The 3D interconnected architecture nanowires of Co₃O₄ partially substituted by Cu(I)/Cu(II) coated on the carbon cloth (CCO@CC) with high specific surface area were fabricated by a facile and low-cost hydrothermal approach and consequent thermal annealing. The prepared binder-free CCO@CC electrode exhibits high specific capacitance (1947.2 F g⁻¹ or 973.6 C g⁻¹ at 1 A g⁻¹) and superior cyclic stability (93.76% retention of initial value up to 10,000 cycles). In addition, the CCO@CC and synthesized Fe₂O₃@CC are used as positive and negative electrodes in the presence of PVA-KOH as a gel electrolyte to assemble a flexible solid-state asymmetric supercapacitor. The as-assembled flexible device shows a high specific capacitance of 182.7 F g⁻¹, high energy density of 57.1 W h kg⁻¹ at the power density of 749.75 W kg⁻¹, remarkable cyclic stability with 93.25% retention after 10,000 cycles and almost no capacity loss under different bending angles. Therefore, this material has potential application for wearable electronics with the excellent mechanical flexibility.

通过一种简便，低成本的水热方法，制备了包覆有高比表面积的碳布（CCO @ CC）上被Cu（I）/ Cu（II）部分取代的Co ₃ O ₄的3D互连结构纳米线，从而实现了热退火。所制备的粘合剂-自由CCO @ CC电极表现出高的比电容（1947.2 F G ^-1或973.6 C g还^-1 1 A G ^-1）和优异的循环稳定性（初始值高达93.76％的保留至10,000次循环）。此外，CCO @ CC和合成的Fe ₂ O ₃在PVA-KOH作为凝胶电解质存在的情况下，@ CC用作正电极和负电极，以组装柔性固态不对称超级电容器。组装后的柔性器件显示出182.7 F g ^-1的高比电容，在749.75 W kg ^-1的功率密度下的57.1 W h kg ^-1的高能量密度，显着的循环稳定性以及在10,000次循环后保持93.25％的稳定性。在不同的弯曲角度下几乎没有容量损失。因此，这种材料具有优异的机械柔韧性，可用于可穿戴电子产品。