Research Of The Preparation And Performace Nitrogen And Phosphorus Co-doped Graphene

We introduce two works about nitrogen and phosphorus co-doped graphene and its use as high-performance electrocatalyst for oxygen reduction reaction and a large-area, flexible, and flame retardant graphene paper.In this study, N/P co-doped graphene(NPG) was prepared by a one-step pyrolysis using a mixture of graphene oxide and hexachlorocyclotriphosphazene(HCCP), in which HCCP is used as both the N and P source. NPG-1000 shows a more positive onset potential of-0.05 V than most of reported metal-free electrocatalysts. Furthermore, it is shown that NPG electrodes, as efficient metal-free electrocatalysts, have a high current density, and long-term stability for the oxygen reduction reaction. The as-obtained materials show the potential to be used as efficient metal-free ORR electrocatalysts for the next generation of fuel cells, and should find other applications as well such as lithium-air batteries or some other energy storage devices.In the other work, we developed a piece of free standing graphene paper which could be used as an efficient flame retardant. The compound containing nitrogen and phosphorus atoms produced by hexachlorocyclotriphosphazene(HCCP) molecules has made a big contribution to the fire resistance. The as-prepared graphene oxide and hexachlorocyclotriphosphazene(GO-HCCP) paper shows a good flame retardant property in combustion. The tensile strength of GO-HCCP paper can reach up to 240 MPa, which is about 4.5 times higher than that of the individual GO paper with 53 MPa. Meanwhile, the GO-HCCP ink can be coated onto any basement to obtain the fire resistance as the flame retardant protective clothing. Furthermore, the synthesized reduced GO-HCCP flame retardant paper has a significant promotion on the flame-retardant behavior after thermal reduction than the GO-HCCP flame retardant paper. All the results indicate that these flame retardant graphene papers can be good candidates for flame retardancy and have potential applications in some areas such as civil, military, and aerospace flame retardant fields.