3D Carbon Frameworks for Ultrafast Charge/Discharge Rate Supercapacitors with High Energy-Power Density.
Carbon-based electric double layer capacitors (EDLCs) hold tremendous potentials due to their high-power performance and excellent cycle stability. However, the practical use of EDLCs is limited by the low energy density in aqueous electrolyte and sluggish diffusion kinetics in organic or/and ionic liquids electrolyte. Herein, 3D carbon frameworks (3DCFs) constructed by interconnected nanocages (10-20 nm) with an ultrathin wall of ca. 2 nm have been fabricated, which possess high specific surface area, hierarchical porosity and good conductive network. After deoxidization, the deoxidized 3DCF (3DCF-DO) exhibits a record low IR drop of 0.064 V at 100 A g-1 and ultrafast charge/discharge rate up to 10 V s-1. The related device can be charged up to 77.4% of its maximum capacitance in 0.65 s at 100 A g-1 in 6 M KOH. It has been found that the 3DCF-DO has a great affinity to EMIMBF4, resulting in a high specific capacitance of 174 F g-1 at 1 A g-1, and a high energy density of 34 Wh kg-1 at an ultrahigh power density of 150 kW kg-1 at 4 V after a fast charge in 1.11 s. This work provides a facile fabrication of novel 3D carbon frameworks for supercapacitors with ultrafast charge/discharge rate and high energy-power density.
['Leng|Changyu|C|', 'Zhao|Zongbin|Z|', 'Song|Yinzhou|Y|', 'Sun|Lulu|L|', 'Fan|Zhuangjun|Z|', 'Yang|Yongzhen|Y|', 'Liu|Xuguang|X|', 'Wang|Xuzhen|X|', 'Qiu|Jieshan|J|']
3D carbon frameworks Ultrafast charge/discharge rate Supercapacitors High energy-power density Nanocages