In this study, cost‐effective hierarchically porous carbon (HPC) derived from starch was successfully prepared through a simple mixing and subsequent one‐step carbonization method. Based on the three‐dimensional interconnected hierarchically porous structure, HPC exhibits a high specific surface area of 2259.54 m² g⁻¹ and a specific capacitance of 385.7 F g⁻¹ at 1 A g⁻¹ in a three‐electrode system. When the as‐prepared carbon was employed to fabricate an aqueous symmetrical supercapacitor, the device displayed a high specific capacitance of 81.3 F g⁻¹ at 1 A g⁻¹, and even at 20 A g⁻¹ the specific capacitance remained 64 F g⁻¹ (capacity retention rate of 78.72 % compares with that at 1 A g⁻¹), demonstrating an outstanding rate performance. This supercapacitor maintained a capacity retention of 100 % after 60 000 cycles at a current density of 5 A g⁻¹, indicating superior long‐term cycling stability. Furthermore, when the as‐prepared carbon was employed to fabricate a symmetrical supercapacitor in ionic liquid (1‐ethyl‐3‐methylimidazolium tetrafluoroborate, EMIMBF₄) electrolyte, it ultimately achieved an ultrahigh energy density of 133.94 Wh kg⁻¹ (power density of 1997.51 W kg⁻¹) and a capacity retention rate of 83.3 % was maintained after 5000 cycles throughout a wide operating potential window of 0–4 V at 10 A g⁻¹.

中文翻译：

---

分层多孔碳作为高性能超级电容器的高寿命长寿命电极材料

在这项研究中，通过简单的混合和随后的一步碳化方法成功地制备了具有成本效益的淀粉衍生的分级多孔碳（HPC）。基于三维互连的分层多孔结构，在三电极系统中，HPC在1 A g ^-1时具有2259.54 m ²  g ^-1的高比表面积和385.7 F g ^-1的比电容。当使用所制备的碳制造水性对称超级电容器时，该器件在1 A g ^-1时显示出81.3 F g ^-1的高比电容，甚至在20 A g ^-1时仍保持64 F g的比电容。^-1（与1 A g ^-1相比，容量保持率为78.72％），显示出出色的速率性能。该超级电容器在60 000次循环后，在5 A g ^-1的电流密度下仍保持100％的容量保持率，表明其优异的长期循环稳定性。此外，当使用所制备的碳在离子液体（1-乙基-3-甲基咪唑鎓四氟硼酸酯，EMIMBF ₄）电解质中制造对称超级电容器时，最终实现了133.94 Wh kg ^-1的超高能量密度（功率密度为在10 A g ^-1的0-4 V的宽工作电势窗口中，经过5000次循环后，在1997年5月¹日的功率密度（1997.51 W kg ^-1）和容量保持率83.3％的情况下得以保持。