The Preparation And Fundamental Application Of Porous Carbon Nano Materials

With the development of society,there are increasing number of problems to be solved in the future environment and energy.Porous carbon materials show high application value in the fields of chemical industry,medicine and optoelectronics devices,which possess the advantages of high specific surface area,good conductivity,physical and chemical stability.Along with the advance of research,it is still a hot topic to explore new preparation method of porous carbon materials and to construct porous carbon materials with new properties and adjustable pore size.Graphene is a new type of 2D carbon material with excellent performance.The porous 3D graphene materials obtained by the self-assembly method of graphene oxide as raw materials have great applications in the field of environment and energy.However,3D graphene materials reported in the previous literature are constructed through covalent or weak non-covalent interactions,causing permanent structure/property changes and limiting their applications in controlled release,intelligent response and other fields.Through the modification of graphene oxide,a dynamic quadruple hydrogen bond is introduced on the layer of graphene oxide,and the porous graphene constructed by this self-assembly can respond to the external stimulus in a timely manner.Furthermore,its application in dye adsorption is explored.The pore size distribution of porous carbon materials determines their potential applications.It is of great practical significance to adjust the pore size of porous carbon materials,especially in the ultra-microporous range less than 0.7 nm.The ultra-microporous carbon material obtained through this design can effectively accommodate smaller linear S_2-4 molecules as a skeleton and fundamentally suppress the shuttle effect in the Li-S battery.In this paper,a ultra-microporous carbon material with narrow sieze distribution is obtained by a KOH etching method using a biomass-Macadamia Nut Shell as precursor,which was further applied in the cathode material of Li-S battery as a skeleton of S_2-4.Therefore,the electrochemical performance was much improved.Furtherfore,the influence of different S loading on electrode reaction mechanism was studied by changing the technological conditions.On the basis of the previous research,the porous carbon materials with different pore size distribution were obtained by adjusting the drilling technology,and the porous carbon films with self-supporting characteristicare were prepared and applied as the interlayer of the Li-S battery,which greatly improved the actual performance of the battery.The influences of different pore structures on the adsorption of lithium polysulfide and electrochemical properties were studied.These work all pave the way for the study of subsequent porous carbon materials with new properties.