Zhang Xiaohua, Jiang Chao, Li Hengxiang, Gan Xinyu, Shi Wenjing, Liu Yanzhen, Yan Xiaoyan, Zhao Xinxin, Liu Baosheng
School of Materials Science and Engineering, Taiyuan University of Science and Technology, Taiyuan 030024, China.
School of Materials Science and Engineering, Taiyuan University of Science and Technology, Taiyuan 030024, China.
J Colloid Interface Sci. 2023 Dec;651:211-220. doi: 10.1016/j.jcis.2023.07.140. Epub 2023 Jul 24.
Herein, three-dimensional activated graphitic carbon spheres (AGCS) were constructed by simultaneous activation-graphitization of Fe-tannic acid coordination spheres with the assistance of KOH. Nanosheets-assembled AGCS with complex intersecting channel system can expose more active sites for charge storage. Simultaneous activation-graphitization can relieve trade-off relationship between porosity and conductivity of carbon materials. Benefiting from multiple synergistic effects of large specific surface area (2069 m g), abundant ion-accessible micropores (>0.78 nm), good electronic conductivity (I/I = 1.11), and moderate amount of oxygen doping, the optimized AGCS-2 has favored ion and electron transfer channels. AGCS-2 based zinc-ion hybrid capacitor (ZIHC) displays a high specific capacity of 148.6 mA h g (334 F g) at 0.5 A g, a remarkable energy density of 119.0 W h kg at 1440 W kg, and superior cycling life with 96% capacity retention after 10,000 cycles. This simultaneous activation-graphitization strategy may open up a new avenue to design novel carbon spheres linking optimal pores and graphitic carbon structure for ZIHC application.
在此，通过在KOH的辅助下对铁-单宁酸配位球进行同步活化-石墨化，构建了三维活性石墨碳球（AGCS）。具有复杂交叉通道系统的纳米片组装AGCS可以暴露出更多用于电荷存储的活性位点。同步活化-石墨化可以缓解碳材料孔隙率和电导率之间的权衡关系。受益于大比表面积（2069 m²/g）、丰富的可离子进入微孔（>0.78 nm）、良好的电子导电性（I/I₀ = 1.11）以及适量的氧掺杂等多种协同效应，优化后的AGCS-2具有良好的离子和电子传输通道。基于AGCS-2的锌离子混合电容器（ZIHC）在0.5 A/g时表现出148.6 mA h/g（334 F/g）的高比容量，在1440 W/kg时具有119.0 W h/kg的显著能量密度，并且具有优异的循环寿命，在10000次循环后容量保持率为96%。这种同步活化-石墨化策略可能为设计用于ZIHC应用的连接最佳孔隙和石墨碳结构的新型碳球开辟一条新途径。
