In this paper, Cu₂O-loaded S-doped worm-like hierarchical porous carbon flakes (SCu-HPCFs) have been prepared for supercapacitor applications by using cheap sweet potato starch as a raw material via a controlled carbonization–activation-hydrothermal reaction process. The as-prepared SCu-HPCFs possess hierarchical porous structure, large specific surface area (2543.68 m² g⁻¹), s doping state and good electrical conductivity. The SCu-HPCFs electrode exhibits a high specific capacitance of 451 F g⁻¹ at 1 A g⁻¹ and good rate capability (retention of 79% from 1 to 15 A g⁻¹). Moreover, the asymmetric supercapacitor assembled using the SCu-HPCFs as a negative electrode and NiO/RGO as a positive electrode shows a high energy density of 30.2 W h kg⁻¹ at a high power density of 800.4 W kg⁻¹ and can still achieve 23.5 W h kg⁻¹ at 8070.9 W kg⁻¹. At the same time, it has excellent cycling stability (90.8% retention after 10,000 cycles). The high capacity performance can be attributed to rich porous structure, high specific area and pore volume, Faraday contribution caused by S doping and the fast redox reaction of Cu₂O.

本文以廉价的甘薯淀粉为原料，通过控制碳化-活化-水热反应过程，制备了Cu ₂ O负载S掺杂蠕虫状多孔碳鳞片（SCu-HPCFs），用于超级电容器。 。所制备的SCu-HPCF具有分级的多孔结构，大的比表面积（2543.68m ² g ^-1），s掺杂态和良好的导电性。SCu-HPCFs电极在1 A g ^-1时表现出451 F g ^-1的高比电容和良好的倍率能力（从1到15 A g ^-1保留79％）。此外，使用SCu-HPCFs作为负极和NiO / RGO作为正极组装而成的非对称超级电容器在800.4 W kg ^-1的高功率密度下显示出30.2 W h kg ^-1的高能量密度，并且仍然可以实现23.5 W时千克^-1在8070.9W¯¯千克^-1。同时，它具有出色的循环稳定性（10,000次循环后保留90.8％）。高容量性能可归因于丰富的多孔结构，高比表面积和孔体积，S掺杂引起的法拉第贡献以及Cu ₂ O的快速氧化还原反应。