Department of Chemistry, College of Science, Huazhong Agricultural University, Wuhan 430070, P. R. China.
College of Resources and Environment, Huazhong Agricultural University, Wuhan 430070, P. R. China.
J Am Chem Soc. 2021 Mar 10;143(9):3280-3283. doi: 10.1021/jacs.0c12098. Epub 2021 Mar 1.
Biomass-derived carbon materials prepared via pyrolysis from natural wood structures show potential for a storage application. Natural wood is composed of multiple carbon sources, including lignin, hemicellulose, and cellulose, which influence the formation and microstructure of pyrolysis carbon. However, the mechanism is not fully understood. In this work, vast lignin is selectively consumed via biodegradation with fungi from basswood. The results demonstrate that the as-prepared carbon material has a short-range ordered graphitic structure after thermal treatment. The improved graphitization degree of carbon suggests that cellulose is beneficial to graphite formation during pyrolysis. The elevated graphitization degree helps to improve the charge transfer and the thermodynamic stability of the electrode reaction. As a proof of concept, the obtained carbon current collector as a sodium-metal anode can undergo cycling at an areal capacity of 10 mAh cm for over 4500 h and yield an excellent Coulombic efficiency of >99.5%.
通过热解从天然木材结构中制备的生物量衍生碳材料显示出在储能应用方面的潜力。天然木材由多种碳源组成，包括木质素、半纤维素和纤维素，这些碳源影响着热解碳的形成和微观结构。然而，其机制尚未完全阐明。在这项工作中，通过真菌对椴木中的大量木质素进行生物降解，实现了选择性消耗。结果表明，经热处理后，所制备的碳材料具有短程有序石墨结构。碳的石墨化程度提高表明纤维素有利于热解过程中石墨的形成。较高的石墨化程度有助于提高电极反应的电荷转移和热力学稳定性。作为概念验证，所获得的碳集流体作为钠金属阳极可以在面容量为 10 mAh cm 的条件下循环超过 4500 小时，且库仑效率>99.5%。
