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A kind of preparation method of c3n4 enhanced supercapacitor

A supercapacitor, C3N4 technology, applied in the manufacture of hybrid/electric double-layer capacitors, hybrid capacitor electrodes, etc., can solve the problem that the advantages of g-C3N4 high specific surface area are not fully utilized, and achieve stable cycle efficiency, convenient operation, high Effect of specific capacitance value

Inactive Publication Date: 2019-09-24
CHANGCHUN UNIV OF TECH
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Problems solved by technology

However, the g-C3N4 obtained by these methods is mainly a two-dimensional structure, and there are a large number of defect states in the preparation process, and the advantages of the high specific surface area of ​​g-C3N4 have not been fully utilized.

Method used

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Embodiment Construction

[0015] The present invention comprises the following steps

[0016] 1), preparation of C3N4 powder:

[0017] Weigh 20 g of urea and place it in a crucible, place the crucible in a muffle furnace, set the temperature program to rise from room temperature to 550 °C at a rate of 10 °C per minute, maintain at 550 °C for 2 hours, and cool to room temperature. Obtain C3N4 powder.

[0018] 2), preparation of three-dimensional C3N4 airgel:

[0019] Add 500mg of C3N4 powder into 20ml of 3M KOH, heat to 60°C and stir for 12h. The stirred liquid was ultrasonicated for two hours, slowly poured into a dialysis bag with a molecular weight cut off of 3500, and dialyzed until neutral. Finally, it is freeze-dried in a freeze dryer to obtain a three-dimensional C3N4 airgel.

[0020] 3) Preparation of three-dimensional airgel of C3N4@PEDOT:PSS

[0021] Measure 5ml of C3N4 solution with a concentration of 5mg / ml after dialysis and measure 10ml of PEDOT:PSS (poly 3,4-ethylenedioxythiophene / po...

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Abstract

The invention discloses a preparation method of a C3N4 enhanced supercapacitor. The method prepares C3N4 of a three-dimensional structure, and the C3N4 of the three-dimensional structure is taken as an electrode material of a composite electrode and is assembled into the supercapacitor with electrolyte and a current collector. The method utilizes the high specific surface area characteristic of the three-dimensional C3N4 structure and increases effective contact area of a pseudocapacitor material poly(3,4-ethylenedioxythiophene) (PEDOT) / poly(styrenesulfonate); meanwhile, PEDOT is utilized formaking up the defect that conductivity of C3N4 is low, then specific capacitance of the supercapacitor is increased and cycle efficiency is improved, and the preparation method is simple.

Description

technical field [0001] The invention relates to a method for preparing an enhanced supercapacitor, in particular to a three-dimensional graphene-like phase C3N4 (g-C3N4) to improve the specific surface area and charge capacity of electrode materials. Background technique [0002] With the increasingly serious environmental pollution, there is an urgent need for a clean and efficient energy device to replace fossil fuels. As a new type of energy storage device, supercapacitors have received extensive attention in recent years. Compared with conventional energy storage devices, it has higher power density and better cycle stability. According to the different mechanisms used in the energy storage process, it is mainly divided into electric double layer capacitors, Faraday capacitors and hybrid capacitors. Among them, the energy storage mode of the electric double layer capacitor mainly depends on the adsorption process of electrolyte ions on the electrode surface, which belo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01G11/24H01G11/30H01G11/48H01G11/84H01G11/86
CPCH01G11/24H01G11/30H01G11/48H01G11/84H01G11/86Y02E60/13
Inventor 张学宇汤志伟吕威段连峰渠源多
Owner CHANGCHUN UNIV OF TECH
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