Abstract

Honeycomb nitrogen-doped porous carbon (NPC) was prepared for supercapacitor applications by hydrothermal carbonization and KOH activation process. This process used glucose as the carbon source and trans-1, 2-cyclohexane diamine tetraacetic acid as the nitrogen source. It can both control the morphology and improve the electrical performances of the as-achieved NPC. The porous carbon electrode offers improved electrochemical properties with a capacitance as high as 423 F/g at 0.5 A/g. There was excellent cycling stability with 92.5% capacitance retention after 5000 cycles at 10 A/g current density as well as good rate performance with 300 F/g even at 20 A/g. This is due to the hierarchical porous structure, high specific surface area, numerous nitrogen groups, and good electrical conductivity. Moreover, the symmetric supercapacitor based on the porous carbon materials in neat DLC301 electrolyte delivers a high energy density of 58.75 Wh/kg and an excellent power density of 250 W/kg. Two assembled supercapacitors were connected and utilized for the driving recorder to work normally for 15 s. These satisfactory electrochemical properties indicate that the honeycomb 3D porous carbon has good prospects as an electrode for supercapacitors.

Graphic abstract

中文翻译：

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氮掺杂多孔碳基材料的超级电容性能

摘要

通过水热碳化和KOH活化工艺制备了蜂窝状掺氮多孔碳（NPC），用于超级电容器。该方法使用葡萄糖作为碳源，使用反式1，2-环己烷二胺四乙酸作为氮源。它既可以控制形态，又可以改善所获得的NPC的电性能。多孔碳电极提供了改进的电化学性能，在0.5 A / g时的电容高达423 F / g。在电流密度为10 A / g的情况下进行5000次循环后，具有出色的循环稳定性和92.5％的电容保持率，甚至在20 A / g的条件下也具有300 F / g的良好速率性能。这是由于分层的多孔结构，高的比表面积，大量的氮基和良好的导电性。此外，纯DLC301电解质中基于多孔碳材料的对称超级电容器可提供58.75 Wh / kg的高能量密度和250 W / kg的出色功率密度。连接了两个组装好的超级电容器，并用于行车记录仪正常工作15 s。这些令人满意的电化学性能表明，蜂窝状3D多孔碳具有作为超级电容器电极的良好前景。

图形摘要