Improving electrode conductivity and increasing electrode specific surface area are two strategies to enhance the storage performance of supercapacitors. Generally, to improve the conductivity of the electrode, a conductive polymer is usually coated on electrode. Nevertheless, polymer covers the pore structure, thus reduce the specific surface area of electrode material, which is not conducive to electrolyte contact and electron transfer. Therefore, the selenide nanosheet layer can be precipitated from the outer layer of CoFe₂O₄ nanosheet by means of selenation reaction, which can not only increase conductivity of electrode, but also increase the specific surface area of electrode, which can kill two things with one stone. So, the as-prepared CoFe₂O₄/CoFe₂Se₄ porous nanosheet electrode as the positive electrode shows an outstanding specific capacity of 933.6 C g⁻¹ (1 A g⁻¹). The device operating voltage of an aqueous asymmetric supercapacitor is 1.6 V, the energy density is 112.2 Wh kg⁻¹ (power density of 400 W kg⁻¹). The aqueous asymmetric supercapacitor has good cycle life, after 4000 cycles the capacity retention is 92.1%. Based on the discussion of charging time and charging current of mechanical energy charging supercapacitor, a satisfactory result is obtained, which is beneficial to the collection and utilization of mechanical energy in practical application.

改善电极电导率和增加电极比表面积是提高超级电容器存储性能的两种策略。通常，为了提高电极的电导率，通常将导电聚合物涂覆在电极上。然而，聚合物覆盖了孔结构，因此减小了电极材料的比表面积，这不利于电解质接触和电子转移。因此，硒化纳米片层可以通过硒化反应从CoFe ₂ O ₄纳米片的外层中析出，这不仅可以增加电极的电导率，而且可以增加电极的比表面积，这可以杀死两件事。一块石头。因此，所制备的CoFe ₂ O作为正极的₄ / CoFe ₂ Se ₄多孔纳米片电极显示出优异的比容量为933.6 C g ^-1（1 A g ^-1）。水性非对称超级电容器的器件工作电压为1.6 V，能量密度为112.2 Wh kg ^-1（功率密度为400 W kg ^-1）。水性不对称超级电容器具有良好的循环寿命，经过4000次循环后，容量保持率为92.1％。通过对机械能充电超级电容器的充电时间和充电电流的讨论，获得了满意的结果，有利于实际应用中机械能的收集和利用。