Preparation And Electrochemical Properties Of Carbon Nanocomposites

Carbon based nanocomposites have attracted great attention in catalysis,drug adsorption and desorption and electrochemical supercapacitors due to their unique advantages such as well-developed pores,high specific surface area and abundant characteristic structures.At present,with the in-depth research of carbon-based nanocomposites,the energy conversion and storage problems are becoming more and more serious,making the research and exploration of carbon-based nanocomposites in the electrochemical direction of supercapacitors more broad,and it has become a current hot topic.In this paper,three types of porous carbon-based nanomaterials with different morphologies have been prepared by template method,interface assembly,and catalytic directional growth,through material performance test and electrochemical performance test,whether the obtained three types of carbon materials can be the electrochemical performance has reached the application level,and detailed exploration has been carried out.The main research direction and content of the article are as follows:1)Using surfactant-assisted supramolecular micelle interface control assembly method.Firstly,an effective template Mg（OH）₂ nanosheet interface is prepared,and by adjusting the ratio of the carbon source to the template,an ordered and densely arranged mesoporous carbon nanosheet structure is obtained.The carbon nanosheets have a high specific surface area of 865.9 m²·g^-1,a sheet-like morphology and a rich interconnected pore structure,which can shorten the ion transmission distance and provide abundant active center sites.When used as an electrode material,the specific capacitance of MP/Mg（OH）₂-1.5 is as high as 266 F·g^-1 at 1 A·g^-1;at the same time,MP/Mg（OH）₂-1.5also shows a relatively stable cycle stability the initial capacitance retention rate at 10 A g^-1 is 73.4%,which makes the supermolecular micelle interface controlled assembly method assisted by surfactants provide a new idea for the preparation of two-dimensional thin-layer porous carbon materials.2)The interface co-assembly method is used to assemble graphene oxide,resorcinol-formaldehyde resin nanospheres,and ethyl orthosilicate（TEOS）under the action of tyrosine to obtain a core-shell structure,uniform mesoporous distribution,and the new two-dimensional carbon nanosheets with high specific surface area and appropriate N doping content are supported on carbon nanocomposites with core-shell nano-mesoporous spheres.As an electrode material,it has a high initial reversible specific capacitance value of 291 F·g^-1 at 1 A·g^-1,and has an ultra-long cycle life of 10 000 cycles at a current density of 5 A·g^-1,and the capacity retention rate is 96.24%,laying the foundation for the application of this material in high-performance supercapacitors,energy conversion,catalysis and energy storage.3)The method of metal catalysis-high temperature pyrolysis is used to obtain Co-N coordination combination,which further catalyzes the pyrolysis process,which induces the emergence of MOFs-based ZIF-8 derivatives N-CNTs,and obtains multiple N-CNTs the appearance of staggered existence.The obtained carbon nanomaterial has a rich specific surface area(913 m²·g^-1)and a pore volume of 0.9 cm³·g^-1.When ZIF-8@m Si O₂-NH₂ is used as a supercapacitor electrode material,in the three-electrode test,when the current density is 1 A·g^-1,the electrode material has a high specific capacitance of 248.2 F·g^-1.By introducing metal ions to enhance the coordination effect,achieve the purpose of catalytic enhancement,and promote the rapid formation of N-CNTs during the high-temperature pyrolysis process.This research can effectively open up a new way for the new type of MOF-derived carbon nanotubes.And it provides a cheap choice for precious metal-based catalysts in renewable energy technology.