Preparation And Electrochemical Properties Of Biomass-Based Porous Carbon

Biomass materials have become a research hotspot of carbon materials due to their environmental friendliness,sustainability,and ease of preparation.The porous carbon material prepared by the biomass has the advantages of large specific surface area and rich pore structure,and its good stability is unmatched by other materials.Therefore,the biomass-based carbon material is widely used in the field of electrochemistry.In this paper,porous carbon materials is prepared from biomass,which is constructed a symmetric supercapacitor as an electrode material.Further,composite materials were prepared by combining them with conductive polymers to increase the specific capacitance of materials,and symmetric capacitors were constructed to increase the energy density.In order to further increase the energy density of the device,the carbon material and the metal material are combined to form a supercapacitor,and the potential window is enlarged while increasing the specific capacitance of the device,thereby greatly increasing the capability density.The main contents are as follows:1.A 3D honeycomb morphology porous carbon material?PRPC-1K?was prepared by using poplar root as a raw material and using conventional KOH as an activator.The effects of different proportions of activators on the morphology,structure and properties of porous carbon were investigated.The PRPC-1K was used as the supercapacitor electrode material,and the three-electrode test was carried out in a 2 M KOH electrolyte solution.When the current density was 0.5 A g^-1,a relatively high specific capacitance was obtained(170.0 F g^-1).Further construction of a symmetric supercapacitor using PRPC-1K as an electrode material broadens the potential window to 1.8 V in a 1 M Na₂SO₄ electrolyte and obtains a relatively high energy density(13.8 Wh kg^-1).2.Porous carbon material?PRPC-1K?was prepared by using poplar root root as raw material,and a composite material of biomass carbon material and polypyrrole?PRPC-1K/PPy?was prepared by simple interfacial polymerization method.The three-electrode test was performed in the 2 M KOH electrolyte solution,and the composite material had a higher specific capacitance(250.0 F g^-1,current density of 0.5A g^-1)than the biomass carbon material?PRPC-1K?.After 10,000 cycles,the stability is still 80%.We further constructing a symmetric supercapacitor using PRPC-1K/PPy as an electrode material.3.In order to further improve the energy density of biomass carbon-based supercapacitors,a novel flower-like nanosheet?Ni₃N?metal nitride material with high specific capacitance was prepared by one-step hydrothermal method.We designed to use PRPC-1K as a negative electrode material and Ni₃N as a positive electrode material to construct a supercapacitor?Ni₃N//PRPC-1K?,which is obtained by combining a porous carbon material with excellent stability and a metal material with high specific capacitance.The Ni₃N//PRPC-1K ASC obtain a high energy density(30.9 Wh kg^-1)and good cycle performance?81%after 5000 cycles?...