Bacterial cellulose/manganese dioxide/polypyrrole composite film and preparation method thereof

Abstract

The invention discloses a bacterial cellulose / manganese dioxide / polypyrrole composite film and a preparation method thereof. The composite film is prepared by soaking bacterial cellulose in alkali, performing impurity removal and pretreatment, adding potassium permanganate and pyrrole, performing oxidization and reduction to obtain manganese dioxide and polypyrrole, and finally performing suction filtration. According to the bacterial cellulose / manganese dioxide / polypyrrole composite film, polypyrrole which is high in air stability, can be easily prepared into a film in an electrochemical way and is low in poison is utilized, and manganese dioxide which shows high capacitive property in neutral aqueous electrolyte under a wider potential window, and high-strength material bacterial cellulose are compounded, so that the method is simple and feasible. Polypyrrol is loaded on bacterial cellulose, so that the conductivity of the film is improved; meanwhile, manganese dioxide has high capacitive property, so that the electrical property of the composite film is further improved. The bacterial cellulose / manganese dioxide / polypyrrole composite film can be applied to the fields of lithium ion battery cathode materials, supercapacitors, electronic devices and biological sensor wrapping materials.

Description

Technical field [0001] The invention relates to a bacterial cellulose / manganese dioxide / polypyrrole composite membrane and a preparation method thereof, and belongs to the technical field of material preparation. Background technique [0002] Cellulose is mainly derived from photosynthesis, artificial synthesis and bacterial fermentation of plants. The cellulose synthesized by plant photosynthesis is accompanied by lignin and semi-fiber impurities, and needs complicated pretreatment before it can be used. The synthetic cellulose has low utilization rate due to its low degree of polymerization. Bacterial cellulose (BC) is a bacterial secretion, which is formed by the condensation of simple glucose, with high fiber content and polymerization degree, and no impurities such as lignin. [0003] In recent years, various methods have been used to compound bacterial cellulose and conductive materials, such as doping, surface coating, and in-situ culture. Literature 1 (HaihuaWang, etc.. ...

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Problems solved by technology

Document 1 (HaihuaWang, etc..Preparation and characterization of polypyrrole / cell-ulosefiberconductivecomposites doped with cationic polyacrylate of different charge density. Cellulose, 2015, 22:3305–33) reported a cationic polyacrylate as a dopant, FeCl 3 As an oxidant, the method of doping polypyrrole and cellulose together, the prepared micron-scale composite material has good conductivity, but the operating conditions are not easy to control, the degree of compounding is not high, and the strength of the material is not good. Large energy loss

Chinese patent 201310280034.6 discloses a preparation method of polypyrrole PPy nanocellulose NCCs composite membrane electrode material, the plant cellulose is sequentially dissolved in NaOH, NaClO and H 2 SO 4 Heating in solution and electrolytic reaction to prepare composite film, however, this method uses plant cellulose, the pretreatment is complicated, repeated heating and electrolysis are required, high energy consumption, many influencing factors, and difficult to control

Chinese patent application 201510323596.3 discloses a manganese dioxide / nitrogen-doped carbon fiber negative electrode composite material for sodium-ion batteries and its preparation method. After bacterial cellulose is carbonized by heat treatment, potassium permanganate and nitrogen-containing compounds are added to obtain a compound containing two Conductive composite film of manganese oxide, but manganese dioxide only adheres to the surface of bacterial cellulose, and fails to produce a coating effect. At the same time, the carbonized bacterial cellulose loses its original strength, and the film is easily broken

[0004] To sum up, the existing cellulose conductive composite films have unsatisfactory conductive effects, the doping amount is not easy to control during the composite process, and there are problems such as poor mechanical strength and not suitable for later application. Therefore, a kind of doping effect is developed. Composite membranes with excellent mechanical strength are necessary

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