Zhang Zhili, Li Fengfeng, Chen Jiachuan, Yang Guihua, Ji Xingxiang, Tian Zhongjian, Wang Baobin, Zhang Lei, Lucia Lucian
State Key Laboratory of Biobased Material and Green Papermaking, Qilu University of Technology (Shandong Academy of Sciences), Jinan, China.
Department of Forest Biomaterials, North Carolina State University, Raleigh, NC, United States.
Front Bioeng Biotechnol. 2022 Sep 29;10:1030944. doi: 10.3389/fbioe.2022.1030944. eCollection 2022.
A template-free and one-step carbonization process was developed for fabricating graphitic porous carbon spheres (GPCSs) on hemicelluloses as the electrode material for supercapacitors. This method is green, low-energy, and less time consuming compared to the conventional two-step process (pore-forming and graphitizing). It uses KFeO, a mild activating agent that fulfills synchronous activation and graphitization. The GPCSs is regular spherical shape, have high nanoporosity, a large specific surface area (1,250 m2 g), and have a high graphitization degree. A unique structural advantage includes a rich interconnected conductive network for electron transfer that shortens the ion transport distance of the electrolyte. Remarkably, the GPCSs electrode displays outstanding electrochemical performance including high specific capacitance (262 F g at 1.0 A g), rate capability energy (80%, 20 A g), and excellent cycling stability (95%, 10,000 cycles). This work represents a powerful methodology to develop sustainable and low-cost energy storage devices from hemicellulose.
开发了一种无模板一步碳化工艺，用于在半纤维素上制备石墨化多孔碳球（GPCSs）作为超级电容器的电极材料。与传统的两步法（造孔和石墨化）相比，该方法绿色、低能耗且耗时少。它使用KFeO作为温和的活化剂，实现同步活化和石墨化。GPCSs呈规则球形，具有高纳米孔隙率、大比表面积（1250 m²/g）和高石墨化程度。独特的结构优势包括丰富的相互连接的导电网络用于电子转移，缩短了电解质的离子传输距离。值得注意的是，GPCSs电极表现出出色的电化学性能，包括高比电容（在1.0 A/g时为262 F/g）、倍率性能能量（80%，20 A/g）和优异的循环稳定性（95%，10000次循环）。这项工作代表了一种从半纤维素开发可持续和低成本储能装置的有力方法。
