Zhou Junshuang, Lian Jie, Hou Li, Zhang Junchuan, Gou Huiyang, Xia Meirong, Zhao Yufeng, Strobel Timothy A, Tao Lu, Gao Faming
Key Laboratory of Applied Chemistry, College of Environmental and Chemical Engineering, Yanshan University, Qinhuangdao 066004, China.
Department of Mechanical, Aerospace, and Nuclear Engineering, Rensselaer Polytechnic Institute, Troy, New York 12180, USA.
Nat Commun. 2015 Sep 29;6:8503. doi: 10.1038/ncomms9503.
Highly porous nanostructures with large surface areas are typically employed for electrical double-layer capacitors to improve gravimetric energy storage capacity; however, high surface area carbon-based electrodes result in poor volumetric capacitance because of the low packing density of porous materials. Here, we demonstrate ultrahigh volumetric capacitance of 521 F cm(-3) in aqueous electrolytes for non-porous carbon microsphere electrodes co-doped with fluorine and nitrogen synthesized by low-temperature solvothermal route, rivaling expensive RuO2 or MnO2 pseudo-capacitors. The new electrodes also exhibit excellent cyclic stability without capacitance loss after 10,000 cycles in both acidic and basic electrolytes at a high charge current of 5 A g(-1). This work provides a new approach for designing high-performance electrodes with exceptional volumetric capacitance with high mass loadings and charge rates for long-lived electrochemical energy storage systems.
具有大表面积的高度多孔纳米结构通常用于双电层电容器，以提高重量储能容量；然而，由于多孔材料的堆积密度低，高表面积的碳基电极导致体积电容较差。在此，我们展示了通过低温溶剂热法合成的氟和氮共掺杂无孔碳微球电极在水性电解质中的超高体积电容为521 F cm(-3)，可与昂贵的RuO2或MnO2赝电容器相媲美。新电极在5 A g(-1)的高充电电流下，在酸性和碱性电解质中经过10,000次循环后，还表现出优异的循环稳定性，且无电容损失。这项工作为设计具有出色体积电容、高负载量和高充电速率的高性能电极提供了一种新方法，用于长寿命电化学储能系统。
