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: 2017-03-15
CHINA UNIV OF PETROLEUM (EAST CHINA)
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[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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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 adopts a multi-stage structure assembled by nickel hydroxide ultra-thin nanosheets by taking the carbon quantum dot as a framework; and the expression of the material is CQDs / Ni(OH)<2>. The invention also provides a synthesis method and an application of the material. A carbon quantum dot solution is prepared by adopting an absolute ethyl alcohol electrolysis method firstly; then the self-assembling of the nickel hydroxide two-dimensional thin sheets are driven through a static effect between the carbon quantum dots and nickel ions and a <pi>-<pi> conjugation effect between the carbon quantum dots in a hydrothermal reaction condition; by regulating and controlling the reaction time and the dosage of the carbon quantum dots, the multi-stage structure with rich pore canals and relatively large specific surface area is prepared; and a capacitor which is prepared by taking the material as the negative electrode and taking active carbon as the positive electrode represents relatively wide potential window, relatively high energy density and high cycling stability, and the prepared capacitor is a supercapacitor with application prospect, so that the energy storage material is applicable to the new energy development field.
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...
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IPC IPC(8): H01G11/24H01G11/30H01G11/36H01G11/42H01G11/86
CPCY02E60/13H01G11/24H01G11/30H01G11/36H01G11/42H01G11/86
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)