萘基相互连接的多孔碳纳米囊的制备及超电容性能

以萘为碳源, 采用MgO模板诱导耦合KOH裁剪技术制备了相互连接的多孔碳纳米囊(ICNC). 结果表明所制备的ICNC₂具有大的比表面积(1811 m²/g)、 高的压实密度(1.38 g/cm³)和微孔孔容含量(58.93%). 在对称的超级电容器(SC)中, ICNC₂电极的体积比容在不同电流密度下分别高达420.8 F/cm³(0.069 A/cm³)和315 F/cm³(27.6 A/cm³), 容量保持率为74.82%. 在38 W/L功率密度下, ICNC₂基SC的体积能量密度为14.6 W?h/L. 经过20000次循环后, 其体积比容仅衰减1.4%, 库伦效率为99.1%, 为从萘基小分子制备储能用功能碳材料提供了一种可行的方法.

Preparation and Supercapacitive Performance of Naphthalene-based Interconnected Porous Carbon Nanocapsules

Porous carbon materials volume densities are usually less than 0.5 g/cm³， resulting in that porous carbon materials have a low volume specific capacitance. Therefore， it is still a big challenge to improve volume specific capacitance performance of carbon materials. Herein， interconnected porous carbon nanocapsules（ICNC） were prepared by MgO template induction coupled with KOH tailoring technology using naphthalene as carbon source. The as-prepared ICNC₂ has a large specific surface area（1811 m²/g）， high compaction density（1.38 g/cm³） and micropore volume content（58.93%）. In a symmetrical supercapacitor， the ICNC₂ electrode displays a high volumetric capacitance of 420.8 F/cm³ at 0.069 A/cm³ and retains 315.1 F/cm³ at 27.6 A/cm³ with capacitance retention of 74.82%. The supercapacitor device of ICNC₂ electrode displays a high volumetric energy density of 14.6 W·h/L at the power density of 38 W/L. It also shows excellent cycle stability with only 1.4% decay and outstanding coulombic efficiency of 99.1% after 20000 cycles. This work provides a feasible method for production of high-performance carbon nanocapsules from small aromatic molecules for energy storage.