Electrode materials with high conductivities that are compatible with flexible substrates are important for preparing high-capacitance electrode materials and improving the energy density of flexible supercapacitors. Here, we report the design and fabrication of a new type of flexible electrode based on nanosheet architectures of a Co–Fe alloy (FeCo-A) coated with ternary metal sulfide composites (FeCo-Ss) on silver-sputtered carbon cloth. The high conductivity of the flexible substrate and the iron–cobalt alloy skeleton enables good electron transmission through the material. In particular, the outer FeCo-S layer has an average thickness of ∼30 nm, providing many active sites. This layer also inhibits the oxidation of the alloy. The electrode material is close to 20 nm thick, which limits inaccessible volumes and promotes high utilization of FeCo-alloy@FeCo-sulfide (FeCo-A-S). The additive-free FeCo-A-S electrode has a high specific capacitance of 2932.2 F g^–1 at 1.0 A g^–1 and a superior rate capability. All-solid-state supercapacitors based on these electrodes have a high power density of 8000 W kg^–1 and a high energy density of 46.1 W h kg^–1.

中文翻译：

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基于铁钴合金@硫化物的非对称柔性超级电容器具有高能量和功率密度

与柔性基板兼容的具有高电导率的电极材料对于制备高电容电极材料和提高柔性超级电容器的能量密度具有重要意义。在这里，我们报告了基于 Co-Fe 合金 (FeCo-A) 纳米片结构的新型柔性电极的设计和制造，该合金在银溅射碳布上涂有三元金属硫化物复合材料 (FeCo-Ss)。柔性基板和铁钴合金骨架的高导电性使电子能够通过材料进行良好的传输。特别是，FeCo-S 外层的平均厚度约为 30 nm，提供了许多活性位点。该层还抑制合金的氧化。电极材料接近 20 nm 厚，这限制了难以接近的体积并促进了 FeCo-alloy@FeCo-硫化物 (FeCo-AS) 的高利用率。无添加剂的 FeCo-AS 电极具有 2932.2 F g 的高比电容^–1 at 1.0 A g ^–1和优异的倍率能力。基于这些电极的全固态超级电容器具有 8000 W kg ^–1的高功率密度和 46.1 W h kg ^–1的高能量密度。