01G11/32H01G11/44H01G11/46H01G11/24C01B32/05C01G45/02B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00C01G45/02C01P2004/80C01P2006/12C01B32/05H01G11/24H01G11/30H01G11/32H01G11/44H01G11/46Y02E60/13
Inventor 马立安陈彦斌魏朝晖赖文宗林德叶晓云梁卫抗陈洪祥陈平川王乾廷
Owner FUJIAN UNIV OF TECH
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