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A technology of molybdenum disulfide and composite materials, which is applied to fuel cell type half cells and secondary cell type half cells, electrical components, battery electrodes, etc. Improved catalytic activity, reduced agglomeration, high electrical conductivity
Active Publication Date: 2018-11-20
BEIJING NORMAL UNIVERSITY +1
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However, nanoparticles are easy to agglomerate, which greatly reduces the catalytic performance.
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[0036] Based on the above design idea, the present invention provides a method for preparing molybdenum disulfide / reduced graphene oxide / cobalt nanoparticle composite material, comprising:
[0038] (2), molybdenum source and sulfur source are mixed with graphene oxide dispersion liquid, obtain the first reaction mixture;
[0039] (3) The first reaction mixture is hydrothermally reacted at 180°C-220°C for 18-30 hours, separated and washed after the reaction, to obtain a molybdenum disulfide / reduced graphene oxide composite material;
[0040] (4), the molybdenum disulfide / reduced graphene oxide composite material is dispersed in an organic solvent to obtain a molybdenum disulfide / reduced graphene oxide composite material dispersion;
[0041] (5), after adding a cobalt source and hydrazine hydrate to the molybdenum disulfide / reduced graphene oxide composite material dispersion, adjust its pH...
Embodiment 1
[0062] Weigh 30 mg of graphene oxide, add 45 mL of twice distilled water (deionized water is also acceptable), and ultrasonically disperse for 10 minutes to obtain a graphene oxide dispersion.
[0063] Graphene oxide dispersion liquid is transferred in the 50mL reactor, adds 0.4g (1.7mmol) Na 2 MoO 4 2H 2 O and 0.63g (8.3mmol) thiourea were stirred for 10min to obtain the first reaction mixture.
[0064] The first reaction mixture was hydrothermally reacted at 200° C. for 24 hours. After the system was cooled to room temperature, it was centrifuged, washed with water and ethanol several times, and the obtained product was vacuum-dried at 50°C to obtain a molybdenum disulfide / reduced graphene oxide composite material, referred to as MoS 2 -rGO.
[0065] Weigh 16mg MoS 2 - Add 20 mL of ethylene glycol to rGO, and disperse evenly by ultrasonication for 10 minutes to obtain a molybdenum disulfide / reduced graphene oxide composite material dispersion.
[0066] Under magnetic s...
Embodiment 2
[0069] The difference between embodiment 2 and embodiment 1 is: the temperature of hydrothermal reaction is 180 ℃, and the reaction time is 30 hours.
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technical field [0001] The present invention relates to Li-O 2 The technical field of preparation of positive electrode catalysts for batteries, especially related to molybdenum disulfide / reduced graphene oxide / cobalt nanoparticle composite materials, their preparation methods and applications. Background technique [0002] The energy crisis has become one of the main problems in the current society, and it is imminent to seek a stable and efficient energy supply to meet the increasing energy demand of human beings. Lithium-ion batteries have been widely used in various mobile electronic devices as a new generation of green high-energy batteries since SONY Corporation of Japan commercialized them. In recent years, with the expansion of the application of lithium-ion batteries in power equipment, electric vehicles and other fields, the traditional lithium-ionbattery system has been unable to meet the needs of human beings. Li-O 2 Batteries (lithium-air batteries) have att...
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