Abstract In this work, we present an effective route to develop composite electrodes consisting of highly porous nitrogen-doped carbon nanowires (PNCW) and manganese dioxide (MnO2), toward supercapacitor applications. The PNCW with hierarchically porous structure, prepared from polypyrrole nanowires, is used as a supporting substrate to deposit MnO2 based on a redox reaction between carbon and KMnO4. The morphology of the deposited MnO2 can be tuned by simply changing solution pH. The as-prepared PNCW/MnO2 composites possess a porous macrostructure, which is beneficial for the transport and diffusion of ions and electrons. An aqueous asymmetric supercapacitor device has been assembled using PNCW and PNCW/MnO2 as electrodes, which presents a satisfied energy density of 23.7 Wh kg−1 at 2000 W kg−1. The experimental data prove the feasibility of using PNCW as a porous carbon substrate for the preparation of composite electrodes in the asymmetric supercapacitor.

中文翻译：

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在用于非对称超级电容器的高度多孔氮掺杂碳纳米线上直接生长 MnO2

摘要 在这项工作中，我们提出了一种有效的途径来开发由高度多孔的氮掺杂碳纳米线 (PNCW) 和二氧化锰 (MnO2) 组成的复合电极，用于超级电容器应用。由聚吡咯纳米线制备的具有分级多孔结构的 PNCW 用作支撑基底，基于碳和 KMnO4 之间的氧化还原反应沉积 MnO2。可以通过简单地改变溶液 pH 值来调整沉积的 MnO2 的形态。所制备的 PNCW/MnO2 复合材料具有多孔宏观结构，有利于离子和电子的传输和扩散。使用 PNCW 和 PNCW/MnO2 作为电极组装了水性非对称超级电容器装置，在 2000 W kg-1 时表现出令人满意的 23.7 Wh kg-1 能量密度。