Preparation And Electrochemical Properties Of Flax Residue Activated Carbon Electrode Materials Codoped With Nitrogen And Iron

As a renewable resource,biomass has broad research and development prospects in replacing non renewable fuels and preparing carbon based materials.In recent years,using biomass waste as carbon source to prepare biomass carbon with excellent electrochemical performance is a research hotspot.The advantages of using carbon as electrode material are high stability and good electrochemical performance.In this paper,carbon materials doped with different elements were prepared with flax residue as material and KOH as activator.The feasibility of the different activation conditions and the influence of N,Fe elements on the electrochemical properties of flax residue-activated carbon as an electrode material was investigated.The specific contents are as follows:High-quality activated carbon was prepared with flax chips as a carbon source and KOH as an activator.Taking iodine adsorption and submethyl blue adsorption as the measure,the optimal preparation conditions of activated carbon were explored by immersion ratio,activation temperature and activation time,and the preparation conditions of optimal activated carbon(AC)were 1:2,activation temperature 800℃ and 100min.by orthogonal experimentsThe results showed that the iodine value of AC is 1667.1mg/g;methylene blue value of 429mg/g,higher than the national primary standard.SEM and BET analysis of AC showed that AC has a large specific surface area and rich pore structure.The electrode properties of AC were explored by comparison between AC and chips,with C of charcoal at a current density of 0.5A/g,Cm at 17.8F/g,increase to 10A/g,Cm 5F/g.The mass specific capacitor of the AC(Cm)C at 146F/g;increased to 10A/g,Cm For 105F/g.Experimental results show that AC showed good electrode performance compared to linecastic carbon.AC was used as the carbon source,and with urea(CH4N2O)was a dopant,and a N-doped activated carbon(ACN)electrode material was obtained by high-temperature calcination.The effect of different conditions on the electrochemical properties of activated carbon was investigated by varying the doping ratio of the dopant to AC,activation temperature and activation time.Experimental results showed that the optimal preparation condition for N doped active carbon(ACN)was 1:0.5(AC:CH4N2O quality ratio),700℃,and 100min.Active carbon prepared after optimal activation conditions exhibits excellent electrochemical properties as supercapacitor electrode materials.At the current density is 0.1 A/g,the mass-specific capacitance(Cm)At a 340.3F/g;current density of 1OA/g,Cm At 225 F/g,is 67%of the current density at 0.1 A/g,showing good doubling performance.The results show that moderate introduction of N elements significantly improves the electrochemical properties of the material.AC was used as the carbon source,and with Fe(NO3)3·9H2O is a dopant to obtain active carbon(ACFe)loading Fe elements by high-temperature calcination,by changing Fe(NO3)3·9H2.The mass concentration of O solution,activation temperature and activation time,study the effect of different conditions on the electrochemical properties of activated carbon,and study its electrochemical properties.The experimental results showed that the optimal condition for preparing the active carbon loaded with Fe elements was 0.5wt(1g of active carbon immersed in 100m L 0.5wt solution)(Fe(NO3)3·9H2O),700℃ and 120min.At a current density of 0.1 A/g,Cm Reaching 230.3F/g;when the current density increases to 10A/g,Cm At 120F/g,was 52%at 0.1A/g.The results show that the introduction of appropriate transition metal elements improves the active carbon electrochemical properties.AC was used as the carbon source,and with Fe(NO3)3·9H2O and urea are dopants,and N,Fe codoped active carbon(AC-N/Fe)was obtained by varying the doping amount of urea at high temperature calcination and exploring its electrochemical properties.Experimental results show that the preparation of doped Fe(NO3)3·9H2.The optimal condition for active carbon for O and urea was 0.5wt(1g of active carbon impregnated with 100mL Fe(NO)3)3·9H2,In O solution),1:0.5(AC:CH4N2O quality ratio),700℃,and 100min.When the current density is 0.1A/g and the Cm reaches 364F/g,increasing to 10A/g,Cm 231F/g,is 63.5%at 0.1A/g,demonstrating that AC-N/Fe has good fold performance.The results show that the Fe and N codoping means exhibit superior electrochemical properties than doping alone.