Preparation method of nitrogen-oxygen co-doped porous carbon/ferroferric oxide composite material and application of nitrogen-oxygen co-doped porous carbon/ferroferric oxide composite material in supercapacitor electrode

Abstract

The invention relates to a preparation method of a nitrogen-oxygen co-doped porous carbon / ferroferric oxide composite material. The method comprises the following steps of (1) weighing certain parts by weight of cyclopentadienyl iron, hexachlorobutadiene and pyridine, adding the cyclopentadienyl iron, the hexachlorobutadiene and the pyridine to a polytetrafluoroethylene reactor tank and mixing; (2) sealing the polytetrafluoroethylene reactor tank, putting the polytetrafluoroethylene reactor tank into a high temperature reactor, tightening a reactor cover, and putting the reactor into an oven to react at 180-220 DEG C for 6-24h; (3) cooling to a room temperature, opening the reactor, putting a product into the oven and drying at 120 DEG C for 6h; and (4) putting a moderate amount of sampleinto the middle part of a quartz tube of a tube furnace, introducing argon, evacuating the air in the tube, slowly heating the tube furnace at a heating rate of 10 DEG C / min, maintaining the temperature for 60-120min, automatically cooling an instrument, cooling and closing the gas to obtain the nitrogen-oxygen co-doped porous carbon / ferroferric oxide composite material. The nitrogen-oxygen co-doped porous carbon / ferroferric oxide composite material has excellent electrical property, is used for preparing a supercapacitor electrode, and has great potential in the field of electrochemistry.

Description

technical field [0001] The invention provides a composite material and its preparation method and application, specifically, a preparation method of a nitrogen-oxygen co-doped porous carbon / ferric oxide composite material and its application in supercapacitor electrodes, The invention belongs to the technical field of inorganic functional materials and electrochemical energy. Background technique [0002] In the current information age, people have higher requirements for energy storage devices. As an energy storage device, supercapacitors have relatively simple working principles, high charge and discharge rates (power density), good stability and Therefore, it has become the object of extensive attention and research. [0003] But compared with lithium battery, the energy density of supercapacitor is still relatively small (Science, 2008.321(5889):pp.651-652.), its energy density can pass E=0.5CU 2 Calculate (C: specific capacitance, unit F / g; U: voltage, unit V), so whe...

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Problems solved by technology

[0004] Although carbon materials have many advantages such as good electrical conductivity and chemical stability, low price, simple preparation, and environmental friendliness, their specific capacitance is only 200 F / g at the highest, and their tap density is low, resulting in low volume specific capacitance. , thus limiting its wide application

The specific capacitance of ruthenium dioxide in transition metal oxides is very high, but the high price of ruthenium limits its wide application in commercial production

Although conductive polymers have the advantages of cheap price, easy preparation, and high Faraday quasi-capacitance, their chemical stability is poor and their capacitance decays quickly.

It can be seen that when different types of electrode materials are used alone, there are disadvantages such as poor conductivity, high cost, low specific capacitance, and poor cycle stability.

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