阴极
材料科学
多孔性
超级电容器
电容器
化学工程
电解质
微型多孔材料
水溶液
储能
电容
纳米技术
复合材料
电极
化学
电气工程
有机化学
物理化学
电压
功率(物理)
工程类
物理
量子力学
作者
Qi Cao,Ning Gao,Fan Yang,Ye Wang,Bofeng Li,Xinlong Ma
出处
期刊:Nanoscale
[The Royal Society of Chemistry]
日期:2022-01-01
卷期号:14 (3): 691-699
被引量:6
摘要
Activated carbons with high specific surface area (SSA) and well-modulated pore structure are highly desirable for achieving high-performance capacitive energy storage. Herein, hierarchically porous activated carbons (PACs) are synthesized by a tableting-activation method. The quick release of high-pressure gaseous products from the inside of the tablets can be regarded as a dissipative process, which leads to the formation of well-ordered high density meso- or macropores in the resulting material. The porous structure of the PACs has been modulated by adjusting the dissipative process parameters, such as the tableting pressure and tablet thickness. As a result, the optimal PAC (PAC-10) possesses an ultrahigh SSA (up to 3211 m2 g-1) and a well-developed hierarchical porous structure, which leads to an excellent capacitive energy-storage performance both in an aqueous electrolyte supercapacitor system and a Li ion capacitor (LIC) system. In particular, as a cathode for LICs, PAC-10 exhibits an extremely high specific capacity of 251 mA h g-1 at 0.5 A g-1 and still retains 158 mA h g-1 at a high rate of 15 A g-1.
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