Preparation method for graphene-molybdenum disulfide-polyaniline ternary composite electrode material

Abstract

The present invention relates to the field of material science, and aims to provide a preparation method for a grapheme-molybdenum disulfide-polyaniline ternary composite electrode material. The method comprises the steps of dispersing graphene in deionized water, then dispersing molybdenum trioxide and potassium thiocyanate in deionized water, uniformly mixing up the above material, subjecting an obtained mixture to hydrothermal reaction, washing and drying an obtained precipitate to obtain substrate powders, placing substrate powders in dilute acid for ultrasonic dispersion, adding aniline monomer and an oxidizing agent, stirring uniformly, reacting at the room temperature, filtering, washing, and drying to obtain the ternary composite electrode material. The preparation method is simple in process and strong in operability. The temperature of the synthesis condition is wider in range, and the requirement on the substrate material is lower. Therefore, the preparation method is more suitable for industrial production. In the preparation field of super capacitor electrode materials, the preparation method has a wider application prospect. Based on the preparation method, electrode materials of uniform morphology and good electrochemical performance can be prepared. Meanwhile, a high electrical double-layer capacitor and a pseudo capacitor can be obtained simultaneously. As a result, the cycle performance is more excellent.

Description

Technical field [0001] The invention relates to the field of materials science, in particular to a method for preparing a graphene-molybdenum disulfide-polyaniline ternary composite electrode material for supercapacitors. Background technique [0002] The development of high-performance energy storage devices is a huge challenge in response to today's environmental degradation and exhaustion of fossil energy. Supercapacitors, also known as extreme capacitors or electrochemical capacitors, are divided into electric double layer capacitors based on carbon materials and pseudocapacitors (Faraday capacitors) based on transition metal oxides or sulfides and conductive polymers. Its energy density is hundreds of times that of traditional capacitors. It has excellent characteristics such as fast charge and discharge rate, wide temperature adaptation range, long cycle life, and no pollution, which has attracted wide attention from researchers. [0003] At present, among the electrode mate...

AI Technical Summary

Problems solved by technology

[0003] At present, among the electrode materials used for supercapacitors, the carbon materials represented by graphene have high specific surface area and stability, high reversibility in charge and discharge cycles, and long life. It is easy to reunite between layers; transition metal oxides can obtain higher pseudocapacitance than electric double layer capacitance, excellent electrical conductivity, and have very good application prospects, but the high price limits its commercial development

At present, the emerging transition metal sulfides with similar structures to graphene, especially molybdenum disulfide, which has been studied more now, have high specific surface area and excellent cycle stability, but they have poor electrical conductivity and are also easy to agglomerate.

[0004] Compared with the first two types, conductive polymers such as polyaniline with the best conductivity have the advantages of short charge and discharge time and low cost, but after multiple charge and discharge cycles, the cycle stability and related electrochemical properties are not good. The current method of synthesizing conductive polymers is mainly in-situ polymerization and electrochemical deposition at low temperature, and the process conditions are relatively harsh, which further limits its industrial production.

Images