凯发

It is important for controlling surface and interfaces to reachhigh-performance multi-functional or catalytic materials. Firstly, I willpresent that we can prepare big sheets size of graphene flakes, small graphenemicrosheets and isolated metal-atomsanchored graphene via managing the interfaces of graphite interlayer. We foundconductive solid-electrolyte interphase (SEI) is useful to prepare graphene efficiently throughelectrochemical exfoliation of graphite or microcrystalline graphite minerals andeven graphene-based catalytic materials. I will show that iron-based SEI layer onto graphene surface can be formed through the redox decomposition of iron-carbonspecies during theelectrochemical process. High-performance Fe-N-C/graphene electrocatalysts for oxygen or carbondioxide reduction reaction were obtained by tuning SEI composition with surfacemodification. Next, I will present that we have fabricated graphene integrating carbon fiber and hierarchical porous carbon as a robust flexible “carbon-concrete” multi-functional film through carbon-fiber bundle spreading andhybridizing with graphene flakes.  Also, graphene can assist conversing pitch to sheet-like microporous carbon/graphene composites with a high specific surfacearea of 2930 m²/g and a high carbon yield of 72%. The porous carbon cathode impregnatedwith 71.2% of elemental sulphur achieved high coulombic efficiency of 99.0%over 1500 cycles for a Li-S battery. After that, I will show that graphene microsheets reinforced polyurethane exhibits overall improvement of multi-functional performances including mechanical properties of tensile strength, modulusandshape memory, thermal and electrical conductivity, thermal stability and flame retardance. Finally, I will talk about the identificationof active iron site in Fe/ZSM-35 investigated by in situ resonance Ramanspectroscopy combined with Mössbauer spectroscopy.