Wu Jing, Xu Liming, Zhou Weiqiang, Jiang Fengxing, Liu Peipei, Zhang Hui, Jiang Qinglin, Xu Jingkun
Jiangxi Engineering Laboratory of Waterborne Coatings Jiangxi Science and Technology Normal University Nanchang 330013 China.
College of Chemistry and Molecular Engineering Qingdao University of Science & Technology Qingdao 266042 China.
Glob Chall. 2020 Jan 8;4(3):1900086. doi: 10.1002/gch2.201900086. eCollection 2020 Mar.
The low specific capacitance and energy density of carbon electrode has extremely limited the wide application of supercapacitors. For developing a high-performance carbon electrode using a simple and effective method, a fishnet-like, N-doped porous carbon (FNPC) film is prepared by calcining the KOH-activated polyindole precoated on carbon cloths. The FNPC film is tightly anchored on carbon cloths without any binder. The FNPC film with 3.8 at% N content exhibits a fairly high specific capacitance of 416 F g at 1.0 A g. Moreover, the assembled button-type cell with two FNPC film electrodes shows a high energy density of 16.4 Wh kg, a high power density of 67.4 kW kg, and long-term cyclic stability of 92% of the initial capacitance after 10 000 cycles at 10 A g. The high performances mainly came from the integration of pseudocapacitance and electrical double-layer capacitance behavior, wettability, fishnet-like nanostructure, as well as the low interfacial resistivity. This strategy provides a practical, uncomplicated, and low-cost design of binder-free flexible carbon materials electrode for high-performance supercapacitors.
碳电极的低比电容和能量密度极大地限制了超级电容器的广泛应用。为了用一种简单有效的方法开发高性能碳电极，通过煅烧涂覆在碳布上的KOH活化聚吲哚制备了一种鱼网状的氮掺杂多孔碳（FNPC）薄膜。FNPC薄膜紧密地固定在碳布上，无需任何粘合剂。氮含量为3.8 at%的FNPC薄膜在1.0 A g时表现出相当高的比电容，为416 F g。此外，由两个FNPC薄膜电极组装的纽扣型电池显示出16.4 Wh kg的高能量密度、67.4 kW kg的高功率密度以及在10 A g下10000次循环后初始电容的92%的长期循环稳定性。这些高性能主要源于赝电容和双电层电容行为的整合、润湿性、鱼网状纳米结构以及低界面电阻。该策略为高性能超级电容器提供了一种实用、简单且低成本的无粘合剂柔性碳材料电极设计。
