天然气制乙炔副产炭黑的改性及其在超级电容的应用研究OA

In conventional acetylene production from natural gas,by-product carbon black(moisture content>50%)is typically classified as process waste requiring costly third-party disposal due to negligible economic value.A multiscale synergistic modification strategy to transform this material into high-performance conductive carbon for supercapacitors through integrated mechanical grinding activation,KOH chemical activation,and Joule heat shock processing was propsed.This approach enables high-value utilization of industrial by-products while advancing domestic manufacturing of premium conductive carbons.In this study,planetary ball milling was first employed to mechanically activate the carbon black,reducing particle size and optimizing pore architecture to elevate the specific surface area from 43.24 m2/g to 94.83 m2/g.Subsequently,high-temperature chemical activation was conducted using a combination of KOH and Joule heat shock technology to construct hierarchical pore structures within the carbon black,enhancing its specific surface area and pore volume.The interlayer spacing of the graphite microcrystalline structure in the carbon black was adjusted using Joule heat shock technology to approach that of ideal graphite while maintaining a high porosity.After modification,the porous graphite carbon achieved a specific surface area of 989.39 m2/g,with mesopores accounting for 78.9%of the total pore volume.This value exceeds the specific surface area of Ketjen Black ECP300J(817 m2/g).The specific capacitance of the material reaches 305.66 F/g at a current density of 0.5 A/g,which is higher than that of carbon microspheres prepared by lignin carbonization(262.5 F/g).When assembled into a symmetric supercapacitor,the carbon black electrode retained a specific capacitance of 174.56 F/g after 1 000 cycles at a high current density of 5 A/g,with the cycling efficiency maintained at 93.91%.At a pressure of 8.2 MPa,the electrical conductivity of the carbon black can reach 1.12 S/mm,corresponding to a resistivity of 0.89 Ω·m,which is much lower than the national standard value of 3 000 Ω·mm for the resistivity of acetylene carbon black.The modified by-product carbon black exhibits exceptional electrical conductivity,rendering its suitable for applications in high-performance supercapacitors and other new energy fields.