Presently, the porous carbon derived from natural biomass wastes hold a prominent position as electrode material in supercapacitors from its wonderful features of huge surface area, cost-effectiveness, freely available precursor, easy to preparation and eco-friendly nature. Thus, in the present study, we propose a new hollow tubular-like porous carbon (HT-PC) from the more sustainable and freely available feather finger grass flower (FFGF) with high electrochemical behavior as an active electrode for supercapacitors. The combination of carbonization and KOH activation treatments were carried out to prepare HT-PC from natural FFGF. The as-prepared biomass HT-PC containing the different sized micro-pore arrangement with a huge surface area (637.1 m² g⁻¹) after performed KOH activation treatment at the optimized condition. The three-electrode system measurements reveal that as-prepared HT-PC provides a remarkable specific capacitance of 315 F g⁻¹ at 1 A g⁻¹ and 262 F g⁻¹ at 100 A g⁻¹ with keeping 96% of capacitance over 50,000 cycles at 50 A g⁻¹ using 6 M KOH aqueous electrolyte. In addition to that, the HT-PC electrode-based symmetrical supercapacitor releases high specific energy of 18.75 Wh kg⁻¹ at 0.37 kW kg⁻¹ with losing 30% of capacitance over 10,000 cycles at 10 A g⁻¹ using 6 M KOH electrolyte. Meanwhile, the symmetrical supercapacitor shows a good specific energy of 13.18 Wh kg⁻¹ at 0.61 kW kg⁻¹ without losing any capacitance over 10,000 cycles at 10 A g⁻¹ using 1 M Et₄NBF₄/AN electrolyte. This study is verified that the naturally available FFGF is a talented sustainable carbon source to make more economical and effective carbon electrodes for supercapacitors.

目前，源自天然生物质废物的多孔碳由于其巨大的表面积，成本效益，可自由获得的前体，易于制备和生态友好的特性而在超级电容器中作为电极材料占据着突出的地位。因此，在本研究中，我们提出了一种新的中空管状多孔碳（HT-PC），它是由具有较高电化学行为的可持续性和可自由使用的羽毛指草花（FFGF）制成的，作为超级电容器的活性电极。进行碳化和KOH活化处理的组合以从天然FFGF制备HT-PC。所制备的生物质HT-PC包含不同尺寸的微孔结构，具有巨大的表面积（637.1 m ² g ^-1），然后在最佳条件下进行KOH活化处理。三电极系统测量结果表明，所制备的HT-PC在1 A g ^-1下提供了315 F g ^-1的显着比电容，在100 A g ^-1下提供了262 F g ^-1的显着比电容，并保持了96％的电容。使用6 M KOH水溶液在50 A g ^-1下进行50,000个循环。除此之外，基于HT-PC电极的对称超级电容器在0.37 kW kg ^-1时释放18.75 Wh kg ^-1的高比能，而在10 A g ^-1的10,000个循环中损失30％的电容使用6 M KOH电解质。同时，使用1 M Et ₄ NBF ₄ / AN电解质，对称超级电容器在0.61 kW kg ^-1时表现出13.18 Wh kg ^-1的良好比能，而在10 A g ^-1的10,000个循环中没有损失任何电容。这项研究证实，天然可用的FFGF是一种有才华的可持续碳源，可为超级电容器制造更经济和有效的碳电极。