The novel structure of electrode materials with high conductivity, large specific surface area and ultra-high energy density is urgently needed to achieve high performance energy storage. Here, a novel hierarchical CoFe₂Se₄@CoFe₂O₄ and CoFe₂S₄@CoFe₂O₄ core-shell nanoboxes electrode arrays with uniform size and morphology have been successfully deposited on nickel foam through a mild two-step hydrothermal method, which have been further developed as binder-free electrode materials for asymmetric supercapacitors, because of the core-shell structural advantage and multifunctionality of the CoFe₂Se₄@CoFe₂O₄ and CoFe₂S₄@CoFe₂O₄ nanoboxes. Moreover, the CoFe₂Se₄@CoFe₂O₄ electrode acquires an exceptional specific capacitance of 2040.8 F g⁻¹ at 1 A g⁻¹ and excellent rate performance, which is superior to other ternary transition metal sulfides. An asymmetric device with carbon nanotubes as negative electrode, CoFe₂Se₄@CoFe₂O₄ as positive electrode and 3M KOH as electrolyte also demonstrates a wide voltage of 1.6 V, a desirable specific capacitance (463.27 F g⁻¹ at 1 A g⁻¹), and a higher energy density of 164.72 Wh kg⁻¹ (at 508 W kg⁻¹) than other reports. Meanwhile, the CoFe₂Se₄@CoFe₂O₄//CNTs asymmetric supercapacitor can drive the toy car more than 15 m, indicating the CoFe₂Se₄@CoFe₂O₄ electrode own powerful energy storage capacity and application value.

为了实现高性能的能量存储，迫切需要具有高导电率，大的比表面积和超高能量密度的新型电极材料。在此，通过温和的两步水热法成功地在泡沫镍上成功沉积了具有均匀尺寸和形态的新型分层式CoFe ₂ Se ₄ @CoFe ₂ O ₄和CoFe ₂ S ₄ @CoFe ₂ O ₄核壳纳米盒电极阵列。由于CoFe ₂ Se的核壳结构优势和多功能性，已被进一步开发为不对称超级电容器的无粘合剂电极材料₄ @CoFe ₂ O ₄和CoFe ₂ S ₄ @CoFe ₂ O ₄纳米盒。此外，CoFe ₂ Se ₄ @CoFe ₂ O ₄电极在1 A g ^-1下具有2040.8 F g ^-1的比电容，并且具有出色的倍率性能，优于其他三元过渡金属硫化物。以碳纳米管为负极的不对称器件，CoFe ₂ Se ₄ @CoFe ₂ O ₄作为正极和3M KOH作为电解质还演示了1.6 V，理想的比电容值的宽电压（463.27 F G ^-1 1 A G ^-1），和164.72瓦公斤的更高的能量密度^-1（在508 w ^ kg ^-1）。同时，CoFe ₂ Se ₄ @CoFe ₂ O ₄ // CNTs不对称超级电容器可以驱动玩具车超过15 m，表明CoFe ₂ Se ₄ @CoFe ₂ O ₄电极具有强大的储能能力和应用价值。