The development of advanced anode materials for supercapacitors is crucial for driving innovation in the field of new energy technologies. Although iron-based materials show promise, their electrical conductivity and cyclic stability remain challenges. In this study, Fe₃O₄/FeS₂ composites were synthesized using a sacrificial MOF template and a solid-state sulfurization process. The composite retained the morphology of Fe-MOF, with numerous nanoscale particles formed through heterogeneous sulfurization. The SMFO-2 composite exhibited a specific capacity of 208.5 mAh g^-1 at a current density of 1 A g⁻¹. In a hybrid supercapacitor (HSC) constructed with SMFO-2 as the anode and super-electric activated carbon (AC) as the cathode, the device demonstrated a capacity retention rate of 78.6% after 10,000 cycles at 2 A g⁻¹. Furthermore, the HSC achieved an optimal energy density of 28.8 Wh kg⁻¹ with a power density of 375 W kg⁻¹, successfully powering a small bulb, highlighting its strong potential for practical applications.

中文翻译：

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MOF 模板硫化合成 Fe₃O₄/FeS₂ 复合材料用于高性能混合超级电容器


超级电容器用先进负极材料的开发对于推动新能源技术领域的创新至关重要。尽管铁基材料显示出前景，但其导电性和循环稳定性仍然存在挑战。在本研究中，使用牺牲 MOF 模板和固态硫化工艺合成了 Fe₃O₄/FeS₂ 复合材料。该复合材料保留了 Fe-MOF 的形态，通过非均相硫化形成了许多纳米级颗粒。SMFO-2 复合材料在 1Ag⁻¹ 的电流密度下表现出 208.5 mAh ^g-1 的比容量。在以 SMFO-2 为阳极，以超级电活性炭 （AC） 为阴极构建的混合超级电容器 （HSC） 中，该器件在 2Ag⁻¹ 下循环 10,000 次后表现出 78.6% 的容量保持率。此外，HSC 实现了 28.8Whkg⁻¹ 的最佳能量密度和 375Wkg⁻¹ 的功率密度，成功地为小型灯泡供电，凸显了其强大的实际应用潜力。