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Nitrogen-doped graphene/cobaltous oxide composite material and preparation method thereof

A technology of cobaltous oxide composite materials and nitrogen-doped graphene, which is applied to electrical components, battery electrodes, circuits, etc., to achieve the effects of improving catalytic efficiency, improving electrical conductivity and stability, and improving catalytic efficiency of oxygen reduction reaction

Active Publication Date: 2018-05-18
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Due to the limitation of platinum resources in the world, the large-scale development of platinum-based fuel cells is limited by resource and cost issues.

Method used

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  • Nitrogen-doped graphene/cobaltous oxide composite material and preparation method thereof
  • Nitrogen-doped graphene/cobaltous oxide composite material and preparation method thereof
  • Nitrogen-doped graphene/cobaltous oxide composite material and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0039] A kind of nitrogen-doped graphene / cobaltous oxide composite material, its preparation method comprises the steps:

[0040] 1) Add 100 mg of graphite oxide into deionized water, ultrasonically disperse for 1 hour, stir for 0.5 hour, and then ultrasonically disperse for 1 hour to form a GO dispersion;

[0041] 2) Dissolve 100mg of cobalt acetate tetrahydrate and 4g of ammonium carbonate in deionized water to prepare a homogeneous aqueous solution. Add the prepared cobalt acetate solution and ammonium carbonate solution to the GO dispersion and stir for 0.5h. The resulting mixed solution (The concentration of graphene oxide is 0.5mg / ml) into a 500ml two-necked flask, put the flask into a water bath preheated to 80°C, continue to stir and condense and reflux for 10h; after the water bath is over, take out the flask and continue to stir And let the solution cool down naturally; put the cooled solution into the polytetrafluoroethylene liner, put the liner into the reaction ke...

Embodiment 2-4

[0048] The preparation method of nitrogen-doped graphene / cobaltous oxide composite material described in embodiment 2-4 is roughly the same as embodiment 1, and difference is: the consumption of ammonium carbonate in step 2) is respectively 1g (embodiment 2), 2g (Example 3) and 3g (Example 4).

Embodiment 5-8

[0051] Other parameter steps of embodiment 5-8 are identical with embodiment 1, difference is: in the step (2), the consumption of tetrahydrate cobalt acetate is respectively 150mg (embodiment 5), 200mg (embodiment 6) 250mg (embodiment 7 ) and 300 mg (Example 8).

[0052] Comparing Example 1 with Examples 5-8, the results show that too much content of cobaltous oxide will affect the electrical conductivity of the composite material and affect the enhancement trend of the oxygen reduction catalytic performance of the composite material.

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Abstract

The invention discloses a nitrogen-doped graphene / cobaltous oxide composite material. Graphite oxide, a cobaltous acetate solution and ammonium carbonate are taken as the main raw materials, and cobaltous oxide is loaded on nitrogen-doped graphene by adopting a water bath-hydrothermal-calcining method to obtain the nitrogen-doped graphene / cobaltous oxide composite material. Compounding of nitrogen-doped graphene and cobaltous oxide is proposed initially in the invention, the obtained composite material is high in cobaltous oxide purity, and a synergistic effect between cobaltous oxide and nitrogen-doped graphene can be achieved, so that an excellent catalytic ability on a fuel cell negative electrode oxygen reduction reaction can be achieved; meanwhile, the material cost of a catalyst is greatly lowered; and the involved preparation method is simple, high in repeatability and suitable for popularization and application.

Description

technical field [0001] The invention belongs to the technical field of inorganic functional materials, and in particular relates to a nitrogen-doped graphene / cobaltous oxide composite material and a preparation method thereof. Background technique [0002] With the development of society, non-renewable energy sources such as coal and oil are decreasing day by day, and the extensive use of fossil energy has also caused various environmental problems and hindered the development of human society and economy. Therefore, it is very necessary to find new clean energy. Fuel cells can directly convert chemical energy into electrical energy without being limited by the Carnot cycle, and have high energy conversion efficiency. It is considered to be one of the new environmentally friendly and efficient power generation technologies in the 21st century. [0003] Since the fuel cell converts chemical energy into electrical energy through the chemical reaction of the cathode and anode ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/90H01M4/88
CPCH01M4/8825H01M4/9083Y02E60/50
Inventor 涂文懋付占明
Owner WUHAN UNIV OF TECH
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