College of Chemistry & Chemical Engineering, Research Institute of Comprehensive Energy Industry Technology, Yan'an University, Yan'an 716000, Shaanxi, China; Xingfa School of Mining Engineering, Wuhan Institute of Technology, Wuhan 430073, Hubei, China.
College of Chemistry & Chemical Engineering, Research Institute of Comprehensive Energy Industry Technology, Yan'an University, Yan'an 716000, Shaanxi, China.
J Colloid Interface Sci. 2023 Sep 15;646:228-237. doi: 10.1016/j.jcis.2023.04.179. Epub 2023 May 6.
The compact carbon materials with huge specific surface area (SSA) and proper pore structure are highly desirable towards high-performance supercapacitors at the cell level. However, to well balance of porosity and density is still an on-going task. Herein, a universal and facile strategy of pre-oxidation-carbonization-activation is employed to prepare the dense microporous carbons from coal tar pitch. The optimized sample POCA800 not only possesses a well-developed porous structure with the SSA of 2142 m g and total pore volume (V) of 1.540 cm g, but also exhibits a high packing density of 0.58 g cm and proper graphitization. Owing to these advantages, POCA800 electrode at areal mass loading of 10 mg cm shows a high specific capacitance of 300.8 F g (174.5 F cm) at 0.5 A g and good rate performance. The POCA800 based symmetrical supercapacitor with a total mass loading of 20 mg cm displays a large energy density of 8.07 Wh kg at 125 W kg and remarkable cycling durability. It is revealed that the prepared density microporous carbons are promising for practical applications.
具有大比表面积（SSA）和适当孔结构的紧凑碳材料对于在电池级别实现高性能超级电容器是非常理想的。然而，如何很好地平衡孔隙率和密度仍然是一个持续的任务。在此，我们采用了一种通用且简便的预氧化-碳化-活化策略，从煤焦油沥青中制备出高密度微孔碳。优化后的样品 POCA800 不仅具有发达的多孔结构，比表面积为 2142 m²/g，总孔体积（V）为 1.540 cm³/g，而且还具有较高的堆积密度（0.58 g/cm³）和适当的石墨化程度。由于这些优点，在面载量为 10 mg/cm 的情况下，POCA800 电极在 0.5 A/g 的电流密度下表现出 300.8 F/g（174.5 F/cm）的高比电容和良好的倍率性能。基于 POCA800 的对称超级电容器在总面载量为 20 mg/cm 时，在 125 W/kg 的功率密度下显示出 8.07 Wh/kg 的高能量密度和出色的循环耐久性。研究表明，所制备的高密度微孔碳在实际应用中具有广阔的应用前景。
