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⁻¹ at 1.0 A g⁻¹. Moreover, the assembled button‐type cell with two FNPC film electrodes shows a high energy density of 16.4 Wh kg⁻¹, a high power density of 67.4 kW kg⁻¹, and long‐term cyclic stability of 92% of the initial capacitance after 10 000 cycles at 10 A g⁻¹. 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.

中文翻译：

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像鱼网一样的氮掺杂碳膜直接锚固在碳布上，用作高性能超级电容器的无粘合剂电极。

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。为了使用简单有效的方法开发高性能碳电极，需通过煅烧预先涂在碳布上的KOH活化的聚吲哚来制备鱼网状，N掺杂的多孔碳（FNPC）膜。FNPC薄膜牢固地固定在碳布上，没有任何粘合剂。N含量为3.8 at％的FNPC膜在1.0 A g ^-1下表现出相当高的416 F g ^-1的比电容。此外，具有两个FNPC薄膜电极的组装式纽扣型电池的高能量密度为16.4 Wh kg ^-1，高功率密度为67.4 kW kg ^-1在10 A g ^-1下进行1万次循环后，其初始电容的长期循环稳定性为92％。高性能主要来自于伪电容和双层电容行为，润湿性，鱼网状纳米结构以及低界面电阻率的集成。该策略为高性能超级电容器提供了一种无粘合剂的柔性碳材料电极的实用，简单且低成本的设计。