Hierarchical porous lignin-based carbon aerogels, synthesized through a low-cost and simple method, are promising for applications in supercapacitor electrodes. Lignin-based carbon aerogels are prepared by pyrolysis and KOH activation of lignin-based aerogels. Lignin-based aerogels are prepared by mixing of enzymatic hydrolysis lignin (L), resorcinol (R) and formaldehyde (F) under the catalysis of Na₂CO₃ (C) followed by gelation, aging and ambient drying process. The results show that lignin-based carbon aerogels with a L/(L + R) ratio of 20%, exhibit a high specific surface area of 779 m²/g, a large total pore volume of 0.48 cm³/g, and a large micropore volume of 0.29 cm³/g. The obtained lignin-based carbon aerogels exhibit an interconnected, hierarchical porous network structure and a high degree of graphitization, which further contributes to their excellent electrochemical performance as electrodes in supercapacitors. The specific capacitance reaches 142.8 F/g at a current density of 0.5 A/g. Even at a large current density of 10 A/g, the specific capacitance of the CA-L20 electrode remains 112.5 F/g. After 2000 charge/discharge cycles, the specific capacitance still maintains 96% of its initial value, which indicates an excellent durability.

通过低成本和简单方法合成的多层多孔木质素基碳气凝胶有望用于超级电容器电极。木质素基碳气凝胶是通过木质素基气凝胶的热解和KOH活化而制备的。基于木质素的气凝胶是通过在Na ₂ CO ₃（C）的催化下将酶促水解木质素（L），间苯二酚（R）和甲醛（F）混合，然后进行胶凝，老化和室温干燥过程而制备的。结果表明，L /（L + R）比率为20％的木质素基碳气凝胶具有779 m ² / g的高比表面积，0.48 cm ³ / g的大总孔体积和0.29 cm ^3的大微孔体积/G。所获得的木质素基碳气凝胶具有互连的，分层的多孔网络结构和高度的石墨化程度，这进一步有助于它们作为超级电容器中的电极具有出色的电化学性能。在0.5 A / g的电流密度下，比电容达到142.8 F / g。即使在10 A / g的大电流密度下，CA-L20电极的比电容仍保持为112.5 F / g。经过2000次充电/放电循环后，比电容仍保持其初始值的96％，这表明它具有出色的耐久性。