(001)-oriented nanosheet self-assembled three-dimensional VS2 microrod and preparation method thereof

Abstract

A preparation method of a (001)-oriented nanosheet self-assembled three-dimensional VS2 microrod comprises the following steps: simultaneously adding sodium metavanadate and thioacetamide into anhydrous ethanol to obtain a solution A; and pouring the solution A into a reaction liner, sealing the reaction liner, carrying out a hydrothermal reaction in a homogeneous reactor, naturally cooling the obtained reaction product to room temperature, taking out the obtained cooled reaction product, alternately cleaning the product with water and alcohol, collecting the product, and drying the product toobtain the (001)-oriented nanosheet self-assembled three-dimensional VS2 microrod. The center of the microrod is obtained through mutually interlacing large VS2 nanosheets in a radial form, the edgeof the microrod is formed by small flaky VS2 nanosheets, the nanosheets are monocrystalline structures and grow along the (001) crystal face orientation, the diameter of the microrod is 2-15 [mu]m, and the thickness of the nanosheets is 5-20 nm. The highly-pure three-dimensional self-assembled VS2 is synthesized through a one-step solvothermal technology. The method has the advantages of simple reaction process, low temperature, easiness in control, and no large devices or strict reaction conditions.

Description

technical field [0001] The invention relates to a three-dimensional self-assembled VS 2 And preparation method thereof, be specifically related to a kind of (001) oriented nanosheet self-assembled three-dimensional VS 2 Microrods and methods for their preparation. Background technique [0002] Transition metal dichalcogenides such as MoS 2 、WS 2 and VS 2 The large interlayer space of the layered structure makes them a very promising anode material for Na-ion batteries. Although recent studies have shown that MoS 2 and WS 2 They can exhibit excellent sodium storage properties, but poor electron transport caused by semiconducting limits their further development. As a typical member of the transition metal dichalcogenide family, the metallic state VS with excellent conductivity 2 It will exhibit excellent electron transport performance during cycling. At the same time, VS 2 The spatial distance between layers is It can provide sufficient space for the intercalation...

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Problems solved by technology

However, these materials have no effect on VS 2 The suppression of volume expansion occurs only in the direction of the contact point, resulting in an insignificant improvement in electrochemical performance

Currently VS 2 The preparation methods are mainly hydrothermal method and calcination method, the vanadium sources are mainly sodium orthovanadate and ammonium metavanadate, etc., and the morphology is mainly nano-flower-like (Wu Changzheng, Sun Xu, Xie Yi. A kind of preparation of vanadium disulfide The method of nanopowder: CN, CN102010004A[P].2011.), and mostly appear in the form of composite material (Zhong Mianzeng, Tang Xinping, Li Shushen, etc. A kind of vanadium disulfide / graphene composite material and its preparation method: , CN105355865A[P].2016.), in addition, these materials need to be prepared or purchased separately, which will make the whole synthesis process complicated, inefficient and costly

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