超级电容器
电解质
碳化
电容
杂原子
介孔材料
电极
电流密度
材料科学
化学工程
化学
比表面积
分析化学(期刊)
扫描电子显微镜
有机化学
物理化学
复合材料
催化作用
戒指(化学)
工程类
物理
量子力学
作者
Yingbin Liu,Guangxu Huang,Yuanyuan Li,Youheng Yao,Fengmei Zhang,Baolin Xing,Chuanxiang Zhang
出处
期刊:Energy & Fuels
[American Chemical Society]
日期:2020-03-02
卷期号:34 (3): 3909-3922
被引量:33
标识
DOI:10.1021/acs.energyfuels.9b04378
摘要
We propose a simple and low-cost synthesis of N–O–S co-doped hierarchical porous carbons (MGC-x) by direct carbonization of calcium lignosulfonate. MGC-x possesses a large surface area (∼1500 m2 g–1) and high mesopore ratio (>40%) and heteroatom content. In the three-electrode system, MGC-700 and MGC-800 exhibit high specific capacitances of 417 and 312 F g–1 at 0.5 A g–1 and 184 and 170 F g–1 even at 100 A g–1 using a 1 M H2SO4 electrolyte. Notably, there exists a critical current density when evaluating the rate capability of MGC-x electrodes, which is closely correlated to their ion diffusion and electron transport properties. In two-electrode configuration with a 3 M KOH electrolyte, MGC-700 with ultrahigh mass loading (∼13 mg cm–2, ∼210 μm) can deliver large specific capacitance of 249 F g–1 and excellent rate capability with capacitance retention of 81.9% from 0.05 to 20 A g–1. MGC-700 and MGC-800 both show superb cycling stabilities with 94 and 98% of original capacitances being retained after 10 000 cycles, respectively. Furthermore, the MGC-700-based supercapacitor with commercial-level electrode mass loading yields an impressive energy density of 7.2 Wh kg–1 at 62.5 W kg–1 and maintains 5.1 Wh kg–1 even at 4585.4 W kg–1. The MGC-800-based supercapacitor exhibits considerable energy densities of 26.7 and 9.8 Wh kg–1 at 309.8 and 7000 W kg–1 in a 1 M (C2H5)4NBF4/PC electrolyte, respectively, guaranteeing its utilization in high-performance supercapacitors.
科研通智能强力驱动
Strongly Powered by AbleSci AI