Shaanxi University of Chinese Medicine, Shaanxi Collaborative Innovation Center of Chinese Medicine Resources Industrialization, State Key Laboratory of Research & Development of Characteristic Qin Medicine Resources (Cultivation), Shaanxi Innovative Drug Research Center, Xianyang 712083, PR China.
Waste Manag. 2020 Apr 1;106:250-260. doi: 10.1016/j.wasman.2020.03.032. Epub 2020 Mar 30.
Here in this work, porous carbon is prepared from waste of a traditional Chinese medicine Salvia miltiorrhiza flowers. Structures of the porous carbons are regulated by simply regulating of activation temperatures and dosages of activator. The optimized porous carbon owns a high specific surface area of 1715.3 m g and total pore volume of 0.6392 cm g, together with a unique hierarchical architecture and ultrahigh content of 45.97 at% self-doped O and 0.49 at% of N. When used as electrode materials for supercapacitors, the prepared porous carbon exhibited excellent specific capacitance and energy density as well as fantastic cycle stability. Under a current density of 0.5 A/g, the electrode based on this material showed high specific capacitance of 530 F/g, with fantastic rate performance of 258 F/g at 20 A/g and excellent cycle stability of 91% capacitance retention for 10,000 cycles at 10 A/g in a three-electrode system in 6 M KOH. In assembled supercapacitors, the SF-PC based electrode worked under potential of 1 V and exhibited 222 F/g of specific capacitance at a current density of 0.5 A/g, and even when the current density was increased up to 30 A/g, the specific capacitance can still as high as 168 F/g, verified the excellent performance of SF-PC. Symmetric supercapacitors in NaSO and TEABF/AN electrolyte showed voltage ranges of 1.8 V and 3 V respectively, and high energy density of 22.2 Wh Kg at 448. W Kg and 40.6 Wh Kg at 755.8 W Kg are obtained.
在这里的工作中，多孔碳是由丹参花这种传统中药的废料制备的。通过简单调节活化温度和活化剂用量来调节多孔碳的结构。优化后的多孔碳具有高达 1715.3 m ²/g 的比表面积和 0.6392 cm ³/g 的总孔体积，以及独特的分级结构和超高的 45.97 at%自掺杂 O 和 0.49 at%N。当用作超级电容器的电极材料时，所制备的多孔碳表现出优异的比电容和能量密度以及极好的循环稳定性。在 0.5 A/g 的电流密度下，基于该材料的电极表现出 530 F/g 的高比电容，具有出色的倍率性能，在 20 A/g 时为 258 F/g，在三电极体系中在 6 M KOH 中 10000 次循环后电容保持率为 91%，循环稳定性极好。在组装的超级电容器中，SF-PC 基电极在 1 V 的电位下工作，在 0.5 A/g 的电流密度下表现出 222 F/g 的比电容，即使电流密度增加到 30 A/g，比电容仍高达 168 F/g，验证了 SF-PC 的优异性能。在 NaSO 和 TEABF/AN 电解质中对称超级电容器的电压范围分别为 1.8 V 和 3 V，在 448.8 W·kg 时获得了 22.2 Wh·kg 的高能量密度，在 755.8 W·kg 时获得了 40.6 Wh·kg 的高能量密度。
