Preparation method of porous carbon-loaded manganese dioxide nano material

Abstract

The invention discloses a preparation method of a porous carbon-loaded manganese dioxide nano material. The method comprises the following steps of performing grinding on porous carbon and potassium permanganate according to the mass ratio of 1:4 to 1:16, and dispersing in water, adding concentrated sulfuric acid, carrying out stirring and uniformly mixing, and then carrying out water bath heatingreaction to obtain the porous carbon-loaded manganese dioxide nano material. The method disclosed by the invention is simple and feasible, the physical properties of the synthesized nano material arerelatively stable, and the specific capacitance can reach 337 F / g; and when the nano material is used as a supercapacitor material, relatively high electrochemical performance is shown.

Description

technical field [0001] The invention belongs to the technical field of electrode material preparation, and relates to a preparation method of a porous carbon-supported manganese dioxide nanometer material. Background technique [0002] Supercapacitors have the advantages of high energy density, high power density and fast charging, and play an important role in the energy market. In supercapacitors, pseudocapacitors can obtain higher capacitance and energy density than electric double layer capacitors due to rapid redox reactions. Considering environmental friendliness, cost-effectiveness, and natural abundance, MnO2 has become a favored material among electrode materials for supercapacitors. Usually, graphene or carbon nanotubes are used as the supporting substrate of manganese dioxide, but their synthesis process is cumbersome and cannot be produced on a large scale, and the cost is also high. [0003] At present, the methods for synthesizing manganese dioxide composite ...

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Problems solved by technology

Chinese patent application CN108922790A synthesized a sodium ion-embedded manganese dioxide / nitrogen-doped porous carbon composite material by a redox method. This method first needs to synthesize a carbon precursor, then calcinate at a high temperature to obtain porous carbon, and finally pass a long period of time. Synthesis of composite materials by oxidation-reduction reaction, this method has a long experimental cycle and cumbersome steps, and the synthesized material has a low capacitance, only 217F / g

Chinese patent application CN105390697A adopts the electrodeposition method to load manganese dioxide on the surface of porous carbon. This method consumes a lot of energy and requires many conditions to be adjusted, such as the reaction system pH, current density, temperature, constant current or pulse electrolysis time and other parameters. need precise regulation

Chinese patent application CN102664277A adopts the hydrothermal method, but the hydrothermal method requires high temperature and takes a long time; in addition, the water bath method is also used, but MnCl needs to be added during the synthesis process 2 4H 2 O, and manganese, as a heavy metal, is harmful to the environment

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