Preparation method and application of a vanadium tetrasulfide@super P composite powder

Abstract

A method for preparing vanadium tetrasulfide@Super P composite powder, comprising the following steps: Weigh 48-52 mg of Super P and add it to 58-62 ml of deionized water, and ultrasonically for 1.5-2.5 hours to obtain uniformly dispersed black solution A; Take 0.9 ~ 1.1g of sodium metavanadate and 3.5 ~ 3.7g of thioacetamide and add them to solution A at the same time, stir magnetically for 30 ~ 60min to obtain solution B; pour solution B into the reaction liner and seal it, then put the inside The lining is fixed in the external kettle and placed in a homogeneous reactor, and then reacted at 175-185°C for 23-25 ​​hours at a speed of 5-10r / min; after the hydrothermal reaction is completed, the reactor is naturally cooled to room temperature, then take out the cooled product after the reaction, and collect the product after 2-5 times of water and 2-5 times of alcohol alternate washing; place the collected product in the cold well of the freeze dryer for freezing, and then freeze the frozen product Place it in a tray, cover with a sealing cover, vacuumize to 10-20Pa, dry for 12-18 hours and collect the product. The invention has the characteristics of simple reaction process, low temperature, easy control and no need for large-scale equipment and harsh reaction conditions.

Description

technical field [0001] The invention relates to the technical field of vanadium tetrasulfide@Super P composite powder, in particular to a preparation method and application of vanadium tetrasulfide@SuperP composite powder. Background technique [0002] As a typical transition metal sulfide, VS 4 Has a one-dimensional chain structure. Among them, two S 2 2- The group (four S) tightly surrounds V and expands along the c direction to form VS 4 Molecular chain, two adjacent VS 4 The molecular chains are connected by weak van der Waals force, and the distance between the chains can reach (Rout CS, Kim B-H, et al. J Am ChemSoc. 2013, 135:8720-8725.). Similar to FeS 2 , VS 4 It is derived from the natural mineral green sulfur vanadite, and the valence state of S is -1, and the valence state of V is +4. The above structural properties make VS 4 It has been applied in photocatalysis, hydrorefining reaction, lithium ion battery, supercapacitor, aluminum ion battery, magnesi...

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Problems solved by technology

However, in the composite materials that have been reported above, a part of VS 4 Not grown on the carbon material surface, only for VS 4 Composite with carbon materials, although the other part grows on the surface of carbon materials, but the distribution is relatively sparse and irregular, and VS 4 The shape is also irregular and uniform

This inadequate and inefficient recombination makes VS 4 The high performance of the

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