One of the effective ways to improve the electrochemical performance of supercapacitors is to fabricate a combined electric double layer capacitor (EDLC)-pseudocapacitance system. In this study, we synthesized the composite material FeCo₂O₄@PC by hydrothermal method, which can enhance the electrochemical performance of supercapacitors by the synergetic effect of EDLC and pseudocapacitance mechanisms. A series of physical characterizations including X-ray diffractometer (XRD), X-ray photoelectron spectroscopy (XPS) and scanning electron microscope (SEM) were used to demonstrate the successful compositing of FeCo₂O₄@PC. And FeCo₂O₄@PC was used for the testing of supercapacitor and the electrochemical performance was evaluated by cyclic voltammetry (CV) and galvanostatic charge-discharge (GCD). The results show that the composite FeCo₂O₄@PC-5 possesses larger specific capacitance and excellent rate capability. This further confirms that the composite of the two materials can overcome their respective shortcomings and improve the overall capacitive performance of the electrode. The composite electrode material FeCo₂O₄@PC has great application potential and prospects in the field of supercapacitors.

提高超级电容器电化学性能的有效方法之一是制造组合双电层电容器（EDLC）-赝电容系统。在本研究中，我们通过水热法合成了复合材料FeCo ₂ O ₄ @PC，通过EDLC和赝电容机制的协同作用提高超级电容器的电化学性能。使用包括 X 射线衍射仪 (XRD)、X 射线光电子能谱 (XPS) 和扫描电子显微镜 (SEM) 在内的一系列物理表征来证明 FeCo ₂ O ₄ @PC 的成功合成。和FeCo ₂ O ₄@PC用于超级电容器的测试，通过循环伏安法（CV）和恒电流充放电（GCD）评估电化学性能。结果表明，复合FeCo ₂ O ₄ @PC-5具有较大的比电容和优异的倍率性能。这进一步证实了两种材料的复合可以克服各自的缺点，提高电极的整体电容性能。复合电极材料FeCo ₂ O ₄ @PC在超级电容器领域具有巨大的应用潜力和前景。