Waste Management ( IF 8.1 ) Pub Date : 2020-03-30 , DOI: 10.1016/j.wasman.2020.03.032 YanLei Zhang , ZhiShu Tang
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 m2 g−1 and total pore volume of 0.6392 cm3 g−1, 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-PC700-3 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-PC700-3. Symmetric supercapacitors in Na2SO4 and TEABF4/AN electrolyte showed voltage ranges of 1.8 V and 3 V respectively, and high energy density of 22.2 Wh Kg−1 at 448. W Kg−1 and 40.6 Wh Kg−1 at 755.8 W Kg−1 are obtained.
中文翻译:
源自草本植物废料的多孔碳,用于超级电容器电极,具有超高的比电容和出色的能量密度
在这项工作中,多孔碳是由中药丹参花的废料制得的。通过简单地调节活化温度和活化剂的剂量来调节多孔碳的结构。优化的多孔碳具有1715.3 m 2 g -1的高比表面积和0.6392 cm 3 g -1的总孔体积以及独特的层次结构和45.97 at%的自掺杂O和0.49 at%的超高含量。当用作超级电容器的电极材料时,制备的多孔碳表现出出色的比电容和能量密度以及出色的循环稳定性。在0.5 A / g的电流密度下,基于这种材料的电极显示出530 F / g的高比电容,在20 A / g时具有258 F / g的极高速率性能,以及对于91%的电容保持出色的循环稳定性在6 M KOH中的三电极系统中以10 A / g进行10,000个循环。在组装好的超级电容器中,SF-PC 700-3基电极在1 V的电势下工作,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,其比电容仍可高达168 F / g,证明了SF-PC 700-3的出色性能。Na 2 SO 4和TEABF 4 / AN电解质中的对称超级电容器分别显示电压范围为1.8 V和3 V,在448时具有22.2 Wh Kg -1的高能量密度。在755.8 W时,W Kg -1和40.6 Wh Kg -1获得Kg -1。