Zhang Dong, Gao Hongquan, Hua Guomin, Zhou Haitao, Wu Jianchun, Zhu Bowei, Liu Chao, Yang Jianhong, Chen De
School of Materials Science and Engineering, Jiangsu University, Zhenjiang, China.
Department of Chemical Engineering, Norwegian University of Science and Technology, Trondheim, Norway.
Front Chem. 2020 Feb 18;8:6. doi: 10.3389/fchem.2020.00006. eCollection 2020.
Carbon-ionic liquid (C-IL) supercapacitors (SCs) promise to provide high capacitance and high operating voltage, and thus high specific energy. It is still highly demanding to enhance the capacitance in order to achieve high power and energy density. We synthesized a high-pore-volume and specific-surface-area activated carbon material with a slit mesoporous structure by two-step processes of carbonization and the activation from polypyrrole. The novel slit-pore-structured carbon materials provide a specific capacity of 310 F g at 0.5 A g for C-IL SCs, which is among one of the highest recorded specific capacitances. The slit mesoporous activated carbons have a maximum ion volume utilization of 74%, which effectively enhances ion storage, and a better interaction with ions in ionic liquid electrolyte, thus providing superior capacitance. We believe that this work provides a new strategy of engineering pore structure to enhance specific capacitance and rate performance of C-IL SCs.
碳离子液体（C-IL）超级电容器（SCs）有望提供高电容和高工作电压，从而具有高比能量。为了实现高功率和能量密度，提高电容仍然具有很高的要求。我们通过聚吡咯的碳化和活化两步法合成了一种具有狭缝介孔结构的高孔容和比表面积的活性炭材料。这种新型狭缝孔结构的碳材料在0.5 A g下为C-IL SCs提供了310 F g的比电容，这是有记录以来最高的比电容之一。狭缝介孔活性炭的最大离子体积利用率为74%，有效提高了离子存储能力，并与离子液体电解质中的离子有更好的相互作用，从而提供了优异的电容。我们相信这项工作为设计孔结构以提高C-IL SCs的比电容和倍率性能提供了一种新策略。
