The porous activated carbon material was prepared using hemp straw as the biomass carbon source, which was used as the substrate material to synthesize Fe₂O₃/porous carbon nanocomposites (Fe₂O₃/HAC) by simple and effective hydrothermal method. The results show that the porous activated carbon based on hemp straw is an ideal substrate for Fe₂O₃, which can effectively avoid the agglomeration of metal oxides, increase the contact area with electrolyte, and shorten the ion diffusion path, so as to improve the electrochemical performance of the material. In three-electrode system, the electrochemical performance of Fe₂O₃/HAC is much higher than that of HAC and Fe₂O₃ alone. At the current density of 1 A g⁻¹, its specific capacitance is 256 F g⁻¹, and it has the best capacity retention. The symmetrical device composed of the material has a good capacitance value and excellent cycle stability.

中文翻译：

---

超级电容器电极材料用Fe 2 O 3 /麻草基多孔碳复合材料

以麻秆为生物质碳源制备了多孔活性炭材料，以其为载体，通过简单有效的水热法合成Fe ₂ O ₃ /多孔碳纳米复合材料（Fe ₂ O ₃ / HAC）。结果表明，以麻草为基的多孔活性炭是Fe ₂ O ₃的理想基质，可有效避免金属氧化物的团聚，增加与电解质的接触面积，缩短离子扩散路径，从而改善材料的电化学性能。在三电极系统中，Fe ₂ O ₃的电化学性能/ HAC比单独的HAC和Fe ₂ O ₃高得多。在1 A g ^-1的电流密度下，其比电容为256 F g ^-1，并且具有最佳的容量保持率。由该材料组成的对称装置具有良好的电容值和优异的循环稳定性。