超级电容器
多孔性
材料科学
氮气
功率密度
化学工程
比表面积
兴奋剂
碳纤维
能量密度
电容
功率(物理)
储能
活性炭
生物量(生态学)
热解
比能量
电化学
微型多孔材料
吸附
电流密度
环境科学
复合材料
化学
地质学
工程物理
光电子学
电极
催化作用
工程类
有机化学
热力学
物理化学
物理
海洋学
作者
Junting Sun,Jin Niu,Mengyue Liu,Jing Ji,Meiling Dou,Feng Wang
标识
DOI:10.1016/j.apsusc.2017.07.220
摘要
Porous carbon materials with hierarchical structures attract intense interest for the development of high-performance supercapacitors. Herein, we demonstrate a facile and efficient strategy to synthesize nitrogen-doped hierarchically porous carbons with tailored porous structure combined with high specific surface area (SSA), which involves a pre-carbonization and a subsequent carbonization combined with KOH activation of silkworm cocoon precursors. Through adjusting the mass ratio of the activator (KOH) to pre-carbonized precursor in the activation process, the hierarchically porous carbon prepared at the mass ratio of 2 (referred to as NHPC-2) possesses a high defect density and a high SSA of 3386 m2 g−1 as well as the relatively high volumetric proportion of mesopores and macropores (45.5%). As a result, the energy density and power density of the symmetric supercapacitor based on NHPC-2 electrode are as high as 34.41 Wh kg−1 and 31.25 kW kg−1 in organic-solvent electrolyte, and are further improved to 112.1 Wh kg−1 and 23.91 kW kg−1 in ionic-liquid electrolyte.
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