A graphene oxide/sio 2 Application of Composite Materials

A composite material, graphene technology, applied in the direction of hybrid capacitor electrodes, etc., can solve the problems of low electrochemical stability, poor power storage performance, easy stacking, etc., to improve the utilization rate of specific surface area, good electrochemical power storage performance , the effect of low cost

Active Publication Date: 2017-05-10
HANGZHOU NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In order to solve the current problems of single graphene oxide materials such as easy stacking, low electrochemical stability, and poor electrical storage performance, the present invention proposes a graphene oxide / SiO 2 The application of composite materials, the raw materials used in the present invention are common and easy to obtain, the cost is low, the preparation process is simple and safe, the energy consumption is low, the operability is strong, and the composite materials have good electricity storage performance

Method used

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  • A graphene oxide/sio <sub>2</sub> Application of Composite Materials
  • A graphene oxide/sio <sub>2</sub> Application of Composite Materials

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] (1) Preparation of graphene oxide dispersion: prepare 1 L of suspension containing 0.1 g graphene oxide (carbon:oxygen molar ratio approximately equal to 8) with n-butanol as solvent, and vibrate ultrasonically (50W) for 1 hour to form oxidized Graphene dispersions.

[0035] (2) Graphene Oxide / SiO 2 Preparation: Add 346.9g of tetraethyl orthosilicate (about 1.665mol) to the graphene oxide dispersion obtained in the first step (about 1.665mol) to make a reaction mixture, adjust the pH with phosphoric acid 3 to 5, the mixture is moderately strong acidic, and reacted with magnetic stirring at 60°C for 8 hours.

[0036] (3) After-treatment of the product: the solvent is removed by vacuum distillation, the pressure is -0.1MPa, and the temperature is 110°C. The collected product was washed repeatedly to remove various unreacted raw materials, impurities or by-products, and placed in a vacuum oven at 100°C for 8 hours to obtain graphene oxide / SiO 2 composite material1.

[...

Embodiment 2

[0041] (1) Preparation of graphene oxide dispersion: prepare 1L of suspension containing 0.45g graphene oxide (carbon:oxygen molar ratio approximately equal to 8) with water as solvent, and form graphene oxide by ultrasonic oscillation (100W) for 1 hour of the dispersion.

[0042] (2) Graphene Oxide / SiO 2 Preparation: the graphene oxide dispersion obtained in the first step and an aqueous mixture (50 g of water, about 2.777 mol) of 30 g tetraethyl orthosilicate (about 0.144 mol) were made into a reaction mixture, and the pH of the reaction mixture was adjusted with ammonia water The value is 8-10, making the mixture weakly alkaline, and reacting with magnetic stirring at 5° C. for 10 hours.

[0043] (3) Product post-processing: settle the product of the second step with a high-speed centrifuge, collect the product after standing, and repeat the operation many times. Wash the collected product repeatedly to remove various unreacted raw materials, impurities or by-products, va...

Embodiment 3

[0048] (1) Preparation of graphene oxide dispersion: 1,4-dioxane: water (about 10mol) volume ratio is 10: 1 mixed solvent preparation containing 0.5g graphene oxide (carbon: oxygen molar ratio is approximately equal to 8) 2L of the suspension was ultrasonically oscillated (250W) for 1 hour to form a graphene oxide dispersion.

[0049] (2) Graphene Oxide / SiO 2 Preparation: Add 3.7g tetramethyl orthosilicate (about 0.035mol) to the graphene oxide dispersion obtained in the first step to make a reaction mixture, adjust the pH value to 5-6.5 with p-toluenesulfonic acid, and make the mixture Weakly acidic, react with magnetic stirring at 5°C for 15 hours.

[0050] (3) After-treatment of the product: the solvent is removed by vacuum distillation, the pressure is -0.1MPa, and the temperature is 100°C. The collected product was washed repeatedly to remove various unreacted raw materials, impurities or by-products, and placed in a vacuum oven at 100°C for 8 hours to obtain graphene o...

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Abstract

The invention relates to the crossing field of inorganic composite materials and new energy technology, and discloses an application for a graphene oxide / SiO2 composite material, aiming at solving the problems that a single graphene oxide material is easy to stack, low in electrochemical stability, poor in electricity storage performance, and the like at present. The application comprises the step of preparing a graphene oxide dispersion liquid at first, and then preparing graphene oxide / SiO2, and then treating the product to obtain the graphene oxide / SiO2 composite material, and finally mixing the graphene oxide / SiO2 composite material with a conductive agent, and pressing on a current collector by an adhesive to prepare an electrode material or further assembling to form an electricity storage component. The raw materials used in the application disclosed by the invention are common and easy to get, and low in cost; the preparation process is simple, safe, low in energy consumption, and high in operability; the composite material is good in electricity storage performance.

Description

technical field [0001] The present invention relates to the interdisciplinary field of inorganic composite materials and new energy technologies, in particular to a graphene oxide / SiO 2 Inorganic composite materials and their applications in the field of new energy. Background technique [0002] Energy and environmental issues are two major problems that human beings need to solve urgently. Today, with the depletion of fossil energy, increasingly serious environmental pollution, and global warming, it is particularly urgent to seek renewable green energy to replace traditional fossil energy and to seek harmony between man and the environment. For new, green, energy storage devices, while concerned about their greenness, high power density and high energy density are important indicators of whether they can truly replace traditional energy storage and transportation systems. New power supply systems, especially secondary batteries or supercapacitors are currently important ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01G11/24H01G11/30
Inventor 王华兰邬继荣蒋剑雄巩凯杨成董一帆张国栋来国桥
Owner HANGZHOU NORMAL UNIVERSITY
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