Cost-effective and sustainable high-performance supercapacitor material was successfully prepared from cellulosic waste (Sapindus trifoliatus nut shells) biomass-derived activated carbon (CBAC) by physical activation method. The CBAC displays nanofiber morphology, high specific surface area (786 m²/g), large pore volume (0.212 cm³ g⁻¹) which are evaluated using FESEM, BET and possessed excellent electrochemical behavior analyzed through various electrochemical methods. Moreover, the assembled symmetric CBAC//CBAC device exhibits high specific capacitance of 240.8 F g⁻¹ with current density of 0.2 A g⁻¹ and it is maintained to 65.6 F g⁻¹ at high current density of 2.0 A g⁻¹. In addition, the symmetric device delivers an excellent specific energy maximum of over 30 Wh kg⁻¹ at 400 W kg⁻¹ of specific power and excellent cycling stability in long term over 5000 cycles. The operation of the device was tested by light-emitting diode. Hence, CBAC-based materials pave way for developing large-scale, low-cost materials for energy storage device applications.

通过物理活化法成功地从纤维素废料（无壳果坚果壳）生物质衍生的活性炭（CBAC）中制备了具有成本效益和可持续发展的高性能超级电容器材料。CBAC表现出纳米纤维形态，高比表面积（786 m ² / g），大孔体积（0.212 cm ³  g ^-1），使用FESEM，BET进行评估，并具有通过各种电化学方法分析得到的优异的电化学行为。此外，组装的对称CBAC // CBAC器件在电流密度为0.2 A g ^-1时表现出240.8 F g ^-1的高比电容，并保持在65.6 F g ^{-1的水平。}在2.0 A g ^-1的高电流密度下。此外，该对称器件在400 W kg ^-1的比功率下可提供超过30 Wh kg ^-1的出色比能量最大值，并在超过5000次循环的长期中具有出色的循环稳定性。通过发光二极管测试该设备的操作。因此，基于CBAC的材料为开发用于能量存储设备应用的大规模，低成本材料铺平了道路。