Key Laboratory of Eco-Environment-Related Polymer Materials of Ministry of Education, Key Laboratory of Polymer Materials of Gansu Province, College of Chemistry and Chemical Engineering, Northwest Normal University, Lanzhou, Gansu 730070, China.
Key Laboratory of Eco-Environment-Related Polymer Materials of Ministry of Education, Key Laboratory of Polymer Materials of Gansu Province, College of Chemistry and Chemical Engineering, Northwest Normal University, Lanzhou, Gansu 730070, China.
J Colloid Interface Sci. 2019 Mar 22;540:88-96. doi: 10.1016/j.jcis.2018.12.029. Epub 2018 Dec 8.
Here we report a simple, low-cost and environment friendly method, in which Black locust seed dregs and potassium ferrate (KFeO) are used as starting raw materials and activation agent. The hierarchically porous carbons (BDPC) with high special surface area and abundant mesopores (S = 2010.1 m g and V = 1.457 cm g) are obtained through hydrothermal treatment and chemical activation. The BDPC electrode exhibits excellent electrochemical performances by virtue of unique architecture and heteroatoms pseudocapacitance contribution. In the three-electrode system, the optimized carbon material (BDPC-2) achieves a high specific capacitance of 333 F g at 1 A g and displays the high rate capability (81.1% capacitance retention at 100 A g) in 6 M KOH electrolyte. The symmetric supercapacitor based BDPC-2 exhibits energy density as high as 26.2 Wh kg (at a power density of 0.79 kW kg) and excellent long-term cycling stability (only 8% decrease after 10,000 cycles) in 6 M KOH.
在这里，我们报告了一种简单、低成本且环保的方法，该方法以刺槐豆渣和高铁酸钾（KFeO）为起始原料和活化剂。通过水热处理和化学活化，得到了具有高比表面积和丰富中孔（S=2010.1 m²/g，V=1.457 cm³/g）的分级多孔碳（BDPC）。BDPC 电极具有独特的结构和杂原子赝电容贡献，表现出优异的电化学性能。在三电极系统中，优化后的碳材料（BDPC-2）在 1 A/g 时具有 333 F/g 的高比电容，在 6 M KOH 电解液中具有高倍率性能（100 A/g 时电容保持率为 81.1%）。基于 BDPC-2 的对称超级电容器在 6 M KOH 中具有高达 26.2 Wh/kg 的能量密度（在 0.79 kW/kg 的功率密度下）和出色的长期循环稳定性（经过 10000 次循环后仅下降 8%）。
