Preparation method of molybdenum oxide/ molybdenum disulfide core-shell microspheres

Abstract

The invention relates to a preparation method of molybdenum oxide/ molybdenum disulfide core-shell microspheres, and belongs to the technical field of nanometer composite materials. The method comprises the following steps: (1) feeding a molybdenum source into a tubular furnace; oxidizing and roasting under high temperature in an air atmosphere to obtain molybdenum oxide particles; (2) adding ureaand a sulfur source into ethyl alcohol; stirring until the solution is clear; then adding the molybdenum oxide particles; ultrasonically and uniformly stirring; and transferring into a water heatingreaction chamber; and (3) centrifuging the reacted product; washing; and drying in vacuum to obtain the molybdenum oxide/ molybdenum disulfide core-shell microspheres. The method is simple in synthesizing line and easy to operate; additional sacrifice templates and catalysts are avoided; meanwhile, the prepared microspheres are regular in appearance, and uniform in size, and are independently scattered without agglomerating; and the microspheres can be widely applied to the fields of catalyzing, batteries, capacitors and lubrication.

Description

technical field [0001] The invention belongs to the field of nanocomposite functional materials, and in particular relates to a preparation method of molybdenum oxide / molybdenum disulfide core-shell microspheres. Background technique [0002] As a remarkable two-dimensional nanomaterial, molybdenum disulfide (MoS 2 ) have been widely used in batteries, photoelectricity, catalysis and other fields. Theoretical studies and experimental results suggest that single-layer or few-layer MoS 2 than ordinary MoS 2 blocks exhibit higher reactivity due to the majority of active sites on MoS 2 , whose base behaves inertly. The two-dimensional layered MoS 2 tends to form a closed structure, and the layers tend to be stacked, which leads to the reduction of exposed edge active sites, making MoS 2 The reactivity is severely reduced. MoS 2 The reactivity of MoS strongly depends on its structure, shape and size, and MoS with controllable shape, structure and size 2 Nanomaterials hav...

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Problems solved by technology

[0003] Zhang et al. prepared MoS by facile chemical vapor deposition (CVD) 2 Deposited on the surface of three-dimensional graphene, thus effectively avoiding the MoS 2 The stacking of layers, the prepared composite three-dimensional material exhibits excellent electrochemical performance, and the prepared lithium-ion battery electrode has a high capacity and outstanding cycle stability (small 2013, 9, No. 20,3433–3438), but this method has high requirements for CVD technology, and the process is complex and difficult

Afterwards, Chang's group proposed a hollow MoS 2 The preparation method of nanocages, ammonium tetrathiomolybdate is reduced under the strong reducibility of its hydrazine to generate ammonia gas, and with its assistance, the hollow MoS 2 Nanocages can be formed (J. Mater. Chem. A, 2016, 4, 51–58), however, this method requires the help of the strong reduction of hydrazine, and the large amount of ammonia generated during the preparation process is harmful to the staff and the environment. harmful

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