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Carbon quantum dot/nickel hydroxide electrochemical energy storage material, synthesis method and application

A technology of carbon quantum dots and nickel hydroxide, which is applied in the synthesis of new energy nanomaterials and electrochemistry, can solve the problems of low energy density and short cycle life of supercapacitors, and achieve good application prospects

Inactive Publication Date: 2018-09-21
CHINA UNIV OF PETROLEUM (EAST CHINA)
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Problems solved by technology

[0005] The invention provides an electrochemical energy storage material based on carbon quantum dots-induced self-assembly of nickel hydroxide, a synthesis method and an application. The material presents a multi-level structure with abundant pores and a large specific surface area, and can be used for supercapacitors to solve At present, the problems of low energy density and short cycle life of supercapacitors

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  • Carbon quantum dot/nickel hydroxide electrochemical energy storage material, synthesis method and application
  • Carbon quantum dot/nickel hydroxide electrochemical energy storage material, synthesis method and application
  • Carbon quantum dot/nickel hydroxide electrochemical energy storage material, synthesis method and application

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Embodiment 1

[0042](1) Preparation of carbon quantum dots: Weigh 1.0-3.0g sodium hydroxide, put it into a 200mL beaker, add deionized water, absolute ethanol, ultrasonic 5-20min, use platinum sheet as electrode, connect DC power supply, Adjust the voltage to 10-30V. After 6-24 hours of electrolysis, after removing the electrolyte, a pure carbon quantum dot solution is obtained.

[0043] (2) Preparation of nickel hydroxide: put a certain amount of deionized water into a beaker, then weigh 1-3 mmol of nickel acetate, stir evenly, and then add 0.1-0.3 g of urea. Then pour the above solution into a reaction kettle, put it into an electric blast drying oven, control the reaction temperature, and perform hydrothermal reaction for different times to prepare nickel hydroxide. The reaction temperature is 100°C-200°C, and the reaction time is 5h-10h.

[0044] (3) Preparation of carbon quantum dots / nickel hydroxide: Take a total of 40ml of the carbon quantum dot solution and deionized water mixed s...

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Abstract

The invention provides a carbon quantum dot / nickel hydroxide electrochemical energy storage material, the material is a multi-level structure with carbon quantum dots as a skeleton and nickel hydroxide ultrathin nanosheets, and the expression is CQDs / Ni( OH) 2. Synthesis methods and applications of the above materials are also provided. First, the carbon quantum dot solution was prepared by electrolysis of absolute ethanol, and then under the hydrothermal reaction conditions, the nickel hydroxide two-dimensional The flakes are self-assembled, and by adjusting the reaction time and the amount of carbon quantum dots, a multi-level structure with abundant channels and large specific surface area is prepared. With this material as the negative electrode and activated carbon as the positive electrode, the prepared capacitor exhibits a wide potential window, high energy density and good cycle stability. It is a kind of supercapacitor with application prospects and is suitable for new energy development. .

Description

technical field [0001] The invention belongs to the field of synthesis of new energy nanomaterials and electrochemical technology, and specifically relates to an electrochemical energy storage material, synthesis method and application based on carbon quantum dot-induced self-assembly of nickel hydroxide. Background technique [0002] Global warming and the gradual depletion of fossil fuels are the biggest challenges people face in this century. In order to meet the needs of modern society and solve this urgent ecological problem, it is necessary to quickly discover and develop low-cost, environmentally friendly energy conversion and storage systems. important. Batteries and supercapacitors are the most efficient and practical technologies for electrochemical energy conversion and storage in many application areas. Compared with traditional secondary batteries, supercapacitors have the advantages of high power density, good cycle performance, and high safety performance. Th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01G11/24H01G11/30H01G11/36H01G11/42H01G11/86
CPCY02E60/13
Inventor 安长华魏桂涓杜坤赵西夏王淑涛王兆杰张军
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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