A Rapid Microwave-assisted Thermolysis Route To Low Dimensional Graphite Phase Carbon-based Materials And Their Properties

For many years,the conventional heating methods for graphite phase carbon-based materials have the disadvantages of high energy consumption,long time-consuming,and harsh atmosphere requirements,so it is difficult to synthesize graphite phase carbon-based materials with high performance on a large scale.While continuously modulating,doping and compounding carbon-based materials to enhance their performance,finding a new synthesis method has also become one of the effective means for researching and developing carbon-based materials.Microwave synthesis methods that directly heat the reaction system through microwaves have gradually entered the field of view of researchers.In this paper,the microwave method was used as the main synthesis method,exploring respectively the effects of the microwave method in the g-C₃N₄ and the carbon nanotube system.Combined with characterization and performance tests,the structure of the synthesized graphite phase carbon nitride and carbon nanotube materials were studied,and the excellent application prospects of the microwave method were verified.The microwave method was used to synthesize g-C₃N₄ photocatalyst.The homemade microwave reaction system was perfected,and g-C₃N₄ photocatalyst with higher crystallinity was synthesized.By comparing the structure,morphology,and performance of the g-C₃N₄ photocatalyst prepared by the microwave method with the conventional heating method,it is initially proposed that the microwave method can effectively improve the reaction efficiency,reduce the reaction cost,and help to prepare the g-C₃N₄ photocatalyst with more uniform morphology and better crystallinity because of the material itself,the microwave field and the unique heating method.Besides,the microwave method can effectively reduce the structural defects of the g-C₃N₄ photocatalyst itself,increase the utilization of its photo-generated carriers and ultimately increase the hydrogen production activity of the g-C₃N₄ photocatalyst.The microwave method was applied to different precursors,and the g-C₃N₄ photocatalyst was successfully prepared,proving that the microwave method had a good universality.Using microwave reaction system that have been successfully explored,microwave synthesis of carbon nanotubes was accomplished,and pure-phase oxygen-nitrogen co-doped bamboo-like carbon nanotubes were successfully prepared.The influence of the conditional factors such as the percentage power of the reaction,the reaction time and the type of catalyst on the structure and microscopic morphology of the synthesized carbon nanotubes was systematically studied.Combined with the characterization test and the performance test,the role of the microwave method in the synthesis of carbon nanotubes was further explored,and the carbon nanotubes were tested for their lithium performance.The microwave method can effectively increase the degree of graphitization of the carbon nanotubes in the carbon nanotube system,thereby improving the conductivity of the carbon nanotubes and facilitating the improvement of the lithium-carbon performance of the carbon nanotubes.In different catalyst systems,the microwave meth od can be used to prepare successfully carbon nanotubes.In the actual industrial production applications in the future,the synthetic cost of low-dimensional graphite phase carbon-based materials can be greatly reduced and its synthesis efficiency would be improved through microwave method,so the microwave method must have a good application prospects.In addition,the microwave method can effectively retain the inherent characteristics of the carbon-based materials prepared by the conventional heating method,which has great advantages in replacing traditional heating methods.Furthermore,the degree of ordering of the carbon-based material increases as it is formed by microwave,which can effectively increase the degree of graphitization or crystallini ty of the low-dimensional carbon-based material,thereby reducing uncontrollable structural defects of the material itself and improving the performance of low-dimensional carbon-based materials in various fields.Finally,the microwave method has a very good universality.The application of the microwave method to different systems can successfully produce a product similar to the traditional heating method,and this product can have excellent performance in its application field.