Abstract Herein, we have proposed asymmetric supercapacitor device to achieve empirical electrochemical performance based on binder-free Co 9 S 8 and CoFe 2 O 4 electrodes. The unique architecture and porous surface of the prepared electrodes were analyzed using electron microscopy and Brunauer–Emmett–Teller technique. Electrochemical properties of Co 9 S 8 and CoFe 2 O 4 electrode were employed in a three-electrode cell-configuration that exhibits a capacitance of 817 and 1203 F g −1 , respectively. Co 9 S 8 //CoFe 2 O 4 asymmetric supercapacitor reveals a high capacitance of 79.11 F g −1 with 28.88 Wh kg −1 energy density and superior cyclic stability over 2500 cycles (∼87%). These results suggest that prepared electrodes have a great potential for practical applications.

中文翻译：

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实现用于非对称超级电容器的 Co 9 S 8 //CoFe 2 O 4 的高性能独特微结构

摘要 在此，我们提出了基于无粘合剂 Co 9 S 8 和 CoFe 2 O 4 电极的非对称超级电容器装置，以实现经验电化学性能。使用电子显微镜和 Brunauer-Emmett-Teller 技术分析了所制备电极的独特结构和多孔表面。Co 9 S 8 和CoFe 2 O 4 电极的电化学特性被用于三电极电池配置中，其电容分别为817和1203 F g -1 。Co 9 S 8 //CoFe 2 O 4 不对称超级电容器显示出79.11 F g -1 的高电容，28.88 Wh kg -1 能量密度和超过2500次循环（~87%）的优异循环稳定性。这些结果表明制备的电极具有很大的实际应用潜力。