Abstract Bimetal sulfide nanoparticle synthesized via a facile hydrothermal method using hybrid zeolitic imidazolate framework (ZIF-Co.Zn) and the made composites were analyzed using Field emission scanning electron microscopy (FESEM), Fourier-transform infrared spectroscopy (FTIR), X-ray diffraction (XRD) and Brunauer, Emmett, and Teller (BET) analysis. In addition, the electrode materials were electrochemically assessed through galvanostatic charge-discharge (GCD), cyclic voltammetry (CV), and electrochemical impedance spectroscopy (EIS) methods in 6 M KOH electrolyte. Because of the synergistic impact of sulfur and metal, the prepared specimens showed excellent performance. Here, Zn-Co-S exhibited a high specific capacitance of 1646 F/g at 1 A/g current density. Furthermore, in our study, an asymmetric supercapacitor was developed successfully where active carbon and Zn-Co-S served as negative and positive electrodes, respectively. In the asymmetric device, a power density of 7080 W/kg and an energy density of 39.41 Wh/kg can be delivered with an 89 % capacitance retention followed by 2000 charge-discharge cycles. The results showed that the MOF-derived bimetal sulfide composite can be a promising candidate for the advanced electrode materials in supercapacitor applications.

中文翻译：

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混合 ZIF 衍生的二元 ZnS/CoS 复合材料的合成作为高面电容超级电容器

摘要 使用混合沸石咪唑酯骨架 (ZIF-Co.Zn) 通过简便的水热法合成了双金属硫化物纳米粒子，并使用场发射扫描电子显微镜 (FESEM)、傅里叶变换红外光谱 (FTIR)、X 射线分析了制备的复合材料。衍射 (XRD) 和 Brunauer、Emmett 和 Teller (BET) 分析。此外，通过恒电流充放电 (GCD)、循环伏安法 (CV) 和电化学阻抗谱 (EIS) 方法在 6 M KOH 电解质中对电极材料进行了电化学评估。由于硫和金属的协同作用，制备的试样表现出优异的性能。在这里，Zn-Co-S 在 1 A/g 电流密度下表现出 1646 F/g 的高比电容。此外，在我们的研究中，成功开发了一种不对称超级电容器，其中活性炭和 Zn-Co-S 分别用作负极和正极。在非对称器件中，可提供 7080 W/kg 的功率密度和 39.41 Wh/kg 的能量密度，并在 2000 次充放电循环后提供 89% 的电容保持率。结果表明，MOF 衍生的双金属硫化物复合材料可以成为超级电容器应用中先进电极材料的有希望的候选者。