Carbon nanotube (CNT)-incorporated nanoporous carbon (NPC) derived from the waste coffee ground composite was proposed as a potential electrode material for electrochemical double layer supercapacitors with an organic electrolyte. CNT-incorporated NPC pastes with different CNT contents were fabricated via a simple ball-milling method and then coated on a carbon nanofiber paper using a doctor blade technique. According to structural characterization data, the 3%CNT/NPC material offered a high specific surface area of 1157.8 m² g⁻¹ with a small average pore diameter of 1.42 nm owing to the intercalation of CNT structures between the NPC flakes. From electrochemical measurements, a coin cell using 3%CNT/NPC in 1 M TEABF₄/ACN exhibited a high specific capacitance of 132 Fg⁻¹ and a high specific energy of 37.7 Wh kg⁻¹ at 0.5 Ag⁻¹, which are considerably higher than those using NPC (74 Fg⁻¹ and 20.1 Wh kg⁻¹) and CNT (48 Fg⁻¹ and 14.7 Wh kg⁻¹). In addition, the composite possessed higher rate capability, better cycling stability, and lower self-discharge rate compared with NPC and CNT electrodes. Hence, the 3%CNT/NPC composite was promising as an active material for producing advanced supercapacitors.

来自废咖啡粉复合材料的碳纳米管 (CNT) 结合纳米多孔碳 (NPC) 被提议作为具有有机电解质的电化学双层超级电容器的潜在电极材料。通过简单的球磨法制备具有不同 CNT 含量的 CNT 并入 NPC 糊剂，然后使用刮刀技术将其涂覆在碳纳米纤维纸上。根据结构表征数据，3% CNT/NPC 材料提供了 1157.8 m ² g ^-1的高比表面积和 1.42 nm 的小平均孔径，这是由于 NPC 薄片之间插入了 CNT 结构。根据电化学测量，在 1 M TEABF _{4 中}使用 3% CNT/NPC 的纽扣电池/ACN在 0.5 Ag ^{-1 时}表现出 132 Fg ^-1的高比电容和 37.7 Wh kg ^-1的高比能，这远高于使用 NPC（74 Fg ^-1和 20.1 Wh kg ^-1）的比容量和CNT（48 Fg ^-1和14.7 Wh kg ^-1）。此外，与NPC和CNT电极相比，该复合材料具有更高的倍率性能、更好的循环稳定性和更低的自放电率。因此，3% CNT/NPC 复合材料有望作为生产先进超级电容器的活性材料。