Thermal Decomposition Characteristics And Thermal Dangerous Analysis Of Graphene-based Materials

Due to its excellent electrical and mechanical properties and high specific surface area,graphene is widely used in many fields such as supercapacitors,catalytic chemistry,lithium-ion batteries,etc.Transition metal oxides(TMOs)are highly stable.Their faraday capacitors are very large that occur on the surface and inside.Also,they have high theoretical specific capacity and they are cheap,environmentally friendly,and easy to obtain.So their research in the field of supercapacitors is very extensive and in-depth.The composite materials of graphene and TMOs have received extensive attention in the research of supercapacitors which exert their unique advantages.Doping nitrogen atoms into graphene significantly improves the electronic structure and chemical properties of graphene.The composite materials of nitrogen-doped graphene and TMOs are the research focus of supercapacitors.The application of supercapacitors requires composite materials with high thermal stability,especially in the military and aerospace fields.Therefore,studying the thermal decomposition kinetics of composite materials can not only analyze its thermal stability,but also provide a data basis for its future thermochemical applications at high temperatures.In this paper,Fe2O3/nitrogen-doped graphene(NG)and Mn3O4/nitrogen-doped graphene(NG)composite materials were prepared.Scanning electron microscope(SEM),X-ray diffraction(XRD)and X-ray photoelectron spectroscopy(XPS)were used to characterize the surface morphology and structure.The thermal decomposition behavior of the composites were investigated by TG analysis."Model-free" methods include Kissinger Akahira and Sunose(KAS)method and Flynn-Wall-Ozawa(FWO)method and Coats-Redfern model fitting method were employed to estimate.The main thermal decomposition process and the thermal decomposition characteristics and reaction mechanism of the composites were analyzed.Using the data measured by differential scanning calorimetry(DSC),TSADT,TTIT and Tb of the composites were estimated,which can preliminary estimate thermal stability and safety.Both have good thermal stability.