Study On The Structure Regulation And Properties Of Polymer Matrix Porous Carbon

Carbon materials have high specific surface area,developed porous structures,good thermal stability and conductivity,which make them widely used in electrochemical,catalysis,adsorption,nanomedicine and other aspects.Now it is difficulty to develop a green,environmentally friendly and simple synthesis process.In this paper,phenolic resin was used as raw material to prepare porous carbon materials with controllable structures from carbon foam monoliths to a carbon nanospheres using simple and gentle processes synthesis.1.We report a nitrogen-doped and nanofiber-based porous carbon foam produced via an efficient and facile self-foaming approach and its subsequent pyrolysis;in this approach,carbon dioxide-rich ethanolamine serves as the foaming agent,N source and polymerization catalyst.Meanwhile resorcinol and formaldehyde are used as carbon sources.Carbon dioxide-rich ethanolamine plays a crucial role in the release of gas as well as initiating polymerization on the interfaces of bubbles,which directs the formation of polymer foam.The N-doped carbon foam can be a highly active metal-free heterogeneous catalyst to promote selective oxidation of the benzyl group to the corresponding phenone.In addition,the carbon foams are easily cast with different morphologies.Notably,the prepared carbon foam is fabricated as a monolithic reactor for the oxidation reaction,which also exhibits good catalytic performances in the scale-up experiment.This study provides a reliable and facile route to prepare doped carbon-based metal-free catalysts with superior catalytic properties.2.Monodisperse,honeycomb-like,mesoporous carbon nanospheres were synthesized by self-assembly of resorcinol,formaldehyde and commercial silica sol.The size of the nanospheres is about 150 nm,and they show a mesopore size distribution of 15 nm.By controlling the solid content,the morphology of materials can be converted from nanosphere to monolith.The carbon nanospheres exihibite excellent photothermal properties,which can increase the temperature of the carbon ball solution within a certain concentration gradient of 20 ?g/ml to 1mg/ml quickly under the irradiation of 808 nm laser.It has good biocompatibility and phototoxicity when applied to cells.This material has a broad development prospect in biotherapy.3.The polymer was synthesized from phenolic amine,and the polymer was further coated with ZIF-67 to obtain carbon spheres with different morphologies.On the basis of carbon spheres,melamine was used to grow carbon nanotubes.The hollow and core-shell carbon spheres were obtained by controlling the synthesis time,and the polymers with different densities were synthesized.Carbon spheres and carbon spheres/carbon nanotube complexes were applied to the ORR electrocatalytic activity,showing high oxidation activity and a semi-potential of 0.78 V.Carbon composite microspheres with controllable internal structure and uniformly distributed carbon nanotubes on external surface are obtained.Resorcinol-glutaraldehyde resin nanospheres is used as substrates with ZIF-67 is evenly coated on their surface as RF@ZIF-67.After carbonization,carbon nanospheres with controllable internal structure are obtained.Carbon nanotubes are grown on the surface of the carbon spheres,using the cobalt nanoparticles formed during the carbonization process as catalysts.The density distribution of the polymer spheres could be changed by adjusting the aging temperature and aging time during the growth of the polymer.So,we could control their internal structure by solvent etching different polymer spheres with different aging process,to obtain the core-shell and the hollow carbon nanospheres.The ORR material has excellent electrocatalytic performance.Among them,the ORR starting potential and half-wave potential of CNT / CS-600 are 0.89 V and 0.79 V,respectively.This may be because the nitrogen-doped structure and carbon nanotubes make the carbon composite material have excellent conductivity,and the cobalt nano metal particles provide charge and transport channels,thereby improving the utilization of nitrogen-doped carbon active sites,making their performance comparable with that of commercial Pt/C catalysts.