Regenerative graphene oxide (Re-GO) with two-dimensional loose structure is obtained from carbon rods of waste dry batteries by freeze-drying post-processing method. This not only reduces resource waste but also generates a new device for energy storage. Transition metal sulfides are in-situ grown on Re-GO surface as high-performance electrode material for supercapacitors. Facile synthesis of the three-dimensional nanoflower structure Re-GO@NiS₂ shows many excellent electrochemical properties, combining the stability of the carbon material and high specific capacitance of transition metal sulfides. The maximum specific capacitance is 1932.5 F•g⁻¹ at a current density of 1 A•g⁻¹ in a three-electrode system. Furthermore, as-assembled Re-GO@NiS₂//Re-GO assymmetric supercapacitor (ASC) exhibits the specific energy of 28.31 Wh•kg⁻¹ at specific power of 800 W•kg⁻¹. As a result, this work provides an effective route to dispose of waste dry battery and regenerate it for supercapacitor applications.

通过冻干后处理方法从废干电池的碳棒中获得二维疏松结构的再生氧化石墨烯（Re-GO）。这不仅减少了资源浪费，而且产生了一种新的能量存储设备。过渡金属硫化物在Re-GO表面上原位生长，作为超级电容器的高性能电极材料。三维纳米花结构Re-GO @ NiS _2的简便合成显示了许多出色的电化学性能，结合了碳材料的稳定性和过渡金属硫化物的高比电容。在三电极系统中，在1 A•g ^-1的电流密度下，最大比电容为1932.5 F•g ^-1。此外，组装后的Re-GO @ NiS ₂// Re-GO不对称超级电容器（ASC）在800 W•kg ^-1的比功率下表现出28.31 Wh•kg ^-1的比能。结果，这项工作提供了一种有效的途径来处理废干电池，并将其再生以用于超级电容器应用。