Preparation of lignin-based nitrogen-sulfur co-doped activated carbon by one-pot method and study of its supercapacitor and CO2 adsorption performance
With the increasing depletion of non-renewable resources such as coal,bio-based alternative materials have gained widespread attention.Lignin has a wide range of sources and huge reserves,but only about 5％of it has been resourcefully utilized globally.Therefore,in this study,a series of porous lignin-based nitrogen-sulfur doped activated carbon was prepared by a one-step method with sodium lignosulfonate as the raw material,FeCl3 as the activator,and urea as the nitrogen source,and explored the potential for supercapacitor and CO2 adsorption applications.It was found that in the three-electrode system with 6 mol/L KOH as the electrolyte,AC-1-NS has a high specific capacitance of up to 275 F/g at a current density of 0.5 A/g.The abundant pore structure and heteroatoms in AC determine its excellent electrochemical performance,and the nitrogen-doped introduction of N-5,N-6,and N-Q,and the sulfur-doped introduction of-SOx-lead to the gap in specific capac-itance of different ACs the specific surface area of AC-2-NS was as high as 1 510 m2/g,the microporosity was 75.8％,and the CO2 adsorption reached 2.86 mmol/g.The pore structure and heteroatom doping together de-termine its properties.
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