| Holey graphene refers to the introduction of nano-scale holes in two-dimensional graphene to obtain graphene materials with holes.Compared with the traditional graphene,the introduction of unique holes in the graphene increases the specific surface area,generates more defects,and generates more active sites,so that the active material has a diffusion path between layers and expands.Holey graphene has the application in electrocatalysis and electrochemical energy storage,especially the pores at the atomic level can play the role of screening ions and molecules of different sizes,and has application prospects in gas separation.The introduction of holes effectively was opened the energy band gap of graphene and changed the inert chemical properties of graphene,which greatly promoted the promotion of graphene in the field of electronic devices.N-doped perforated graphene can increase the active sites on the surface,enhance the conductivity of graphene,and improve its capacity characteristics,rapid charge and discharge capabilities and cycle life.This paper studies the relationship between the etching conditions and the structure of the hole-punched graphene,using different nitrogen sources to dope the hole-punched graphene,and studies the effect of the hole structure and nitrogen source on the nitrogen-doped hole-punched graphene.The innovation is to change the density and structure of the etchant adjustment hole to change the level of nitrogen doping,as well as the structure of nitrogen,and also to change the nitrogen source to adjust the doping form.We conducted an electrochemical performance test and found that porous graphene is used as the electrode material of supercapacitors and lithium ion batteries,can shows excellent performance.The specific research content is as follows:（1）Preparation of perforated graphene.In the experiment,graphene oxide was used as a raw material,and different metal salts were added to it.After freeze-drying,it was heated to 800°C.It was found that the metal ions were reduced during the heating process,and the graphene was etched at the same time.At the same time,we found that different metal salts and different etching conditions can affect the structure of the graphene.（2）Preparation of nitrogen-doped perforated graphene is used in supercapacitors.The pore structure and nitrogen-doped perforated graphene can affect the performance of supercapacitors.Among them,perforated graphene prepared with nickel nitrate It has excellent supercapacitor performance.In the 1 M KOH water washing electrolyte three-electrode test,when the current density is 0.5 A/g,the specific capacitance is 575F/g,and the energy density is 51.2 Wh/kg.（3）Tin dioxide has a high capacity as a lithium-ion battery material,but has poor stability.We compounded the nitrogen-doped perforated graphene to solve this problem.We designed and synthesized a high specific capacity nitrogen-doped perforated graphene nanosheet/Sn O2 composite material,which showed high specific capacities of 950.5 and 715 m Ah at current densities of 200 and 1000 m Ah/g,and after 200 cycles has excellent rate capability. |
