The exploration of high-performance supercapacitors (SCs) has attracted wide attention worldwide. Herein, iron cobalt oxide (FeCo₂O₄) nanocomposites were prepared by using soft-template and hydrothermal method. The prepared FeCo₂O₄ electrode material presented good dispersivity and had different flower-like structures and flocculent structures, which exhibited high capacitance and cyclic stability. Specially, the FeCo₂O₄ electrode with the usage of 0.5 g polyvinylpyrrolidone (PVP), sodium dodecyl sulfate (SDS), cetyltrimethylammonium bromide (CTAB), and none template agents showed high capacitance of 1231.1, 956.2, 1027.8, and 677.3 F g⁻¹ at 1 A g⁻¹. Furthermore, we used an optimized FeCo₂O₄ electrode material as the positive electrode, activated carbon (AC) as the negative electrode, and 6 M KOH solution as the electrolyte to assemble an asymmetric supercapacitor (ASC). The resulting ASC device exhibits a favorable energy density of 51.2 Wh kg⁻¹ and a high power density of 775.4 W kg⁻¹.

中文翻译：

---

用软模板和简单的水热法在泡沫镍上合成Fe-Co氧化物并将其应用于超级电容器

高性能超级电容器（SC）的探索已引起全世界的广泛关注。本文采用软模板法和水热法制备了钴酸铁（FeCo ₂ O ₄）纳米复合材料。制备的FeCo ₂ O ₄电极材料具有良好的分散性，并具有不同的花状结构和絮状结构，具有较高的电容量和循环稳定性。特别是，使用0.5 g聚乙烯吡咯烷酮（PVP），十二烷基硫酸钠（SDS），十六烷基三甲基溴化铵（CTAB）的FeCo ₂ O ₄电极，没有一种模板剂显示1231.1、956.2、1027.8和677.3 F g的高电容^-1在1 A g^-1。此外，我们使用优化的FeCo ₂ O ₄电极材料作为正电极，使用活性炭（AC）作为负电极，并使用6 M KOH溶液作为电解质来组装不对称超级电容器（ASC）。所得的ASC装置表现出51.2 Wh kg ^-1的有利能量密度和775.4 W kg ^-1的高功率密度。