Solvothermal method for preparing three-dimensional nanometer layered structure WS2 and electrochemical application thereof

Abstract

The invention relates to a solvothermal method for preparing a three-dimensional nanometer layered structure WS2 and an electrochemical application thereof. The method comprises the following steps: adding tungstic acid and S powder into a mixed solution of octylamine and n-hexyl alcohol, and rapidly stirring at room temperature, so that the components are fully mixed; transferring the fully stirred mixed solution into a hydro-thermal synthesis reactor, reacting under the constant temperature of 180-240 DEG C for 24 hours, filtering and collecting the reaction solution after the reaction solution is cooled to room temperature, cleaning by using ethanol and deionized water, drying, and performing heat treatment on the obtained solid products in a nitrogen atmosphere under the condition of 400-750 DEG C for 2 hours, thereby obtaining the three-dimensional nanometer layered structure WS2. The three-dimensional nanometer layered structure WS2 is applied to lithium ion battery and electro-catalysis hydrogen evolution reaction, good electrochemical performance can be obtained under the condition that mixing and coating are absent, and when the current density is 20mA / g, the discharge capacity of the lithium battery is 468mAh / g; and moreover, a hydrogen evolution initial potential more correct than WS2 in the prior art is obtained under the scanning speed of 10mV / s.

Description

technical field [0001] The invention belongs to the field of new energy materials and their applications, and relates to the preparation of three-dimensional nano-layered structure WS by solvothermal method 2 and its electrochemical applications. Background technique [0002] The inorganic layered material tungsten disulfide has been widely used in solid lubricants or lubricating oil additives due to its special microstructure and composition. In addition, tungsten disulfide also has broad application prospects in catalysts, lithium batteries, hydrogen storage, and electrochemistry. [0003] Lithium-ion batteries are a new generation of chemical power sources. Compared with traditional carbon batteries, alkaline batteries and lead-acid batteries, lithium-ion batteries have obvious advantages, such as high voltage, high specific energy, low self-discharge rate, cycle performance so wait. Moreover, as the best mobile energy storage device in the consumer electronics market ...

AI Technical Summary

Problems solved by technology

The CVD method uses chemical vapor deposition equipment, which has high cost, harsh conditions and low yield; both chemical stripping and physical stripping methods require the preparation of commercial WS 2 The sample is subjected to long-term low-power ultrasonic treatment, which has low efficiency and extremely low yield; while in the solid-phase method, the tungsten source and the sulfur source are placed in an inert environment for a high temperature and long-term reaction to obtain flake WS 2 , but the reaction has high energy consumption and may have sulfur vapor and SO 2 gas generation; in addition, hydrothermal methods typically use tungsten hexachloride (WCl 6 ) and thioacetamide (TAA), the reaction temperature is usually 265 ° C, the reaction time is 24h or even longer, the reaction process has SO 2 Generated, and ultra-high temperature water heat has a certain risk

Images