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new style 2 Coated mesoporous hollow carbon sphere composite material and its preparation method and application in supercapacitor

A technology for supercapacitors and hollow carbon spheres, applied in hybrid capacitor electrodes, binary selenium/tellurium compounds, nano-carbons, etc., can solve the problems of harsh preparation conditions, complicated procedures, and high equipment requirements, and achieve simple preparation processes and simple methods Ease of operation and high safety performance

Active Publication Date: 2021-06-15
HUBEI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The prepared mesoporous carbon microspheres have uniform particle size and controllable pore size, but the process is relatively complicated, the preparation conditions are relatively harsh, and the equipment requirements are high

Method used

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  • new style <sub>2</sub> Coated mesoporous hollow carbon sphere composite material and its preparation method and application in supercapacitor
  • new style <sub>2</sub> Coated mesoporous hollow carbon sphere composite material and its preparation method and application in supercapacitor
  • new style <sub>2</sub> Coated mesoporous hollow carbon sphere composite material and its preparation method and application in supercapacitor

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Embodiment 1

[0062] A kind of novel NiSe of the present embodiment 2 A method for preparing a coated mesoporous hollow carbon sphere composite material, the method specifically includes the following steps:

[0063] (1) Preparation of mesoporous hollow carbon spheres

[0064] (i) Use propyl orthosilicate (TPOS) and orthoethyl orthosilicate (TEOS) as the silicon source to ultrasonically disperse in an aqueous solution dissolved in ethanol (solvent) and ammonia (basic condition) for 10 minutes, then add m-phthalic acid Phenol (used to provide phenolic hydroxyl groups) and formaldehyde (used to provide aldehyde hydroxyl groups), and then the resulting mixture was magnetically stirred at room temperature for 20h, and finally suction filtered, washed, and dried to obtain SiO 2 / SiO 2 @RF Composite structure. The consumption of wherein said TPOS, TEOS is respectively 0.5mmol, 1.5mmol; The consumption of ethanol, ammoniacal liquor, deionized water is 60ml, 3ml, 20ml successively, and the consu...

Embodiment 2

[0081] A kind of novel NiSe of the present embodiment 2 A method for preparing a coated mesoporous hollow carbon sphere composite material, the method specifically includes the following steps:

[0082] (1) Preparation of mesoporous hollow carbon spheres

[0083] (i) ultrasonically disperse methyl orthosilicate (TMOS) as a silicon source in an aqueous solution of ethanol (solvent) and ammonia (basic condition) for 15 min, then add resorcinol (for providing phenolic hydroxyl groups) and Formaldehyde (used to provide aldehyde hydroxyl groups), and then the resulting mixture was magnetically stirred at room temperature for 25h, and finally suction filtered, washed, and dried to obtain SiO 2 / SiO 2 @RF Composite structure. The consumption of wherein said TMOS is 2mmol; The consumption of ethanol, ammoniacal liquor, deionized water is successively 60ml, 3ml, 20ml, and the consumption of resorcinol is 0.3g, and the consumption of formaldehyde is 0.56ml (the density of described f...

Embodiment 3

[0092] A kind of novel NiSe of the present embodiment 2 A method for preparing a coated mesoporous hollow carbon sphere composite material, the method specifically includes the following steps:

[0093] (1) Preparation of mesoporous hollow carbon spheres

[0094] (i) Sodium silicate (Na 2 SiO 3 ) was ultrasonically dispersed as a silicon source in an aqueous solution dissolved with ethanol (solvent) and ammonia water (basic condition) for 20 min, then resorcinol (for providing phenolic hydroxyl) and formaldehyde (for providing aldehyde hydroxyl) were added, and then The resulting mixture was magnetically stirred at room temperature for 30 h, and finally filtered, washed, and dried to obtain SiO 2 / SiO 2 @RF Composite structure. Wherein the consumption of sodium silicate is 2mmol; The consumption of ethanol, ammoniacal liquor, deionized water is successively 60ml, 3ml, 20ml, and the consumption of resorcinol is 0.5g, and the consumption of formaldehyde is 0.56ml (the density...

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Abstract

The invention discloses a novel NiSe 2 Coated mesoporous hollow carbon sphere composite material and its preparation method and application in supercapacitors. The present invention adopts a one-step method without any surfactant, and stirs at room temperature in situ to synthesize mesoporous carbon nanospheres with adjustable pore size and particle size, and then uniformly deposits a layer of Ni(OH) on its surface in a water bath using a simple chemical precipitation method. 2 Nanosheets, finally selenized to obtain the target product (HMCS / NiSe 2 ), solved the simple Ni(OH) 2 The problem of excessive aggregation of nanosheets; at the same time, the introduction of carbon also improves the conductivity of the entire material. The introduction of mesoporous carbon, to a large extent alleviated the simple NiSe 2 For the problem of volume expansion of the nanosheets during the charging and discharging process of the electrochemical test, the composite material of the present invention is used as the positive electrode active material of the supercapacitor, and its rate performance is very good, and after 5000 cycles, it still maintains 80.5% capacity.

Description

technical field [0001] The invention belongs to the field of new energy materials, in particular to a novel NiSe 2 Coated mesoporous hollow carbon sphere composite material and its preparation method and application in supercapacitors. Background technique [0002] According to the energy formula of the supercapacitor: E=1 / 2CV2, increasing the specific capacitance C and working voltage V of the capacitor can effectively improve the energy density of the supercapacitor. At the same time, the decomposition voltage of the electrolyte is a key factor affecting the supercapacitor. The positive and negative electrodes of traditional water-based electric double layer supercapacitors are generally activated carbon, but due to the uneven pore size of activated carbon, many pores are closed and closed, resulting in a decrease in its specific surface area and a low utilization rate of the material. At the same time, the decomposition voltage of water itself greatly limits the working ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01G11/24H01G11/30H01G11/42C01B19/04C01B32/15
CPCC01B19/007C01B32/15H01G11/24H01G11/30H01G11/42Y02E60/13
Inventor 万厚钊赵晓娟王浩张军汪汉斌
Owner HUBEI UNIV
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