Abstract Porous activated carbon material is successfully prepared with anthracite through KOH activation. The obtained activated carbon delivers a large specific surface area of 3550.7 m2 g-1 with existence of porous structure. The KOH activation introduces numerous hydroxyl groups on the surface of carbon material, improving the wettability of carbon. As electrode for supercapacitor, the material delivers the high specific capacity of 433 F g-1 at the current density of 0.5 A g-1 and it maintains 230 F g-1 even current density reaches up to 50 A g-1. Especially, as electrode for symmetric capacitor, the porous activated carbon exhibits a high specific capacitance of 280 F g-1 and energy density of 38.9 Wh kg-1 at 0.5 A g-1. The material also displays superior cyclic stability without distinct decay in capacity after 30000 cycles. The porous activated carbon material derived from coal, which embodies characteristics of capacitance behavior, may broaden the horizon of electrode materials and provide application prospect for specialized hybrid supercapacitor applications.

中文翻译：

---

具有超高比表面积和优异电化学性能的煤衍生多孔活性炭用于超级电容器

摘要 以无烟煤为原料，通过KOH活化成功制备了多孔活性炭材料。获得的活性炭具有3550.7 m2 g-1的大比表面积，并具有多孔结构。KOH活化在碳材料表面引入了大量羟基，提高了碳的润湿性。作为超级电容器的电极，该材料在 0.5 A g-1 的电流密度下可提供 433 F g-1 的高比容量，并且即使电流密度达到 50 A g-1 也能保持 230 F g-1。特别是，作为对称电容器的电极，多孔活性炭在 0.5 A g-1 下表现出 280 F g-1 的高比电容和 38.9 Wh kg-1 的能量密度。该材料还显示出优异的循环稳定性，在 30000 次循环后容量没有明显衰减。