一锅法木质素基氮硫共掺杂活性炭的制备及其超级电容器和CO_(2)吸附性能研究

Preparation of lignin-based nitrogen-sulfur co-doped activated carbon byone-pot method and study of its supercapacitor andCO_(2)adsorption performance

随着煤炭等不可再生资源的日益枯竭,生物基替代材料得到了广泛关注,木质素来源广泛,储量巨大,但全球仅有约5%得到了资源化利用。因此本研究采用一步法,以木质素磺酸钠为原料,FeCl_(3)作为活化剂,尿素为氮源,制备了一种分级多孔木质素基氮硫共掺杂活性炭,探究其在超级电容器和CO_(2)吸附领域的应用潜力,为木质素的资源化利用提供理论支持。研究发现在6 mol/L KOH为电解液的三电极体系中,AC-1-NS在0.5 A/g的电流密度下具有高达275 F/g的比电容,AC中丰富的孔结构和杂原子决定其优异的电化学性能,掺氮引入的N-5、N-6、N-Q,掺硫引入的-SO x-导致不同AC的比电容产生差距。AC-2-NS的比表面积达到1510 m^(2)/g、微孔率为75.8%,CO_(2)吸附量达到2.86 mmol/g,孔结构和杂原子掺杂共同决定其性能。

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,FeCl_(3)as the activator,and urea as the nitrogen source,and explored the potential for supercapacitor and CO_(2)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-SO x-lead to the gap in specific capacitance of different ACs the specific surface area of AC-2-NS was as high as 1510 m 2/g,the microporosity was 75.8%,and the CO_(2)adsorption reached 2.86 mmol/g.The pore structure and heteroatom doping together determine its properties.