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A method for preparing a g-C3N4/carbon quantum dot composite electrode

A technology of carbon quantum dots and composite electrodes, which is applied in the field of preparation of g-C3N4/carbon quantum dot composite electrodes, can solve the problems of limited application, weak electron transfer ability and non-conductivity, and achieves simple preparation method and increased electron transfer rate. , the effect of stable performance

Active Publication Date: 2014-04-23
BOHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

but since g-C 3 N 4 The shortcomings of the material, such as weak electron transfer ability and non-conductivity, limit its application in supercapacitor electrode materials.

Method used

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  • A method for preparing a g-C3N4/carbon quantum dot composite electrode
  • A method for preparing a g-C3N4/carbon quantum dot composite electrode
  • A method for preparing a g-C3N4/carbon quantum dot composite electrode

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] 1.1. Preparation of ethanol solution of carbon quantum dots

[0021] Adding carbon quantum dots to ethanol is prepared into a carbon quantum dot ethanol solution with a mass percentage concentration of carbon quantum dots of 30%;

[0022] 1.2. Preparation of g-C 3 N 4 / Carbon quantum dot composite material

[0023] Mix 1 g of urea with 1 g of carbon quantum dot ethanol solution with a concentration of 30%, disperse it in a 45W ultrasonic wave for 5 min, transfer it to a crucible, and gradually raise the temperature to 550 °C in a muffle furnace for 2 h and then lower it to room temperature to obtain a powdery substance. The product was obtained after trituration with ethanol and filtration. The product was mixed with pure C of uncomplexed carbon quantum dots 3 N 4 Transmission electron microscopy characterization (TEM) was performed. figure 1 is pure C 3 N 4 TEM, it can be seen from the figure that C 3 N 4 Wrinkled sheet structure with nanoscale thickness clo...

Embodiment 2

[0027] 1.1. Preparation of ethanol solution of carbon quantum dots

[0028] Carbon quantum dots are added to ethanol to be prepared with carbon quantum dots mass percentage concentration 32% carbon quantum dots ethanol solution;

[0029] 1.2. Preparation of g-C 3 N 4 / Carbon quantum dot composite material

[0030] Mix 1 g of urea with 1.2 g of carbon quantum dot ethanol solution with a concentration of 32%, disperse it in a crucible with 55W ultrasonic wave for 30 min, and gradually raise the temperature to 350°C in a muffle furnace for 1 h and then lower it to room temperature to obtain a powdery substance. G-C is obtained after grinding and filtering with ethanol 3 N 4 / Carbon quantum dot composites.

[0031] With prepared g-C 3 N 4 The carbon quantum dot electrode material was assembled into a button-type supercapacitor according to the same method as in Example 1, and an electrochemical workstation was used to test its cyclic voltammetry, AC impedance, and constan...

Embodiment 3

[0033] 1.1. Preparation of ethanol solution of carbon quantum dots

[0034] Carbon quantum dots are added to ethanol to be prepared into a carbon quantum dot ethanol solution with a carbon quantum dot mass percentage concentration of 28%;

[0035] 1.2. Preparation of g-C 3 N 4 / Carbon quantum dot composite material

[0036] Mix 1g of urea with 1.5g of carbon quantum dot ethanol solution with a concentration of 28%, disperse it with 50W ultrasonic wave for 20 minutes, transfer it to a crucible, and gradually raise the temperature to 600°C in a muffle furnace for 1.5 hours and then lower it to room temperature to obtain a powdery substance. Add ethanol to grind and filter to get g-C 3 N 4 / Carbon quantum dot composites.

[0037] With prepared g-C 3 N 4 The carbon quantum dot electrode material was assembled into a button-type supercapacitor according to the same method as in Example 1, and an electrochemical workstation was used to test its cyclic voltammetry, AC impeda...

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Abstract

Provided is a method for preparing a g-C3N4 / carbon quantum dot composite electrode. The method comprises: adding carbon quantum dots into ethanol in order to prepare carbon quantum dot ethanol solution; mixing urea with the carbon quantum dot ethanol solution, performing ultrasonic dispersion on the mixed solution and then transferring the mixed solution to a crucible; warming the mixed solution to 350 to 700 degree centigrade with a muffle furnace step by step, maintaining the temperature for one to three hours and then decreasing the temperature of the mixed solution to room temperature; and grinding the obtained substance with ethanol and filtering the same so as to obtain g-C3N4 / carbon quantum dot composite material. The method has advantages of simpleness, no by-products, raw material easy to obtain, and low price. The obtained composite material is stable in performance, uneasy to decompose, and nontoxic. The method may increase the electron transfer rate of the g-C3N4 material, has good conductive performance, enhances electrode specific area, improves the electron adsorption capability of an electrode surface, and effectively increases the specific capacitance of a capacitor.

Description

technical field [0001] The present invention relates to a g-C 3 N 4 / The preparation method of carbon quantum dot composite electrode. Background technique [0002] Supercapacitors emerged in the 1970s to 1980s. Due to their good power performance, large specific capacity, environmental friendliness and long cycle life, they have important applications in electric vehicles, communications, and military affairs. A supercapacitor consists of three parts: electrode material, electrolyte solution, and diaphragm. Electrode materials are the core content of supercapacitor research. Among them, the single-atom sheet structure of graphene material has high specific surface area, high electrical conductivity, chemical stability and other characteristics, which have always been a hot spot in the research of supercapacitors. [0003] g-C 3 N 4 It has a graphene-like structure and is a two-dimensional carbon-nitrogen compound. This graphene-type sheet structure makes g-C 3 N 4 ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G11/86
Inventor 魏颖张庆国刘海超武宣宇李美超刘娟
Owner BOHAI UNIV
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