Porous Structure Modulation And Electrochemical Performance Study Of Stainless Steel Mesh

As a kind of super capacitor energy storage devices between conventional capacitors and batteries,has a large power density,rapid charging and discharging,long cycle life,and the advantages of security,has been widely studied in recent years,due to the low price of transition metal oxide,given a great many preparation methods and theory is becoming a hot spot of research materials.As one of the factors affecting the electrochemical properties of supercapacitors,the conductivity of electrode materials is of great significance for improving the specific capacity of electrodes and the electrochemical properties such as energy density and power density of supercapacitors.In this paper,the stainless steel mesh was anodized under different reaction conditions to explore the influence of various factors on the formation of porous structure.The influence of element doping on the electrochemical properties and structure of stainless steel mesh was discussed.The porous structure was characterized by FESEM and HRTEM.The composition of porous structure was analyzed by XRD,EDS and XPS.By changing the reaction conditions of anodic oxidation of stainless steel mesh,the relationship between the reaction voltage,reaction time,reaction temperature,electrolyte and the morphology and properties of porous structure were observed and analyzed,and then the formation mechanism of porous structure was discussed.The research results are as follows:?1?To explore the influence of different factors on the porous structure of stainless steel mesh:with the increase of oxidation voltage,when the voltage is too high due to the effect of polarization,the stainless steel mesh is more resistant to corrosion,the best voltage for the preparation of stainless steel mesh porous structure with better morphology is about9 V;After anodizing for 300 s,the surface of the porous structure will be almost completely covered by the Fe₂O₃/NiO layer formed,which will prevent the continuous oxidation of the stainless steel mesh.The lower electrolyte temperature is favorable to form regular and ordered porous structure.Compared with 316L stainless steel,304stainless steel has a higher capacitance due to the higher content of Cr.In the concentrated nitric acid electrolyte,the formation of a shallow small pit structure,due to the passivation of concentrated nitric acid,is not conducive to the electrolyte on the stainless steel mesh for deep anodic oxidation.?2?The porous structure of 304 stainless steel mesh was characterized by FESEM,HRTEM and XRD under appropriate conditions.The test showed that it was a mesoporous Fe₂O₃/NiO composite structure.The nitrogen adsorption-desorption test showed that the BET surface specific area could reach 48.6 m² g^-1.A stainless steel mesh porous structure was used as the negative electrode,and the electrochemical properties of the prepared samples were tested and analyzed with a three-electrode system.The maximum specific capacitance per unit area was 1.22 F cm^-2,and the capacitance retention rate reached over 90%after 10,000 cycles of charging and discharging.Under the condition of 500^?C high temperature,porous structure of stainless steel wire mesh?ASSM?for NH3 NASSM doping nitrogen source.Through the characterization of XPS,XRD and EDS,it was found that the doping of N elements resulted in the formation of Fe₃N/NiN and other metal nitrides,which increased the overall specific capacity by 23%,indicating that the element doping had an enhancement effect on the electrochemical properties of the porous structure of stainless steel mesh.