Two hierarchical structures were designed using Fe₃O₄ as a core and ZIF-8 or ZIF-67 as a support. Fe₃O₄@ZIF-8 and Fe₃O₄@ZIF-67 were prepared through a facial one-step solvothermal method at room temperature. Results confirmed the microporous and mesoporous morphology of Fe₃O₄@ZIF-8 and Fe₃O₄@ZIF-67 nanoparticles. The porous structure of ZIF combined with Fe₃O₄ causes the composite electrode to have a short ion diffusion path, fast ion/electron transfer with maximized use of active material, resulting in high specific capacitance. Electrochemical efficiency of the sample was studied in 6 M KOH electrolyte using cyclic voltammetry, chronopotentiometry, and electrochemical impedance spectroscopy techniques. Results implied that Fe₃O₄@ZIF-8 and Fe₃O₄@ZIF-67 demonstrate maximum specific capacitance of 870 and 1334 F/g, respectively, at 1 A/g. In addition, an asymmetric device was fabricated using Fe₃O₄@ZIF-67 as a promising electrode, and active carbon as negative electrode. Fe₃O₄@ZIF-67//AC delivered a high-energy density of 27.9 W h/kg and power density of 5488 W/kg, as well as good cyclability with 87% of initial capacitance retained after 3000 consecutive charge/discharge rounds.

以Fe ₃ O ₄为核心，ZIF-8或ZIF-67为载体，设计了两种分层结构。通过在室温下通过面部一步溶剂热法制备Fe ₃ O ₄ @ ZIF-8和Fe ₃ O ₄ @ ZIF-67。结果证实了Fe ₃ O ₄ @ ZIF-8和Fe ₃ O ₄ @ ZIF-67纳米粒子的微孔和中孔形态。ZIF与Fe ₃ O ₄结合的多孔结构导致复合电极具有短的离子扩散路径，快速的离子/电子转移以及活性物质的最大化使用，从而导致高比电容。使用循环伏安法，计时电位法和电化学阻抗谱技术，在6 M KOH电解质中研究了样品的电化学效率。结果表明，Fe ₃ O ₄ @ ZIF-8和Fe ₃ O ₄ @ ZIF-67在1 A / g时显示出的最大比电容分别为870和1334 F / g。此外，使用Fe ₃ O ₄ @ ZIF-67作为有希望的电极，并使用活性炭作为负极，制造了一种不对称器件。铁₃ O ₄@ ZIF-67 // AC提供了27.9 W h / kg的高能量密度和5488 W / kg的功率密度，以及良好的可循环性，经过3000次连续充电/放电后保留了87％的初始电容。