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g‑c for supercapacitors 3 no 4 Preparation method of carbon quantum dot composite electrode material

A technology of supercapacitors and carbon quantum dots, which is applied in the manufacture of hybrid/electric double layer capacitors, etc., can solve the problems of limited application, weak electron transfer ability and non-conductivity, and achieve simple preparation methods, increased electron transfer rates, and no side effects. The effect of the product

Active Publication Date: 2017-01-18
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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  • g‑c for supercapacitors <sub>3</sub> no <sub>4</sub> Preparation method of carbon quantum dot composite electrode material
  • g‑c for supercapacitors <sub>3</sub> no <sub>4</sub> Preparation method of carbon quantum dot composite electrode material
  • g‑c for supercapacitors <sub>3</sub> no <sub>4</sub> Preparation method of carbon quantum dot composite electrode material

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

A preparation method of g-C3N4 / carbon quantum dot composite electrode material for supercapacitors, adding carbon quantum dots to ethanol to prepare carbon quantum dot ethanol solution; mixing urea with carbon quantum dot ethanol solution, after ultrasonic dispersion Transfer to a crucible, use a muffle furnace to gradually raise the temperature to 350°C-700°C for 1h-3h, then drop to room temperature, add ethanol to grind and filter the obtained material to obtain the g-C3N4 / carbon quantum dot composite material. The advantages are: the preparation method is simple, there is no by-product, the raw material is easy to obtain, and the price is low; the obtained composite material has stable performance, is not easy to decompose, and is non-toxic; it can increase the electron transfer rate of the g-C3N4 material, has good electrical conductivity, and enhances the electrode The specific surface area enhances the ability of the electrode surface to absorb electrons, effectively increasing the specific capacitance of the 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 Patents(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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