超级电容器
杂原子
电解质
化学工程
材料科学
热解
水溶液
功率密度
碳纤维
木质素
电容
电极
化学
有机化学
复合材料
工程类
物理化学
功率(物理)
物理
复合数
戒指(化学)
量子力学
作者
Fangyan Liu,Zixing Wang,Haitao Zhang,Long Jin,Xiang Chu,Bingni Gu,Haichao Huang,Weiqing Yang
出处
期刊:Carbon
[Elsevier]
日期:2019-04-11
卷期号:149: 105-116
被引量:285
标识
DOI:10.1016/j.carbon.2019.04.023
摘要
Abstract The O-N-S co-doped hierarchical porous carbons are prepared by direct pyrolysis of kraft lignin which is the byproduct from papermaking black liquor. The proposed preparation method is extremely facile, green-environmental, and low-cost without any additional activating agents, additives or templates. The kraft lignin-derived carbon materials possess large specific surface areas (338−1307 m2 g−1), hierarchical porous structures and abundant multi-heteroatoms co-doping (9.84–19.91 wt%). Benefiting from above synergistic advantages, the as-fabricated symmetric supercapacitor in aqueous electrolyte delivers a high specific capacitance of 244.5 F g−1 at 0.2 A g−1, excellent rate-capability (81.8% retention of initial capacitance at 40.0 A g−1), and outstanding cycling stability (91.6% retention over 10000 cycles). Importantly, this device in aqueous electrolyte delivers an energy density of 8.5 W h kg−1 at a power density of 100 W kg−1. Furthermore, a remarkable energy density of 66.8 W h kg−1 at a power density of 1.75 kW kg−1 has been achieved and 32.2 W h kg−1 is still maintained even at an ultrahigh power density of 40.0 kW kg−1 when ionic liquid serves as electrolyte. This study demonstrates the successful conversion of low-valued natural biomass derivative into sustainable high-performance supercapacitor electrode materials with a simple, low-cost, and green-environmental production process.
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