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Nitrogen-doped graphene hollow microsphere (NGHM) preparation method

A technology of nitrogen-doped graphene and hollow spheres, applied in electrical components, battery electrodes, circuits, etc., can solve the problems of cumbersome steps and achieve unique hollow structure, high stability and toxicity resistance, good stability and toxicity resistance Effect

Inactive Publication Date: 2016-01-13
SHANGHAI UNIV
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  • Application Information

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Problems solved by technology

[0004] At present, the nitrogen-doped graphene hollow sphere materials used in the oxygen reduction cathode of fuel cells mostly use silicon dioxide as the template, which needs to be etched with HF to remove the template, and the steps are cumbersome

Method used

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  • Nitrogen-doped graphene hollow microsphere (NGHM) preparation method
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  • Nitrogen-doped graphene hollow microsphere (NGHM) preparation method

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Experimental program
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Embodiment 1

[0016] Embodiment one: concrete steps are as follows:

[0017] 1) Preparation of graphene: Prepared by the Hummers method and obtained a highly dispersed oxygen-reduced graphene GON with a solid content of 0.1 mg / mL through ultrasound;

[0018] 2) Mix 4mL commercial polystyrene microspheres (Aladdin Reagent (Shanghai Co., Ltd.)) with 100mL GON dispersion, add 500mL distilled water, and stir overnight;

[0019] 3) Add 3 g of melamine to the mixture in step 2), stir overnight, and freeze-dry;

[0020] 4) The product in step 3) was calcined at 800°C under the protection of nitrogen gas, kept for 2 hours, and naturally cooled to room temperature to obtain NGHM. figure 1 is the transmission electron microscope image of NGHM, figure 2 It is the X-ray photoelectron spectrum of NGHM, which proves that NGHM is a hollow spherical structure doped with nitrogen.

[0021] 5) Using Hg / HgO as the reference electrode, platinum wire as the counter electrode, NGHM-modified glassy carbon e...

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Abstract

The invention relates to a nitrogen-doped graphene hollow microsphere (NGHM) preparation method. Polystyrene microspheres as templates, graphene as a carbon source and melamine as a nitrogen source are calcined to form NGHM. The prepared NGHM has good oxygen reduction reaction (ORR) catalytic performances. Compared with the commercial Pt / C catalyst, the NGHM has slightly lower OPP onset potential and the same ORR limiting current density. Compared with Pt / C, the NGHM has higher stability and toxicity resistance and has a lower cost. The prepared NGHM can completely replace the commercial Pt / C.

Description

technical field [0001] The invention relates to a preparation method of a nitrogen-doped graphene hollow sphere with excellent electrocatalytic oxygen reduction performance. Background technique [0002] With the rapid development of industry, people's demand for energy is increasing day by day. As an efficient and clean electrochemical energy device, fuel cells have received widespread attention at home and abroad in recent years. The oxygen reduction reaction (ORR) of the cathode in fuel cells is one of the important factors affecting the battery performance. The current commercial Pt / C catalysts have many problems such as high cost, poor toxicity resistance, and short life, which limit the large-scale application of fuel cells. [0003] Nitrogen-doped carbon materials have attracted attention due to their low cost and good electrocatalytic ORR performance. Graphene, as a new type of two-dimensional carbon material, has been applied in various electrochemical fields. N...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/04H01M4/90
CPCH01M4/90H01M4/9083Y02E60/50
Inventor 施利毅颜蔚王令李爱军陈昶
Owner SHANGHAI UNIV
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